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Rings and Valves

893 views 2 replies 2 participants last post by  peplow 
#1 ·
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
 
#2 ·
Are your spark plugs fouling? Using alot of oil? If so your rings or valve seals could be the culprit. Lots of blow by from the rings will cause loss of power, and the missing might be fouling plugs from the excessive oil in the combustion chamber.
 
#3 ·
Have checked the plugs before, all fine, perfectlt coated and it uses no oil at all. Unless a plug is brwaking down under load and so burning any evidence away on a good stroke? Might just buy a new set anyway to be sure, could be the leads but doubtfully.
 
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