philip77o

Hi, I did a compression test on my 86 turbo, engine warm, wide open throttle no plugs, the results were:
(from crank to flywheel)
1- 145
2- 125
3- 145
3- 141

16% between 145 and 125. No sign of oil/coolant mixture of any sort. When it is warmed up it idle and decelerate funny, my air/fuel ratio gauge is going back and fort from a little lean to a little bit rich like the fuel injection wouldnt be constant... I don't know if it's related with the low psi cylinder 2.

eman930

What wideband are you using? I'd check your valves

philip77o

auto meter pro-comp ultra lite

Van

Take the temps of the exhaust headers... You might find #2 is a bit cooler than the others.

Could be a cracked compression ring or a bent valve or burned valve seat.

philip77o

cyl 1 ~170°C
between cyl 2-4 between 260-300°C

Here is a video, warmed engine on idle

http://www.youtube.com/watch?v=MyfL8...ature=youtu.be

eman930

First, is that a wideband or no? Also with your idle not stable your gonna see a swing in your A/F ratio. I'd try to get the idle stable, Then start Diag on why your low on compression

philip77o

Do you have an idea why the idle is unstable like that ? It also does the same thing on deceleration when I let off the gas while driving.

I don't think it's a wideband, it's not written on the gauge. I bought the car about 3 weeks ago, I'm not really used to turbo car...

eman930

I'd check for vacuum leaks, Also if you haven't done the Venturi delete or your car Do it, cleans up Alot of the vacuum mess, I'd also get a good Wideband A/F setup, those shortband ones are not as good and tend to jump around Alot like yours is. The other thing you can try is resetting your idle