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Mercedes Benz SLK 320 V6 2002 - Intermittent misfire, P2050, P2052, P2055 #

Posted by John White on May 22, 2009, 1:58 pm

Year of Manufacture *: 2002
Engine Code or Type *: v6
( Optional ) Scanner used: solus-pro

hi all.
got this in at the moment,customer complaining of "judder whist driving".management light on.
codeS read.
1.P2050 misfiring,damages twc see currently valid strip P0300.

2.P2052 misfiring of cylinder 5,damages twc,see currently valid strip P0305.

3.P2055 misfiring of cylinder 6,damages twc,see currently valid strip P0306.

have cleared codes,road tested with live data,
starts & drives lovely,after a few miles,light throttle,slight hesistation/holding back,drive a bit harder,slight misfire,drive again,ok for a few miles,then this hesitation reappears,all live data ok,& management light not coming on?
fitted new spark plugs a few weeks ago ,genuine plugs.
i think it might be the m.a.p sensor,but at £196 i'm a bit reluctant to fit one & not fix it.
any advise would be nice.
john

Re: MERCEDES SLK 320 V6 MISFIRE AT TIMES ?

Posted by Gerard O'Sullivan <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT2866' width='330' height='300' border=0 style='border:none;'> on May 22, 2009, 4:29 pm, in reply to "MERCEDES SLK 320 V6 MISFIRE AT TIMES ?"

John

I think you mean MAF sensor not m.a.p sensor.

All I can say to you is that I'd fit a MAF for this problem and be 99% sure it would sort it out. It's difficult to check a Mercedes MAF in live data because of the rev limit when stationery but you might still get some evidence to reassure you that you have a MAF fault. You could also try running the car with the MAF disconnected and see if the symptoms change. This doesn't always show a conclusive result however.

There are a whole range of other potential causes of your symptoms ranging from contaminated fuel, HT leads, coils, low fuel pressure, air leaks and so on BUT I'd try a MAF if I were you.

Gerard

Gerard

Re: MERCEDES SLK 320 V6 MISFIRE AT TIMES ?

Posted by john white <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1071' width='330' height='300' border=0 style='border:none;'> on May 22, 2009, 9:02 pm, in reply to "Re: MERCEDES SLK 320 V6 MISFIRE AT TIMES ?"
Tony White

thanks for reply gerard,sorry i did mean MAF sensor,been a long week.i'll have a chat with customer.
john

Re: MERCEDES SLK 320 V6 MISFIRE AT TIMES ?

Posted by Sean Mc Gettigan <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT5291' width='330' height='300' border=0 style='border:none;'> on May 26, 2009, 8:53 am, in reply to "Re: MERCEDES SLK 320 V6 MISFIRE AT TIMES ?"
Sean McGettigan

Hi John,
'but at £196 i'm a bit reluctant to fit one & not fix it'
which is exactly why you should get someone who does diagnostics to test it for you and find the fault.
Is there nobody near you who does diagnostics?
Regards Sean

Re: MERCEDES SLK 320 V6 MISFIRE AT TIMES ?

Posted by John White on May 26, 2009, 8:09 pm, in reply to "Re: MERCEDES SLK 320 V6 MISFIRE AT TIMES ?"
Message modified by board administrator May 27, 2009, 4:03 pm

hi sean thx's for post,yes i do have a diagnostic man i can use,he's been on holiday so haven't been able to get hold of him.
regards john.
p.s thank you tony for the post,i'll investigate

Re: MERCEDES SLK 320 V6 MISFIRE AT TIMES ?

Posted by Stephen Wright <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1023' width='330' height='300' border=0 style='border:none;'> on September 28, 2009, 10:40 am, in reply to "Re: MERCEDES SLK 320 V6 MISFIRE AT TIMES ?"

Hi John how did you get on with the misfire we have one in at the moment with same fault.
Cheers steve

Re: MERCEDES SLK 320 V6 MISFIRE AT TIMES ?

Posted by john white <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1071' width='330' height='300' border=0 style='border:none;'> on September 29, 2009, 9:50 pm, in reply to "Re: MERCEDES SLK 320 V6 MISFIRE AT TIMES ?"
Tony White

hi steve, fault was with auto gearbox,wasn't exactly a misfire,more of hesitation,do a extended road test,10 miles +,if you feel it getting worst & when you come to stop the gearbox gives a little thump,it's the gearbox contaminated with coolant.
hope this helps,
john

Re: MERCEDES SLK 320 V6 MISFIRE AT TIMES ?

Posted by Mark Carter <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1428' width='330' height='300' border=0 style='border:none;'> on September 30, 2009, 8:41 pm, in reply to "Re: MERCEDES SLK 320 V6 MISFIRE AT TIMES ?"
Mark Carter

Gearbox fault is common on this and other merc's of this age.
It is caused by the rad failing and feeding the gearbox with coolant. you can do a glyco test on the gearbox oil to prove. HTH
Regards Mark.

Modern cars, Its all wizardry and witchcraft

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