|
Forget the posts about messing with the cap... it's only a symptom of teh problem and shouldn't be happening. You mention you have cleaned the PCV and breather box... you're sure, right? Since you don't mention a flame trap I'm assuming this is a turbo, right?
I had a similar problem on my brick, and it turned out to be symptomatic of a lean condition. Basically a mixture problem generated a slight lean condition that was only really apparent and a problem under boost. The more boost I gave it, the worse it would run. If I boosted while this was happening the result (aside form retarded running) was a wet spot arond the filler cap as the higher pressures would push oil past the rings, etc.
If this is the same as your problem I would suggest examining the following:
1) Inspect all pressure side turbo hoses... in fact, just inspect all the hoses closely for any leaks. Look at the AMM to turbo, turbo to int., and int to int. man. hoses, paying particular attention to the low spots where oil can pool and rot the hose.
2) Check that it isn't a bad sensor connection. Disconnect the AMM and KS harnesses frm the sensors, examine them for damage or problems, and then reconnect very deliberately making sur ethey click in place.
3) Check the CBV and make sure it is attached to the holding p,ate firmly wit the allen screws. Soemtimes they can back out and allow teh unit to leak. the CBV is that silver bell looking thing at the front left of the engine with a small hose off the top running over to the intake manifold (across teh valve cover). You might also check to see if teh CBV is bad by seeing if it holds pressure when you suck at the hose from the top.
4) Check that it isn't a bad sensor related to mixture. ECT, KS, AMM, and o2 are the ones to check for proper resistance, etc.
It could also be something big like a broken ring or something, but as long as it runs well otherwise I would look for a sensor or hose problem. BTW, if you run crappy gas that could cause the same problem... lower octane fuel doesn't burn evenly under compression (i.e., boost) and would trigger pre-detonation which would trigger the knock sensor which would retard teh timing which means your engine would be running lean.
good luck,
rt
|
