idle problems and black smnoke
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This is a discussion on idle problems and black smnoke within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; so i just changed out the original turbo on my 03 wrx and about a month ago put a walbro ...

  1. #1
    Registered User subbi03wrx's Avatar
    Join Date
    Apr 2009
    Houston TX

    idle problems and black smnoke

    so i just changed out the original turbo on my 03 wrx and about a month ago put a walbro 255 fuel pump. i got a turbo which is the same as stock (tdo4)from a guy who parted out his car and it has aprox 30k miles on it. and after swaping the turbo my friend checked everything out with his snap on comp and it showed me running a little lean. so he loosened the wastegate to turn the boost down and now im maxing out at 10 lbs of boost and it was running fine. but after shutting it off to get food when i get back and turn it on it sounds like it has a big cam just idling rough maybe about 200 rpm. and there is black smoke comming from the exhaust. any ideas on what it can be?
    03 wrx
    cobb ap stg2
    4in dp
    sti tmic
    full exahust
    any help would be great
    No Fat H00$ car will scrape!!

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  3. #2 Vendor adam@kronosperformance's Avatar
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    Nov 2005
    Princeton, NJ
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    Black smoke would be unburnt fuel. How are your spark plugs?'s #1 Vendor! Call/Text 732-742-8837 We Offer a Military Discount
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  4. #3
    Moderator Donkey's Avatar
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    Apr 2005
    Da boonies
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    Turning down the boost by adjusting the wastegate is the incorrect way of doing it. How exactly did he determine the car was running lean? Did you guys do a WOT run?
    Resident Adviser @ WTF Tuning, LLC
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