saxmanjoseph
New Member
After only ten minutes of use my clk 200 starts firing on three cylinders only. I noticed someone had this problem before (simon22) and wondered if it was resolved ?.
clk firing on three cylinders only
- Thread starter saxmanjoseph
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Sp!ke
Administrator
yep, get it on a star for a diagnostic - no point speculating.
- Joined
- Nov 27, 2004
- Messages
- 4,800
- Location
- Southampton
- Car
- 65 Plate E350 CDI Convertible, 2006 CLS 55 AMG, 1997 C230K, 1999 C43/55 AMG
Hi,
Could be many things but if it were mine and I was trying to avoid a garage bill I would start by replacing the Spark plugs, then the leads including the plug caps under the coil packs, then if the fault was still there I would try swapping around the coil packs to try to eliminate the misfire.
But its a lot less hassle to get the codes read on STAR, and be told what the fault is and possibly cheaper too as you would only have to buy the part that is required.
Could be many things but if it were mine and I was trying to avoid a garage bill I would start by replacing the Spark plugs, then the leads including the plug caps under the coil packs, then if the fault was still there I would try swapping around the coil packs to try to eliminate the misfire.
But its a lot less hassle to get the codes read on STAR, and be told what the fault is and possibly cheaper too as you would only have to buy the part that is required.
saxmanjoseph
New Member
I am in Spain and it is rather difficult trying to solve problems here . I have had the star diags done by three different garages including Mercedes and no one has a clue. Thank you guys
saxmanjoseph
New Member
Still have not resolved this problem, however, I discovered that it only happens when I stop at lights etc. So I now switch off the engine when I stop and the problem does not arise. Even drove to Madrid, beautiful ride and it did not give me any trouble.Any ideas ?..
grober
MB Master
Sounds as if a plug may be fouling up while the car is idling. This could be due a lack of HT voltage on said plug. Possibly due to a faulty coil extension lead OR or coil extender under coil OR faulty plug--- what plugs are you running? exact age of car and engine no would help also ?
saxmanjoseph
New Member
Hi Graeme , Thanks for the reply. its a 2004 clk 200 kompressor. I tried unpluging a lead which seemed to control 2 cylinders when it was in a bad idle state and the engine almost died. the next day i tried the same lead and it made no difference. so I unplugged the lead controling the other two cylinders and then the engine almost died . Proving..... I dont know what !.Any ideas ?
saxmanjoseph
New Member
No ideawhich plugs,butthey are new and expensive. It was suggested that plugs were the problem, sorry, wrong !.
grober
MB Master
There are issues with plugs on these engines with the multi-electrode type being replaced by platinum/Iridium fine tip plugs which require far less HT voltage to fire. There was a thread on here about this a while back from a guy in Bulgaria= worth a read. http://www.mbclub.co.uk/forums/engi...k-rough-idle-detonations-exhaust-headers.html
Diagnosis on HT circuits is difficult because the ECU cannot monitor what's going on directly ---only through "inference" from the low tension side whose voltages it can monitor and flag. If the star diagnosis is not picking up anything then your problem is likely in the HT side. Of course its pointless monitoring any electrical system while its running correctly --it's only when the fault is "present" that you can observe and record it. In this case an old fashioned oscilloscope engine analyser that can show you the HT firing lines on every cylinder should tell you where the fault is occurring. Perhaps a good auto electrician centre [ Bosch centre] could help?
Diagnosis on HT circuits is difficult because the ECU cannot monitor what's going on directly ---only through "inference" from the low tension side whose voltages it can monitor and flag. If the star diagnosis is not picking up anything then your problem is likely in the HT side. Of course its pointless monitoring any electrical system while its running correctly --it's only when the fault is "present" that you can observe and record it. In this case an old fashioned oscilloscope engine analyser that can show you the HT firing lines on every cylinder should tell you where the fault is occurring. Perhaps a good auto electrician centre [ Bosch centre] could help?
