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Cylinder Misfire P306 Need some help or any suggestions

jr_152
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jr_152 Member

jr_152

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My C4S wuth 60K miles just threw the Check engine light. Hooked up my PST2 and got the P306 misfire cylinder # 6

I changed spark plug, and coil, and erased fault, and still the CEL came on.

I then assumed it was the injector, so I hooked up a noid light, and pulse is OK, so I just spent all day replacing # 6 injector with a new one.

I thought that would have solved my problem, but after I started the engine, the CEL came on again.

If I don't let the engine idle and drive it on the freeway, it runs ok, and the CEL does not come on. Once I let it idle, it comes on.

I am going to do a compression test on # 6, and a leakdown test, but I think being it runs ok at a higher RPM, it would not be compression.

I don't know if the VarioCam has anything to do with this problem.

Appreciate any help or suggestions from anyone. I do not want to take it to the dealer and get ripped off.

Forgot to put in the year, its a 2004 C4S

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RFM Member

RFM

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Vario cam is not the problem, rather the valve lift function on Vario cam plus system. Most of the time is a locking height mechanism inside the valve lifter the cause. Look a bit around, such cases are already been addressed.

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logray Member

logray

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RFM has some good advice, there was a thread here very very recently which pretty much exactly mirrored what you are experiencing. His turned out to be a stuck lifter and once replaced the problem went away.

As long as the cylinder and plug looks fine, you are prob looking at a lifter, but should eliminate everything before opening the cam cover.

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  • 1 month later...
jr_152 Member

jr_152

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Just an update.

Got all my parts and opened valve cover. pushed on the lifters, and was very happy to find the problem right away.

One of the exhaust lifters pushed in easily, so for some reason it went bad.

Replaced all lifters for cylinder # 6, closed it up and cleared all fault codes and started it up.

Runs like a charm.

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