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Old 10-09-2012, 09:36 AM   #1
portable_johnny
Scooby Newbie
 
Member#: 283652
Join Date: May 2011
Default only 4 pounds of boost!!!

Im getting my head spinning with this issue. im a general automotive tech who hasnt gotten too much experience with turbos simply because not many people around me drive them. anyway...picked up a side job. 2000 rs with 02 wrx swap. i figured i may as well take it on and learn the engine and system because its the swap i want to eventually do in my car...

~so the issues are...sunroof stuck open. (power to relay, power probed the connector and the motor is seized, thats a given) needs a motor.

~no idle. i picked up the car, wouldnt hold idle. put the clutch in and it dies and it had a CEL. took off intercooker, did a good throttle body cleaning and now it idles. high, but idles.

~Only boosts 4 pounds.

The kicker is everything ran fine, boosted 16 pounds and was an awesome car before it got parked for a month. was started once a week and idled, never driven.

so i brought it to work, put the scanner up to it and got p1090, p1093, p1507. which after some research, the tumbler generator valves. took them off cleaned it out (dont think theyre serviceable, but ya never know) put it back together and light still came back.

for all i know, that could be a seperate issue from the boost. going to get the tgv for both sides and do that. but why wont it hold boost. the turbo screams.

did a smoke test on the whole vacuum system. from the brake booster (which had some external cracks, but wasnt leaking.) then again from the air box. which to my understanding, filled the turbo, piping, intercooler right up to the throttle plate. no leaks, so that rules out a possible leak in intercooler. found a disconnected vacuum line down behind the altenator, but didnt fix the issue.

was thinking about the wastegate solenoid. that stupid electrical thing by the airbox. but i dont think that will function anywhere under 10psi and it doesnt go that high.

so i think im down to turbo or wastegate. turbo screams and sounds like how it always sounds. took a pair of pliars and moved the wastegate door and it did have propper movement, but maybe it could be gummed up like how a throttle body works? will the intake runners have anything to do with it?

im just trying to get more opinions, other than my inexperienced opinion to try to figure it out. remember the car sat for a month and ran fine when it was parked....

Thank you for your time and efforts.
~Kevin
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