compresion

jasonxr2racer · Post by **jasonxr2racer** » Wed Jan 21, 2015 8:32 pm

Also could be headgasket inbetween 3 and 4 starting to go or head starting to warp. Lets hope its the easy fix and valve clearances as that will make compression go down

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Wed Jan 21, 2015 8:57 pm

jonja wrote:Some mechanic said that this could be related because if one cylinder isnt working right car cant idle with 3cylinders on 800rpms because it will just die, so ecu is raising rpms so car wouldnt die. Dunno if thats possible .

I like his thinking, but I don't think the prelude idle control system is advanced enough to make that sort of call (or able to adjust the idle by that great an amount).

prelude91 · Post by **prelude91** » Wed Jan 21, 2015 9:33 pm

Broken valve spring on No4 cylinder?

Post by **4thgenphil** » Wed Jan 21, 2015 9:51 pm

How old is the head.? Could be warn valve seats

jonja · Post by **jonja** » Wed Jan 21, 2015 11:18 pm

ive got no idea how old is the head but i have it on my car since 2014 may

i hope its something with valves because engine have done total about 120k miles

so my high idle is not related with that one cylinder not working?

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Thu Jan 22, 2015 8:10 am

Wouldn't have thought so, but I wouldn't worry about that for now anyway, I'd focus on sorting out the compression first and then move on to other things.