running out of idea boost vacuum issues
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This is a discussion on running out of idea boost vacuum issues within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; so i don't know where to go from here. my car was not boosting and had vacuum surge when idling. ...

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    running out of idea boost vacuum issues

    so i don't know where to go from here. my car was not boosting and had vacuum surge when idling. so i went through and replaced and inspected all the vacuum hoses, tested the bcs and seem to work fine. now after changing all the hoses its still not boosting and it wont idle when its up to temperature.

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    Subaru Newb MainFrame's Avatar
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    Model? year? mods? when did this start happening?

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    02 wrx wagon, injen ses turbo back exhaust, koyorad radiator, gfb blow off valve. it had been runnin sluggish for about a month, then i had the 105k maintenance done about 2 weeks ago and thats when the idle issues got worse

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    Good news, everyone! xxxxxxxAnub1s's Avatar
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    Is your BOV known to be good, as in not leaking? Is your car tuned at all?

    Have you tried resetting the ECU to see if the problem is consistent?
    Cody
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    i havent done any tuning on it. but it dont know if the previous owner did or not. stupid question but how do i reset my ecu. im setting up to run a leak test tonight

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    Good news, everyone! xxxxxxxAnub1s's Avatar
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    I would definitely look into your BOV, a leaking one can cause all kinds of problems; which is one of the main reason we all recommend using the stock BPV until you are FORCED to go aftermarket.

    To reset your ECU, remove the negative cable from the battery, let it sit for a few minutes, (turn on lights to discharge the system if you have an aftermarket stereo with a capacitor), reattach, and start the car. Note that when you reset the ECU, the car goes through a learning period that lasts a couple of drive cycles, so it may not seem like it's performing at it's peak for bit.
    Cody
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    ok ill give it a shot. yea it was installed by the previous owner, so if the bov is bad would it be worth it to go to an aftermarket bpv? and if i did would this require it to be retuned. didnt have the right parts to do the pressure test so ill have to give a try tomorrow

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    Good news, everyone! xxxxxxxAnub1s's Avatar
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    If it's bad, just buy a stock one. There is absolutely no need to have an aftermarket pressure relief with the modifications you have. All you have there is a noisemaker.
    Cody
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    Oh its something shiny too look at too. Thanks for the help man

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