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2G Slow acceleration

Posted by garytheberry, Jul 1, 2020

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  1. garytheberry

    garytheberry Probationary Member

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    Hey guys, I have a 1999 eclipse gst. I’ve been having this issue where the car will make plenty of boost (the gauge shows that it does and the blowoff valve will engage easily) but the car barely accelerates. By the time I get to third gear I have zero acceleration. The only time this happened before, one of the couplings for the intercooler piping was loose. I’ve looked over every hose and can’t find the issue.
     
  2. ThunderChild

    ThunderChild Supporting VIP

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    BLT, might have a bad gasket somewhere on the throttle body or intake manifold as well.
     

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  3. garytheberry

    garytheberry Probationary Member

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    To expand on the situation, the engine will rev high and make boost but just barely accelerates in first and second gear. By the time I get to third gear I’m at such slow of a speed that the car won’t accelerate at all and won’t rev either.
     
  4. CAM280

    CAM280 Supporting Member

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    BRISBANE, Australia
    Are you reving high but going no where? Could be the clutch?
     
  5. luv2rallye

    luv2rallye DSM Wiseman

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  6. Mello

    Mello Proven Member

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    Sounds like you have a boost leak. As @ThunderChild said, do a BLT. The boost gauge doesn't measure boost, it calculates it through the ECU's MAF & RPM data. Your probably sucking in a lot of air at high RPM's & blowing it out a large leak. IE: it's not a real boost gauge.
     
    Last edited: Jul 2, 2020
  7. motomattx

    motomattx Proven Member

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    Check also for a clogged catalytic converter and check that the timing marks all line up properly.
     

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    1995 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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  8. garytheberry

    garytheberry Probationary Member

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    I know it’s not a real boost gauge. Ive seen it where you can make a fitting that clamps on to the tubing just before the turbo and hook up an air compressor to it, I might try that
     
  9. pauleyman

    pauleyman DSM Wiseman

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    We are implying you must try that. It's called a boost leak test as stated above or BLT. It's very difficult to spot leaks otherwise. Any leaks the computer won't know and just happily injects enough fuel for the air it thinks is there but isn't.
     

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    1997 Eagle Talon TSi AWD
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