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Boost Problem
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Old 28 May 2009, 10:24 PM   #1 (permalink)
Fresh Scooby
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Boost Problem

I have recently bought a 1995 WRX wagon

Basically it wont full boost,It idles and revs fine and its smooth at about half throttle until it gets over 4,000rpm and as try's to boost more. If I plant the throttle it stutters and backs off and you can see fuel coming out the exhaust behind you.

If you back of the throttle it will go above 4K, if just hold it around 5k you can hear what sounds like a constant boost leak or a similar noise dump valve but constant.

I have started to check some of the hoses and put jublie clips on any hose i think should of had them on which seems to of improved it slightly! I have also tightened the one on the bailey dump valve which looks a bit dirty and oily.

I took the intercooler off and that all looks fine! apart from the samco hose running off the bottom intercooler pipe to the BOV which is too big really and wasn't sealing properly i have put this on properly now.

I also took off the turbo inlet hose but this also seems fine ie no splits or cracks.

Test drove the car but still wont full boost and is struggling to go above 4,000rpm with any boost

I'm a bit at a loss on what to try next!

Thanks in advance for any help
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Old 31 May 2009, 09:26 PM   #2 (permalink)
Young Scooby
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Re: Boost Problem

what is it boosting at mate, i think you are running in safe mode have you done a ecu reset? / checked the codes?
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Old 01 Jun 2009, 11:43 AM   #3 (permalink)
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Re: Boost Problem

safe mode wont even let you go above 4k rpm even slowly.

sounds like its overboosting, has it had a decat put on it or an induction kit?

if not then need to find the reason for it
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Old 01 Jun 2009, 11:55 AM   #4 (permalink)
Fresh Scooby
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Re: Boost Problem

I dont thing its safe mode, I dont have a boost gauge so not sure what its boosting! It doesnt have any mod's other than a Bailey DV

I have checked the codes this weekend and got error 45 MAP sensor so I am going to try and get a replacement for that

Cheers for you help guys
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Old 01 Jun 2009, 12:00 PM   #5 (permalink)
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Re: Boost Problem

aha,Baileys dumper......take it off a check the diaprham as they are prone to going weak,best bet it to buy a new one
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Old 01 Jun 2009, 12:22 PM   #6 (permalink)
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Re: Boost Problem

I thought it might be the BOV but I have taken it off and put on a standard recirc so its not that causing the problem
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