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problems with sts turbo

This is a discussion on problems with sts turbo within the Forced Induction forums, part of the LSx Technical Help Section category; http://i78.photobucket.com/albums/j1...ock/jim071.jpg can any one explain this. a lean plug, but yet its so rich it dosnt make any power....

  1. #21
    Junior Member crazycat's Avatar
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    95 z28 convertible

    http://i78.photobucket.com/albums/j1...ock/jim071.jpg

    can any one explain this. a lean plug, but yet its so rich it dosnt make any power.

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    87 Buick GN

    Do you have an adjustable fuel pressure regulator?

  3. #23
    Junior Member crazycat's Avatar
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    Quote Originally Posted by Forcedinductiontech View Post
    Do you have an adjustable fuel pressure regulator?
    no I dont , pressure @ idle is about 42 psi @ w.o.t it is 50 psi.

  4. #24
    Junior Member crazycat's Avatar
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    anybody ? I was thinking maybe a air leak..

  5. #25
    Member cailey37's Avatar
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    Check your PCV valve and make sure you're not pressurizing your crankcase...I elminated mine and just went with a one way valve in a catch can....if you get blow-by in the motor it could blow the oil thru the throttle body and cause your motor to burn lean.......

  6. #26
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    Sounds like you need to check your LTBLMS and STBLMS in the PCM with a scanner. They may be adding way too much fuel at cruise, creating a multiplier, and when you go to WOT, then the PCM uses the largest multiplier (figured cruise v/s PE Modifier). If you're dumping a bunch of fuel at cruise to keep the afr correct, then it's gonna do the same at WOT! Check the blems, if they are way off, your dyno guru should be able to move your VE tables to get the cruise correct for you. You want to be subtracting fuel during cruise, not adding, that way you can always controll the WOT A/F using the PE multiplier.

    The main reason that this could be happening is if the turbo is sending alot more air at cruise than what the engine is used to seeing at that rpm. I'd imagine with 4:10 gears, your cruise RPM's are pretty high, and it should be turning the turbo a pretty good bit.

    Just a thought.

    Moss

  7. #27
    Junior Member crazycat's Avatar
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    Thanks for every ones input. brian @ pcm for less still has my computer trying to figure out what is going on. He thinks that the pcm is bad or he said that more than likley it's the optispark. he said that it acts like it just drops the spark. I have a new pcm on the way to him now. But if the optispark was bad wouldn't I notice it, or not ? the car seems to run smooth. But when you nail it it seems to bogg. He said that my computer is programed with the same amount of fuel as lot of other and there a/f mix is good.

  8. #28
    Member koolaid_kid's Avatar
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    Arrest Me Red
    1997 Formula

    Have you checked your intake pipe from the turbo to the tb? Mine leaked until it was welded up. It showed boost, but not much increase in power. After welding, watch out.
    Best of luck.

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