I have been having some trouble with my silver top. It would randomly drop cylinder 1 while driving. Then it lost compression on 1 and 4 so I had the head rebuilt with a new gasket and studs and got it all back together. Now, when the engine is running, it is very rough and shakes the whole car, so I unplugged the injectors one by one. With injector 1 and/or 4 unplugged, rough idle does not change, it doesn't affect the engine at all. 2 or 3 unplugged and it kills the engine. New plugs are good and spark. Had the injectors cleaned and bench flow tested, they are good, also switched them around and the problem stayed on 1 and 4. Each injector is clicking like they normally would. Brought the Oscope out and each injector has the correct readings (according to my buddy who does that for a living). Fuel pressure is around 40 and with the plugs out, you can smell fuel in the cylinder after cranking. I have 2 ecu's, both produce the same problem but I am not sure if either of them are working properly. One is rebuilt with new compositors and one is original. If i knew anyone in Houston with a working ST I would cross test, but I don't have that option.
At this point I am willing to try anything, if anyone could point me in the right direction, I would very much appreciate it.
20v ST only runs on 2 cylinders
Re: 20v ST only runs on 2 cylinders
Gasket failure on 1 AND 4 would be extremely rare.
What's the compression?
Pulling 1or4 above idle speed any different?
Plugs wet or dry on #1 after your test?
1342 firing order. I think you have them switched.
What's the compression?
Pulling 1or4 above idle speed any different?
Plugs wet or dry on #1 after your test?
1342 firing order. I think you have them switched.
Re: 20v ST only runs on 2 cylinders
I will check when I get off work.
When it lost compression #1 was at 45lbs, #4 was 60lbs, 2 and 3 were 160lbs+-5.
Thank you for the help, I'll post updates.
When it lost compression #1 was at 45lbs, #4 was 60lbs, 2 and 3 were 160lbs+-5.
Thank you for the help, I'll post updates.
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totta crolla
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Re: 20v ST only runs on 2 cylinders
What is the compression on cylinders 1 and 4 now ?
I may not have been a head gasket fault but could have been the ring lands.
I may not have been a head gasket fault but could have been the ring lands.
Re: 20v ST only runs on 2 cylinders
allencr wrote:1342 firing order. I think you have them switched.
As embarrassing as it is, you were correct! I can't believe I looked over something so simple. Thank you very much for helping, Next time you are in Houston, the beer is on me.
It runs pretty good now, idles is very high but I don't think the rear O2 is plugged in and I know the water temp censor is unplugged. Maybe those will fix that problem.