Hey guys A few months ago I had some rough running and p0301 on my engine. I replaced all four spark plugs and the car has been doing ok since. When I replaced the spark plugs I *think* I saw some liquid in the spark plug hole for cylinder 1... I also *think* I swapped the cylinder 1 coil on to cylinder 3... The other day the car started to run rough and p0301 came back. The car's not losing any noticeable amount of oil or coolant and still returns +50mpg. Today I've checked cylinder 1 and it seems there was water in it again, about to the level of the top of the spark plug nut (the coil plug came out dry)... I'm thinking the water is a red herring (some how passing the coil gasket/boot) and unlikely to cause a problem. My thoughts are to replace the coil packs and see if this helps but I thought I'd check here to see if anyone has any thoughts or similar experience? It's a well looked after 2005 with 135k on the clock. Cheers Dan
If the liquid was oil and not water I'd say you need to replace your valve cover gasket. But that symptom doesn't cause a misfire code. Does the vehicle have a history of running low on oil? Sometimes crankshaft bearing failure can cause a misfire code. At this point seems like a compression tests and borescope inspection is the next step.
Hi Camper, I just checked the tissues I dried it out with. It's definitely water. I don't believe coolant runs through the valve cover so I can only assume it's rain water some how... It's also got no real smell or colour to it. There's no history of coolant, oil or performance loss. I'll keep a compression test in mind. I'd need to find a friendly/decent garage for that tho. Cheers Dan
