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Rings and Valves
Has anybody had any problems with the piston rings or the valves wearing or not seating properly on a 318i 1988 E30? Compression is a bit low and car seems to lack power. Under load it judders like its missing on one cylinder and seems to miss when cruising but not as bad. Checked for air leaks, cracks, ICV ect, all fine and ive changed more critical components. Any ideas anybody?
Many Thanks
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How many miles on the engine?
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95K but in extremely good condition, never thrashed
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Do a leak down compression test. That will tell you what is leaking. Hissing in the intake means intake valve problems. Hissing in the exhaust is exhaust vavle problems. Hissing out the oil filler cap is ring problems.
Might also be ignition problems, froma bad wire, bad spark plug, etc.
Could be a bad/dirty fuel injector.
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by leak down compression test do you mean a manual crank and listen? Any ideas on why the car stalls if you try to drive it when starting from cold? Give it a couple of minutes and away you go, seems like a heat and time related problem whuich worries me more as its probably internal, like a valve which would explain a few things. Done all the usual tests, all seems ok
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No, a leak down test applies compressed air to each cylinder in turn and measures how much leaks out. The leaking air can be heard in eitherthe intake, exhaust or oil filler.
Cold start stalling tends to be something wrong with te enrichment circuit, cold engines need a richer mixture than warm/hot engines. NOT valves or rings.
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Rings and Valves