Quote:
Originally Posted by noquarter1
At idle, it registered flatly at 0. The needle didn't move.
I then did a 0-60 run with the accelerator firmly against the floor. The highest psi it registered was 3.
So, this would suggest there's no boost at all, is that correct? I wasn't able to get to the turbo tonight to see if it spins or if the wastegate opens. Could a clogged cat converter also be a culprit?
Thanks so much.
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Yes, boost is not nearly sufficient. Minimum of 12 psi at peak pressure is what you are targeting.
So, either airflow is restricted (check the air filter yet? No mouse nest somewhere in the intake?) or exhaust is restricted, or the waste gate is failed open so all the boost is dumped, or your turbo has failed.
I'd pull the intake accordion plenum from the front of the turbo, and check out the impeller. Should look good, spin relatively easy by hand, have zero play going in/out, and just detectable play going up/down.
Next pull the air filter and check underneath. There is some kind of MAF device between air filter box and turbo, if you can check that to make sure it has not frozen up in closed position and is starving the intake of air.
After that, I'd try the exhaust removal step, just make an opening somewhere after the turbo and before the catalytic converter / filter.
Your car doesn't still have the oxidative cat under the hood, does it?
If all these things don't help, then you probably need to pull the turbo and fix the waste gate. You can try to fix it on the car, but that may not be possible. Somehow it is jammed open, hard to say if that is external to the turbo or internal.