Need this running asap take 2

[Mean Green]

I installed the new FPR and boy what a difference! But...not fixed. It does get into boost MUCH smoother but it still face plants. At cold idle I am getting 10hg vac now and it is very erratic. I can drive it around, stop and let it idle and it has 17hg and then I can drive, stop, let it idle and it has 14hg. The rear turbo is still glowing but I really think that, the rear head has been the problem from the get go. I am thinking that the guides are shot and causing the valves to not work properly. Only thing that is weird is that I had the heads rebuilt.

[stealthee]

I dont think its a head issue. If it were a head issue I would suspect the manifold to glow. If the turbo is glowing, I would suspect it to be a turbo problem. Maybe thats just me though.

[Mean Green]

Well, any and all opinions are greatly appreciated at this point. I need all the help I can get with this illusive issue.

[stealthee]

It could explain the erratic boost issues. :shrug:

[Mean Green]

It could explain the erratic boost issues. :shrug:

Yea, that's exactly what I'm thinking. I rolled down the windows to listen to the turbos and watched the boost gauge at the same time. The boost pressure will sit at 7 psi but I can infact hear the turbo's fluctuate as far as sound pitch is concerned. I know it sounds weird but that is my assessment.

Also the other day after I finished replacing the front head, I started the engine and it would only run on 5 cylinders. I freaked out and hit it with a compression test and it revealed no problem despite me being able to hear the dead spot while it was starting. I took the front valve cover off assuming it was the front head with the issue but after further investigation, all the front valves where all at the same position when fully retracted. I then took off the rear valve cover and could hear what sounded like a popping noise. The rear valves where in the right spot as well. I put the car back together and fired it up and to my amazement, it was now running on 6 cylinders.

Later that day, the same problem happened again except I let it warm up running like that, on 5 cylinders. I turned it off and let it cool down for about 20 minutes. Came back out and it fired right up on all 6 again. I tried to narrow the compression loss down to a single cylinder but I have been unable to duplicate it when I have the logger readily available.

[Mean Green]

That's what the "injector disable" feature is for. You disable them one at a time and see which one makes no difference....just go straight to no 3.
Your cams have probably jumped a tooth at the crank since you put it back together, in turn probably because you didn't tension the belt properly.
Just a guess.
You'll know when you pull the covers.

Steve

I wish that where the case. I pulled the covers already and found nothing wrong with the mechanical timing. I put the logger on the car to use the injector disable and started it up but I could not get it to skip again.

[stealthee]

That's what the "injector disable" feature is for. You disable them one at a time and see which one makes no difference....just go straight to no 3.
Your cams have probably jumped a tooth at the crank since you put it back together, in turn probably because you didn't tension the belt properly.
Just a guess.
You'll know when you pull the covers.

Steve

If timing were off a tooth at the crank then it would affected at all times, every time its running since timing would either be a tooth advanced or a tooth retarded.

I'm still convinced its a turbo related issue.

[Keyan]

how about a clogged injector? have you tried swapping injectors front to rear to see if you can make the front turbo glow? then try switching the coils. and the spark plugs. might as well make sure its none of that. eliminate things one by one.

[Mean Green]

yea, I've swapped injectors twice already with a completely different set and also swapped front and rear bank with no improvement. The car is now idling with 8hg at cold idle and goes up to 15/16hg at hot idle.

[colt45 gto]

that shit that was round the valves may have got into the turbo impellar. just a thought?