You are watching: Can a leaking valve cover gasket cause rough idle
I was wondering if a valve cover gasket that leaks oil can cause the idle to be rough? The leak is not massive but it does leak a quarter sized drop every other day and the cross member is completely wet with fresh oil on it. The leak is from behind the engine, next to the intake manifold or possibly onto the intake manifold. I already have the new gasket sitting on the drawer on my room. Can this valve cover gasket be a contributing factor to why the idle is a little jumpy at idle? Btw, it jumps fom 800-1150 out of random, not all the time though. Usually whenever it”s warmed up. Thanks for the info
If you have a leak in the intake manifold gasket, you will most likely get oil in your spark plugs. Happened to me. My car had a bad intake gasket and oil got into the spark plugs. I only realized this when the rough idle continued. Rough idle can be caused by a poor spark. Take your plugs out and inspect them. Do you have any CEL codes pending or on?
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Sorry for the terribly late reply, Im not sure if it”s throwing codes or not because I don”t have a code reader, although I should. The check engine light isn”t on though so hopefully that means there”s no codes. I did notice some oil on cylinder 2 or 3″s spark plug. I”m gonna change the valve cover gasket and spark plug gaskets on Sunday.
A code reader is a paperclip and a little knowledge. Jumper 2 wires in the diagnostic connector in the engine bay, and count the flashes of the CEL.Your spark plugs would have to be drowned in oil to cause a misfire on otherwise good components. Not likely the issue….
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