please pleasr help w211 e240 misfire under load
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Joined: Apr 2011
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w211
please pleasr help w211 e240 misfire under load
hi all, im at my wits end with my w211 e240, it had multple misfires and a problem with goin past 4500 rpm. ive solved the multple misfires with new coils, plugs and a new MAF. but its still have the misfire at 4500 rpm. under hard acceleration the and above 4000 rpm it starts to misfire and continues to do so till i pull in and turn the car off and on again. it throws up an engine check light everytime, and when i plug the car in it shows up a misfire on cylinder 4. i have charged coils and leads etc around and its still shows up cylinder 4. i have also now changed the cats, but the problem is still there. the car drive perfect and it will drive car the way in every gear to any speed once you dont gun it hard. any ideas where to look next? ive done a compression test on all cylinders and there all perfect, and all sparks have been changed.
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Joined: Aug 2006
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From: Q8
2007 E500 Designo Brabus B8 / 1991 500E (Sold)
Your mechanic should go through all the actual values for this cylinder:
- Ignition angle.
- Injector timing.
- combustion time.
- Knock sensor (ignition retarding)
With all the parts you've replaced. I suspect a faulty injector/ fuel delivery, Have the mechanic switch the injectors to see if the misfire moves to another cylinder.
- Ignition angle.
- Injector timing.
- combustion time.
- Knock sensor (ignition retarding)
With all the parts you've replaced. I suspect a faulty injector/ fuel delivery, Have the mechanic switch the injectors to see if the misfire moves to another cylinder.
Thread Starter
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Joined: Apr 2011
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w211
right, just switched around the injectors, put number 4 (which is showing the misfire code p0304) with number 1, and the misfore on 4 is still there! dont know where to go next with this so any help would be greatly appreciated. no matter what i do the sec you drive it hard it above 4000 rpm it turn on the engine check light and drive lumpy till switched off and on again. cant figure it out.
Junior Member
Joined: Aug 2006
Posts: 18
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From: Q8
2007 E500 Designo Brabus B8 / 1991 500E (Sold)
Any Other Codes showing? remember to clear all the faults codes after every attempt.
Have you monitored the Actual values?
Please provide the VIN number if possible.
Its a B**** of a problem, But hang in there..
Have you monitored the Actual values?
Please provide the VIN number if possible.
Its a B**** of a problem, But hang in there..
Last edited by 195910; Apr 17, 2011 at 11:44 AM.
Thread Starter
Newbie
Joined: Apr 2011
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w211
no, no other codes at all, just p0300 on cylinder 4. ive cleared the codes everytime, engine check light goes out, then bring it for a short blast and light comes back on and she runs lumpy again. every shows up fine on actual values. freeze frames are between 4500 and 4850 rpms but nothing usual shows up.
Junior Member
Joined: Aug 2006
Posts: 18
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From: Q8
2007 E500 Designo Brabus B8 / 1991 500E (Sold)
no, no other codes at all, just p0300 on cylinder 4. ive cleared the codes everytime, engine check light goes out, then bring it for a short blast and light comes back on and she runs lumpy again. every shows up fine on actual values. freeze frames are between 4500 and 4850 rpms but nothing usual shows up.
1 - Injectors, Perform the Injector tests (monitor cylinder 4)
2 - fuel related:have you had any work done on the fuel pump/line/rail/filter ?
If so, please states them.
3 - Read the adaptation values for each cylinder and observe high deviations in cylinder 4. reset and perform self adaptation.
4 - If you've replaced the ignition coils (its actually stated as NOT a remedy), test the ignition module.
5 - Check function of crank position sensor (also visually inspect)
6 - Check Fuel Pressure and capacity.
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MBWorld Fanatic!
Joined: Feb 2007
Posts: 1,348
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From: Northern VA / DC
CLK 320 (2001) and 2015 GTR
bro, i got the same prob in my 320clk.. misfire cyclinder 5 and i have done everything that u did.
above 4500 rpm, it misfire.
heading to the dealer on monday at 9 am.
above 4500 rpm, it misfire.
heading to the dealer on monday at 9 am.
Super Member
Joined: Nov 2008
Posts: 620
Likes: 16
CLS500 M113
I know this is an old post, but I am currently experiencing the EXACT same problem on my E240!!
Check your O2 sensor on the cats...I have added an H pipe and removed my secondary cats and resonator and the problem started IMMEDIATELY after.
My car is going into the shop for this today.
Check your O2 sensor on the cats...I have added an H pipe and removed my secondary cats and resonator and the problem started IMMEDIATELY after.
My car is going into the shop for this today.
Newbie
Joined: Jul 2013
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2003 E240, 1982 500SL, 2009 R320
E240 Misfire
Hope you got yours sorted, exactly the same with mine but showing cylinder 1, replaced plugs, MB leads coil packs air mass, runs great but still the misfire. Turns out it has variable pressure in the inlet manifold, and is losing water. About to remove the head and have a look will post results soon
