당신은 주제를 찾고 있습니까 “misfiring of cylinder 1 damages twc – Mercedes misfiring cylinder fix“? 다음 카테고리의 웹사이트 Chewathai27.com/you 에서 귀하의 모든 질문에 답변해 드립니다: Chewathai27.com/you/blog. 바로 아래에서 답을 찾을 수 있습니다. 작성자 sev sevy 이(가) 작성한 기사에는 조회수 29,827회 및 좋아요 211개 개의 좋아요가 있습니다.
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여기에서 이 주제에 대한 비디오를 시청하십시오. 주의 깊게 살펴보고 읽고 있는 내용에 대한 피드백을 제공하세요!
d여기에서 Mercedes misfiring cylinder fix – misfiring of cylinder 1 damages twc 주제에 대한 세부정보를 참조하세요
Have you got a misfiring cylinder on your petrol Mercedes? You have changed coils, spark plugs, cables and it still misfires? Usually cylinder 1 or 4. Watch this video.
misfiring of cylinder 1 damages twc 주제에 대한 자세한 내용은 여기를 참조하세요.
Misfiring of cylinder 1 : Damages TWC (P0301) – Mercedes-Benz
Test 2: Check component Y62y1 (Fuel injector cylinder 1). Test 3: Combustion misfirings 1. Check component T1/1 (ignition coil cylinder 1).
Source: mercedes-benz-worldzz.blogspot.com
Date Published: 1/11/2022
View: 9419
Misfiring of cylinder 1 : Damages TWC (P0301)
Do not touch any parts of the ignition system when starting the engine or when the engine is running. Wear protective shoes with rubber soles.
Source: oembrake.blogspot.com
Date Published: 12/7/2022
View: 3168
Cylinder misfire – MBWorld.org Forums
0633 Misfiring of cylinder 1: damages TWC (p0301) Anyone know what these codes are and what is the repair procedures?? Thanks for any help
Source: mbworld.org
Date Published: 1/7/2022
View: 7371
Fault code P201B-032 – Misfire on cylinder 3, damages TWC …
The diagnostics machine reports a fault P201B-032 (Misfiring of cylinder 3, Damages TWC fuel deficiency) on the ME-SFI section of it’s output.
Source: mercedesforum.com
Date Published: 4/21/2022
View: 6510
Resolved – Misfiring | Mercedes SLK World
2) 0633 – Misfiring of cylinder 1 : Damages TWC ( P0301) 3) 1015 – The control line to the ignition coil of cylinder 1 has an open circuit …
Source: www.slkworld.com
Date Published: 12/21/2021
View: 3706
P0301 – Meaning, Causes, Symptoms, & Fixes – FIXD
What Does Code P0301 Mean? · P0301 definition: Cylinder 1 misfire detected. · Issue Severity: SEVERE – Stop driving immediately · Repair Urgency: …
Source: www.fixdapp.com
Date Published: 8/4/2021
View: 4156
Mercedes Engine Misfire Problem – MB Medic
Engine misfires are one of the most common problems we see in many Mercedes-Benz cars. … P0300 Random/Multiple Cylinder Misfire Detected.
Source: www.mercedesmedic.com
Date Published: 6/28/2021
View: 174
coil pack issue? | Mercedes-Benz Forum – BenzWorld.org
P2050 Misfiring, damages TWC (P0300) fault indicator lamp on. Code 002: P2051 Misfiring of cylinder 1, damages TWC (P0301) fault indicator …
Source: www.benzworld.org
Date Published: 5/12/2021
View: 6592
Misfiring on several cylinders simultaneously
1. Function group. 15.18 Cable sets. Date. 08-21-2013. Vality. Model 215, 216, 220, 221, … Misfiring of cylinder 8, damages TWC(P0308).
Source: f01.justanswer.com
Date Published: 6/28/2022
View: 2197
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주제와 관련된 더 많은 사진을 참조하십시오 Mercedes misfiring cylinder fix. 댓글에서 더 많은 관련 이미지를 보거나 필요한 경우 더 많은 관련 기사를 볼 수 있습니다.
주제에 대한 기사 평가 misfiring of cylinder 1 damages twc
- Author: sev sevy
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- Date Published: 2018. 11. 26.
- Video Url link: https://www.youtube.com/watch?v=Ggtb1bm9-x4
Mercedes-Benz: Misfiring of cylinder 1 : Damages TWC (P0301)
Misfiring of cylinder 1 : Damages TWC (P0301)
Misfiring of cylinder 1 : Damages TWC (P0301)
Possible cause:
Combustion misfirings
Affected functions:
Engine diagnosis
Engine running
Test 1: Check component T1/1 (ignition coil cylinder 1).
Copyright ? 2013, ALLDATA
10.52SS
Page 5542010 Mercedes Benz E 63 AMG Sedan (212.077) V86.3L (156.985)
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Page 555
Test 2: Check component Y62y1 (Fuel injector cylinder 1).
Test 3: Combustion misfirings
1. Check component T1/1 (ignition coil cylinder 1).
Warning!Hazard as a result of high voltage at the ignition system!
Electronic ignition systems operate within a hazardous power range both at the low voltage side (primary circuit) as well as on the
high voltage side (secondary circuit).
Contacts with such parts can result in burns, heart flutter or cardiac arrest.
Rules of conduct and protective measures
Persons with heart pacemakers must not perform any work on the ignition system.
Switch off the ignition when performing work on the ignition system.
Do not touch any parts of the ignition system when starting the engine or when the engine is running.
Wear protective shoes with rubber soles.
Do not install any uninsulated adapters into the ignition cables.
1. No further information available.
2. Check component Y62y1 (Fuel injector cylinder 1).
Safety note
Warning!Risk of explosion, poisoning and injury!Fuels are highly inflammable and toxic if inhaled. Fuels may cause skin damage. fuel
vapors are explosive, invisible and spread out at floor level, they are toxic if inhaled and produce giddiness and an anaesthetizing
effect.Rules of conduct and protective measures
Wear suitable protective clothing.
Pay attention to national safety precautions and regulations.
No fire, sparks, naked flames and smoking.
Ensure the work place is adequately ventilated.
Never drain or pour in fuels over assembly pits.
Store drained fuel in a suitable and sealed vessel.
Immediately eliminate any fuel which has flowed out.
Firstaid measures
Clean moistened skin with water and soap.
Change moistened clothing as quickly as possible.
If fuel gets into your eyes, rinse out your eyes immediately with water and contact a doctor if necessary.
Test 2.1: Test actuation of component Y62y1 (Fuel injector cylinder 1).
Test 2.2: Test signal voltage of component Y62y1 (Fuel injector cylinder 1).
Test 2.3: Check internal resistance of component Y62y1 (Fuel injector cylinder 1).
Test 2.4: Inspect component Y62y1 (Fuel injector cylinder 1) for leaks.
Test 2.5: Inspect operation and spray pattern of component Y62y1 (Fuel injector cylinder 1).
2.1. Test actuation of component Y62y1 (Fuel injector cylinder 1).
Test prerequisite
Coolant temperature > 80? C
Engine RUNNING
Warning!Communication with ECU required.
2.2. Test signal voltage of component Y62y1 (Fuel injector cylinder 1).
Figure legend2010 Mercedes Benz E 63 AMG Sedan (212.077) V86.3L (156.985)
Copyright ? 2013, ALLDATA
10.52SS
A ConnectionTest cable 35pin socket box
001 Sockets of component N3/10 (MESFI [ME] control unit)
05 35pin socket box
050 126pin socket box
108 Test cable 266 589 01 63 00
N3/10 (MESFI [ME] control unit)
II 163ConnectionTest cable
III 64126ConnectionTest cable
Warning!
Connection A of test cable 108 may NOT be connected to connection B of the 126pin socket box (050).
Test sequence
Note
Switch off ignition.
ConnectionMeasuring system
Observe oscilloscope pattern between sockets [M.23] 23 and [F.3] 99 of the 126pole socket box tester.
Run engine.
Measuring system:Communication with ECU required
2.3. Check internal resistance of component Y62y1 (Fuel injector cylinder 1).
Figure legend
A ConnectionTest cable 35pin socket box
001 Sockets of component N3/10 (MESFI [ME] control unit)
05 35pin socket box
050 126pin socket box
108 Test cable 266 589 01 63 00
N3/10 (MESFI [ME] control unit)
II 163ConnectionTest cable
III 64126ConnectionTest cable
Warning!
Page 5562010 Mercedes Benz E 63 AMG Sedan (212.077) V86.3L (156.985)
Copyright ? 2013, ALLDATA
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Page 557
Connection A of test cable 108 may NOT be connected to connection B of the 126pin socket box (050).
Test sequence
Switch off ignition.
Connect socket box (126pin) to component N3/10 (MESFI [ME] control unit).
Measure resistance with multimeter between sockets [M.23] 23 and [F.3] 99 of the 126pole socket box tester.
Specified value
Resistor[11…17]ohms
Question
Is the measurement value OK?
YES
The measurement value is OK.Note
In the event of stored faults with a high fault frequency count or in the event of customer complaints, check lines and connectors
for loose contact and corrosion..
NO
The measurement value is not OK.Test sequence
Switch off ignition.
Connect shopmade test cable set to component Y62y1 (Fuel injector cylinder 1).
Measure resistance with multimeter between pins (Y62) 1 and (Y62) 2
Specified value
Resistor[11…13]ohms
Question
Is the measurement value OK?2010 Mercedes Benz E 63 AMG Sedan (212.077) V86.3L (156.985)
Copyright ? 2013, ALLDATA
10.52SS
YES
The measurement value is OK.Possible cause and remedy
Lines to component Y62y1 (Fuel injector cylinder 1)
NO
The measurement value is not OK.Possible cause and remedy
Y62y1 (Fuel injector cylinder 1)
2.4. Inspect component Y62y1 (Fuel injector cylinder 1) for leaks.
Figure legend
A ConnectionTest cable 35pin socket box
001 Sockets of component N3/10 (MESFI [ME] control unit)
05 35pin socket box
050 126pin socket box
108 Test cable 266 589 01 63 00
N3/10 (MESFI [ME] control unit)
II 163ConnectionTest cable
III 64126ConnectionTest cable
Warning!
Connection A of test cable 108 may NOT be connected to connection B of the 126pin socket box (050).
Figure legend
055Measuring beakerY62 (Fuel injectors)
Test sequence
Switch off ignition.
Remove fuel rail together with component Y62 (Fuel injectors).
Connect socket box (126pin) to component N3/10 (MESFI [ME] control unit).
Bridge between sockets (F.4) 100 and (F.17) 113 of the 126pole socket box tester.
Page 5582010 Mercedes Benz E 63 AMG Sedan (212.077) V86.3L (156.985)
Copyright ? 2013, ALLDATA
10.52SS
Switch on ignition.
Specified value
Component Y62y1 (Fuel injector cylinder 1) must not drip.
Question
Was the test o.k.?
YES
The test was okay.Further possible causes of fault
Inspect operation and spray pattern of component Y62y1 (Fuel injector cylinder 1).
NO
The test was not okay.Possible cause and remedy
Y62y1 (Fuel injector cylinder 1)
2.5. Inspect operation and spray pattern of component Y62y1 (Fuel injector cylinder 1).
Figure legend
A ConnectionTest cable 35pin socket box
001 Sockets of component N3/10 (MESFI [ME] control unit)
05 35pin socket box
050 126pin socket box
108 Test cable 266 589 01 63 00
N3/10 (MESFI [ME] control unit)
II 163ConnectionTest cable
III 64126ConnectionTest cable
Warning!
Connection A of test cable 108 may NOT be connected to connection B of the 126pin socket box (050).
Page 5592010 Mercedes Benz E 63 AMG Sedan (212.077) V86.3L (156.985)
Copyright ? 2013, ALLDATA
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Page 560
Figure legend(Shopmade tool)
1xClutch 140 545 35 28
2xContact spring 004 545 56 26
1xRed banana connector
1xBlack banana connector
2,2 mRed cable with diameter 1,5 mm(Pin 1)
2,2 mBrown cable with diameter 1,5 mm(Pin 2)
2 mInsulation sheathing with diameter 6 mm
Test sequence
Switch off ignition.
Remove fuel rail together with component Y62 (Fuel injectors).
Connect socket box (126pin) to component N3/10 (MESFI [ME] control unit).
Insert bridge.
Bridge between sockets (F.2) 98 and (F.17) 113 of the 126pole socket box tester.
Switch on ignition.
Component M3 (Fuel pump) runs.
Hold component Y62y1 (Fuel injector cylinder 1) in a vessel and briefly operate manually with shopmade test cable set at sockets2010 Mercedes Benz E 63 AMG Sedan (212.077) V86.3L (156.985)
Copyright ? 2013, ALLDATA
98 and 99 of the 126pin socket box.
Specified value
Fuel injectors should eject fuel uniformly.
Question
Was the test o.k.?
YES
The test was okay. End of test
NO
The test was not okay.Possible cause and remedy
Y62y1 (Fuel injector cylinder 1)
End of test
3. Combustion misfirings
Warning!Communication with ECU required.
Automotive DIAGNOSIS ,REPAIR, MAINTENANCE: Misfiring of cylinder 1 : Damages TWC (P0301)
DIAGNOSIS AND REPAIR, MAINTENANCE, PARTS AND LABOR, SHOP OPERATIONS, TECHNICIAN’S REFERENCE, DIAGNOSTIC TROUBLE CODES(dtc), RELAYS AND MODULES, SENSORS AND SWITCHES,ENGINE, COOLING AND EXHAUST, POWERTRAIN MANAGEMENT, TRANSMISSION AND DRIVETRAIN, BRAKES AND TRACTION CONTROL, STARTING AND CHARGING, POWER AND GROUND DISTRIBUTION, STEERING AND SUSPENSION, HEATING AND AIR CONDITIONING, RESTRAINTS AND SAFETY SYSTEMS, ACCESSORIES AND OPTIONAL EQUIPMENT, BODY AND FRAME,CRUSIS CONTROL.
MBWorld.org Forums
Quote: rick hesek Originally Posted by jvakos: What engine series do you have? If it is 270, 272 or 273, you may not have a bent connecting rod. You may very well have a worn valve guide on the cylinder that is throwing the misfire code.
Before spending any more money, I recommend doing a compression check to see how that cylinder compares to the rest. If a connecting rod is bent enough to cause low compression and a misfire, you would also be getting blue exhaust smoke on start up.
Rick H
Rick – my C32 AMG has the M112k (112.961 per EPC) supercharged engine.It started as a slight mis-fire that was just causing some vibration which the dealer commented about. I drove the car 2 more months and the vibration got worse to the point where a CEL came on and codes were cylinder 1 misfire.Its in the shop now and they did a compression test which came in around 130 and low compared to the “good” cylinders which were around 170 and normal. They said the piston in that cylinder does not go all they way up like the others and is about 1/4 inch low due to a slight bend in the rod. i dont think i have blue exhaust but i trust this shops expertise and been going to them for years and just have an unfortunate situation.it appears this bent rod situation was created by having a hydrolock in that cylinder which was caused by a stuck injector that allowed excess fuel in to the cylinder which didnt burn off. i have no clue how a stuck injector happens but i have 118k on the car and have never replaced them or knew they should be replaced….prob not worth trying to replace that rod which would essentially require a engine rebuild which would be like $5k so think i may need to get rid of it and move on to a new benz (which isnt a bad thing as i’ve owned this one for 10 years)
Misfire on cylinder 3, damages TWC fuel deficiency
C200 Coupe Kompressor
My car is misfiring and I have taken it to Mercedes. (My car has done 52k, 6 years old, full Merc History)
On the first occassion they told me to use Super Leaded for a few weeks and this would get rid of the problem.
And this did not.
So took it back and this time they said I need new injectors, so they put new injectors and this did not work. This was advised by Mercedes Technical in Germany.
I spoke Mereceds Technical in Germany (completely useless) telling them you are trying to charge £800 and the problem is still not fixed.
So they then advise to change the valves and the head at a cost of £5000.
I am an Engineer not a mechanic and have a basic understanding, I did some homework and the problem is that it is a design fault which Mereceds know about.
The problem lies with the valves, the reason and these theiving idiots at Merc wont admit it, is that they want you to pay for a new head as well in order to replace the faulty designed valves with a completely new one, to do this they have to replace the perfectly good head as well.
Mercedes know fully well what the problem is, they wont pay for it. You just have to look atthe design of the new engines.
I hope people take note of this and boycott these theiving idiots!
P0301 – Meaning, Causes, Symptoms, & Fixes
We’ve partnered with RepairPal to recommend trustworthy shops in your area. Enter your details to see certified shops near you that offer upfront estimates, guaranteed fair pricing, and a minimum 12-month, 12,000-mile warranty.
Your vehicle moves when gasoline is burned and power is generated inside a chamber known as the cylinder. Most engines have a 4, 6, or 8-cylinder engine, where more cylinders typically mean more power. Power is generated by pistons that move up and down while fuel is ignited at very specific times. A misfire typically occurs when the timing of this ignition is off. P0301 indicates that cylinder #1 is experiencing misfires.
These shops can not only help you figure out what’s going wrong before you waste time and money on the wrong parts, but they also offer a minimum 12-month, 12,000-mile warranty and stand behind all their estimates with guaranteed fair pricing.
If your vehicle is misfiring and you’re not comfortable diagnosing this issue at home, we recommend finding a RepairPal certified shop nearby to pinpoint the problem and give an accurate estimate for repairs.
With a misfire fault, the first step is to get it diagnosed to figure out what is causing the engine to misfire.
Misfires can be caused by many reasons from a faulty ignition system, fuel system, or internal engine failure. The most common reason for this to happen is faulty or worn-out spark plug coil packs, especially if it’s been a while since you had a tune-up.
How Much Does It Cost to Fix Code P0301?
P0301 can be caused by anything from old spark plugs to vacuum leaks to poor engine compression. It’s impossible to give an accurate estimate without properly diagnosing the issue first.
If you take your car to a shop for diagnosis, most shops will start with an hour of “diag time” (the time spent in labor diagnosing your specific issue). Depending on the shop’s labor rate, this typically costs somewhere between $75-$150. Many, if not most, shops will apply this diagnosis fee to any required repairs if you have them perform the repairs for you. From there, a shop will be able to give you an accurate estimate for repairs to fix your P0300 code.
Possible Repair Costs for P0301
Once properly diagnosed, P0301 may require one or more of the following repairs to resolve the underlying issue. These prices are based on national averages and include parts and labor. Your cost may differ depending on your location and type of vehicle.
Spark plugs: $66-$250
Ignition Coils: $230-$640 (some cars require Intake manifold removal)
Spark plug wires: $180-$240
Fuel injectors: $1500-$1900
Vacuum leak: $100-$200
Fuel pump: $1300-$1700
Fuel pressure regulator: $200-$400
DIY Steps to Diagnose Code P0301
Engine code P0301 could be caused by a number of things, including faulty spark plugs, faulty ignition system, distributor failure, and more. If you’d like to try to fix code P0301 at home without throwing money at parts, you’ll want to follow the steps below for proper diagnosis. Keep in mind this is an intermediate-level diagnosis and repair and not recommended for beginners. Diagnosis requires more specialized equipment beyond what the FIXD Sensor can provide and it can be a time and labor-intensive process for inexperienced DIYers.
DIY difficulty level: Intermediate
This repair requires mechanical knowledge and is not recommended for beginners.
Tools/parts needed (our top picks from Amazon):
STEP 1: USE FIXD TO ENSURE NO OTHER ENGINE CODES ARE PRESENT.
Use FIXD to scan your vehicle to verify P0301 is the only code present. If other codes are present, they must be addressed first.
STEP 2: CHECK FOR LOOSE CONNECTORS OR DAMAGED WIRING AT THE IGNITION COILS.
Look for loose engine ground wires as well. These can cause random misfire conditions. Tighten or connect where necessary.
STEP 3: CHECK THE CONDITION OF YOUR SPARK PLUGS AND SPARK PLUG WIRES.
Worn and old spark plug wires are common causes of random misfires. Replace spark plugs and wires if needed and recheck for misfires.
> How to replace spark plugs in 4 easy steps
> How to identify a fouled spark plug
> How to test spark plug wires
> How to gap spark plugs
STEP 4: CHECK TO ENSURE YOUR ENGINE IS GETTING THE PROPER AMOUNT OF FUEL.
If you have determined that your ignition system is operating correctly, there may be a problem within your fuel system that is causing the random misfires. The following should be checked to ensure the engine is getting the proper amount of fuel.
Check fuel pressure: Low fuel pressure can cause intermittent misfires on multiple cylinders. When the pressure is below the specification, the engine does not receive the proper amount of fuel and will start to lean misfire. The fuel pump or fuel pressure regulator could be the source of the low fuel pressure.
> How to check fuel pressure
Check fuel injectors: Make sure the fuel injectors are functioning properly and activating. Random misfires can be a sign of faulty or clogged fuel injectors that need to be replaced. Also, check that the fuel injector wiring is not damaged and is connected properly.
> How to check fuel injectors by ear
> How to check fuel injectors with a digital multimeter
STEP 5: PERFORM ENGINE COMPRESSION AND LEAKDOWN TEST
If the ignition system and fuel system checks out, you may want to perform an engine compression test and leakdown test to see if there are any mechanical problems causing your misfire.
Common mechanical problems that can cause misfires:
Leaking Head Gasket
Broken valve spring
Broken piston ring
Worn valve guides
Burned valve
Timing chain or belt skipped tooth and engine is off time.
Common P0301 diagnosis mistakes
Loose fitting electrical connectors and broken or disconnected vacuum hoses are often overlooked. Oxygen sensor(s) are another common misdiagnosis for P0301.
Still Need Help Fixing Code P0301?
If you’ve followed the steps above and are still experiencing misfires or check engine code P0301, please contact the FIXD Mechanic Hotline if you’re a FIXD Premium subscriber or find a RepairPal certified shop near you to get the right repairs at a fair price.
Mercedes Engine Misfire Problem – MB Medic
What does it mean when you have Mercedes Engine Misfire
Engine misfires are one of the most common problems we see in many Mercedes-Benz cars. To be honest, it is not because MB cars are weak in this area, but because most owners forget that spark plugs are wear items and need to be replaced at the recommended intervals. As soon as an engine misfire occurs on a Mercedes-Benz, you will notice poor engine performance and strange vibrations that in some cases can be felt even in the driver cabin. The first thing that comes to mind when you get an engine misfire is: “This is going to be expensive.” Take a deep breath because in most cases it doesn’t have to be. In this article, we discuss Mercedes Engine Misfire problems, what are the most common causes that trigger misfires and how to diagnose an engine misfire on a Mercedes-Benz cars.
Common Engine Misfire Symptoms
Under normal operation, the fuel and air mixture entering the combustion chamber of your Mercedes-Benz engine ignites. When the fuel/air mixture doesn’t get ignited one or more cylinders don’t provide any power to turn the engine which gets detected by the Engine Control Unit (ECU) which triggers an engine misfire code.
Depending on the type of misfire and what caused it, you will notice one or more of the following misfire symptoms:
Engine Vibrations
Loss of power
Shaking / Vibrations Noticeable at Low RPMS and idle
Vibrations go away at high RPMS typically over 3000
Engine Stalls in some cases
Poor Engine Performance
Check Engine Light
Fuel / Gasoline smell from exhaust
Blinking Check Engine Light
How to diagnose Mercedes Misfire Problems
Steps to diagnose Mercedes Engine Misfire
Many mechanics and car owners don’t like to work on Mercedes because they believe that MB cars are difficult to diagnose due to the large sensors and electronics. In our opinion, if you have the proper tools diagnosing Mercedes cars is easy. Luckily for you, the misfire codes are stored in the ECU and are very easy (and inexpensive) to retrieve. To diagnose an engine misfire on a Mercedes all you need is a generic OBD II code reader that can be bought in some cases for under 20 at your local auto parts store or onlist. If you would rather invest in an advanced OBD II scanner for Mercedes, then read our article on Top 10 Best Diagnostic Scanners for Mercedes Benz
1. Turn ignition to position II. All dash lights should be on. Don’t start the car.
2. Locate the OBD-II port under the dashboard.
3. Plug your OBD II scanner and let it turn on.
4. Hit Read button to retrieve the fault codes from the ECU. You will get a code such as P0301. These are called diagnostic trouble codes (DTC).
For more help watch the following video.
Now what?
You most likely will get one of the following codes
If you are reading fault codes such as P0301 through P0312, that means that most likely the problem is with one of the cylinders misfiring. This is due to a bad spark plug, spark plug wire or ignition coil issue.
If you are reading a P0301 through P0312 code plus another code, let say P0100. It is very likely that the P0100 fault code which refers to a malfunction in the mass air flow sensor circuit is also causing the misfire codes and even a limp home mode. Lime home mode means the transmission gets stuck in gear, typically in second gear.
The bottom line is that you need to research all the codes that your OBD-II scanner retrieves from the ECU. Now let’s talk about some of the most common reasons that cause engine misfire and check engine light on in a Mercedes-Benz car.
Common Causes of Mercedes Engine Misfire
Spark Plugs
The #1 cause of Mercedes engine misfire is old spark plugs. Spark plugs don’t last forever. They are wear and tear items. Standard copper spark plugs last up to 30k miles while iridium and platinum spark plugs can last over 60,000 miles. If your Mercedes-Benz has over 80,000 miles and still has the original spark plugs, it makes sense to change the spark plugs before you pour money on any other repair. New spark plugs will make your engine run smoother, and you will even see an improvement in gas mileage. Rember that Mercedes-Benz V6 and V8 engines utilize two spark plugs per cylinder. That is typical in Mercedes-Benz engines such as M112 M113 M272 M273 found on E, C, S, CL, CLK, ML, GL, G, R, SLK Class. For example, if you have an E320 (M112 engine) or E350 (M272) your car has six cylinders but requires 12 spark plugs.
Replacement spark plugs for your Mercedes-Benz can be purchased on Amazon if you are looking for a way to save money on parts.
Ignition Coils
Mass Air Flow Sensor
If you replaced all the spark plugs but are still getting an engine miss fire code, then the next item to check are the ignition coils. Mercedes uses one coil per cylinder. In some cases, each coil may power two spark plugs. Ignition coils are easy to replace, and you don’t necessarily need to replace all of the ignition coils if one has failed. Replacing the ignition coil is very straight forward. You will need to unplug the coil, remove the bolt, disconnect the spark plug wires and reinstall in reverse order. If you need a replacement coil, you can get them on Amazon for much less than the dealer.
Mass air flow sensor is one of the most critical sensors in a Mercedes-Benz car. It is responsible for measuring the temperature and volume of air entering the engine. This is crucial because if the mass air flow (MAF) sensor is bad or failing not only will you have poor fuel economy and performance but you may also get misfire problems and other symptoms. Pay close attention to the codes and also look for the following codes related to the MAF sensor.
Fault Codes related to MAF sensor
If you do find out that the MAF sensor is defective, don’t panic. It is not an expensive repair if you are willing to get the hands dirty. You can get an aftermarket sensor, but we recommend sticking with OEM MAF sensor whenever possible.
Spark Plug Wires
When we talk about spark plug wires, you may be thinking spark plug wires are a thing of the past. My Mercedes doesn’t have a distributor. But hold on! Mercedes uses wires between the ignition coil and spark plug on most V6, V8 and V12 engined. You don’t have to worry about spark plug wires if you have an engine that utilizes ignition coil installed directly on top of the spark plug.
While spark plug wires fail less often, we have seen a few cases where those short spark plug wires were either defective or damaged during improper removal. Keep this in mind especially if you change the spark plugs in your Mercedes and you are still getting an engine misfire.
Fuel Pressure
Fuel pressure can cause engine misfire as well. We haven’t seen too many cases where the fuel pressure was the cause of the misfire Generally when Mercedes owner’s experience fuel related problems it is because the fuel pump has failed. If that’s the case, your Mercedes won’t even start to get that fixed first before you start throwing parts and money on your Mercedes.
If you are suspecting fuel related issues, checking the fuel pressure on a Mercedes is very easy. You will need to connect a fuel pressure gauge to the fuel test port as shown in this picture.
The Actron CP7818 Fuel Pressure Tester Kit works very well. It has Schrader fitting required to connect to MB fuel test port. It allows you to tests fuel pressure regulator, weak fuel pump and leaking injectors.
Bad Catalytic Converter
Bad Car Battery
A catalytic converter that is clogged and is restricting the exhaust gasses from leaving the engine can also trigger multiple cylinder misfire. If your catalytic converter is clogged you will notice a drastic drop in fuel efficiency and real struggle getting your Mercedes to accelerate. If the cat is completely clogged your car won’t even start.
The car battery on your MB is very critical and if it fails you can experience a list of electrical malfunctions including engine misfire in some cases. If you have to jump start your MB on regular basis, it is time to get the battery replaced.
Internal Mechanic Issue
Conclusion
Mechanical engine problems can also cause an engine misfire. Burnt valve or blown cylinder head gasket can definitively trigger misfire code and symptoms. If a particular cylinder is not generating the required compression, the fuel mixture on that cylinder may never get ignited. Here you will need to perform a compression test and pay attention to any unusual engine noises.
If your Mercedes-Benz has developed an engine misfire always scan the codes via the OBD-II port. In most cases, a cylinder misfire is caused either due to old spark plugs that need to be replaced. A failed ignition coil or a bad spark plug wires. If none of the above fixes your misfire problem carefully analyze the fault codes, it is possible that misfire may be indirectly caused by another problem in the engine.
Please use the comments section below to report your engine misfire symptoms. If you already fixed this problem let our readers know what the cause and solution was in your case.
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