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Re: intermitant boost is my problem..
Posted by JohnK (more from JohnK) on Wed, 10 Mar 2004 06:49:34
In Reply to: intermitant boost is my problem.., steven, Tue, 9 Mar 2004 17:20:44
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Here are some things to check, just hunches.
First, pull the APC solenoid plug when the car is cold to see if you are getting just base boost, i.e. is the low boost identical to base with plug pulled. (not close...identical)
If cold boost is different from base, you are getting some APC operation, and then I would check for loose turbo flange and exhaust connections, which may expand and seal better when the car heats up. Your APC solenoid might be gunky and when the oil heats up the solenoid frees up. You can clean it with carb spray and finish with WD40.
If back in the first test, you verify that you are only getting base boost, I would look for a funky electrical connection that works better when warm. Brake boost cut switch, cruise/vac switch on fender wall, bad connection at APC box, bad connection at knock sensor, etc.
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