98 gt running like crap !

Discussion in '96-04 - 2V Specific' started by Jackinyourbox, Aug 31, 2016.

  1. Jackinyourbox

    Jackinyourbox New Member

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    I own a well maintained 98gt with 35000 miles . I just installed pi cams and intake and new ngk plugs about 50 miles ago . It ran fantastic ... For 50 freaking miles ... Now it sputters on take off . And when I go WOT it sputters so bad it sounds like a damn machine gun .and makes a puffing sound at idle . And definitely don't have the power I once had . It's Embarrassing .No check engine light is on or any other light . Here are the things I did in hopes of fixing the problem .
    -new fuel filter
    -new cool packs
    -new spark plug wires
    -all injectors are running (maybe one is plugged up idk)
    -no gas odor coming from exhaust
    -fuel pressure is at 32psi with key on 30psi running
    -starts up fine no problems .
    Been struggling with this for a damn week!
    Many help would be appreciated .
    thanks
     
  2. PinkieT

    PinkieT Well-Known Member

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    Vacuum leak?
     
  3. 96blak54

    96blak54 Legend

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    PinkieT makes alot of sense. The computer cant pick up a vac leak.

    Here is my suggestion. Go unplug the maf and then take it for a drive. Report back.
     
  4. Jackinyourbox

    Jackinyourbox New Member

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    I'll give that a shot tomorrow and get back .
    thanks
     
  5. Nighttrain

    Nighttrain Well-Known Member

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    Great suggestion guys, thats exactly what i was thinking when i read he did a pi swap. One other thing, did you tune it? Try unplugging the battery for 30 min to clear and reset.
     
  6. Frank.JD.Perez

    Frank.JD.Perez Well-Known Member

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    I'm just here for comic relief... I would be freaking out if it sounded how you described but then again my misfire issue was kinda similar
     
  7. Burninriverdiver

    Burninriverdiver Well-Known Member

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    I had similar issues after doing my pi intake and cam swap and the guys above are leading you in the right direction. Mine turned out to be several vacuum leaks... Check all those plastic vacuum lines (they tend to crack if you breathe on them too hard) and really check the rubber hose that plugs into the back of the throttle body/plenum, mine was dry-rotted and cracked causing a major leak. Good luck and let us know what you find
     
  8. Jackinyourbox

    Jackinyourbox New Member

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    Ok guys . Didn't have time to do much to night . And no nighttrain it isn't tuned. I did start it up and it has gotten ad enough and triggered my check engine light and it was the P0300 code . Random or multiple misfire , which I guess a vacuum leak can cause . I did start checking some vacuum Lines . The one coming out of the plenum isn't to bad . End of line is showing some small signs of dry rot . Started spraying carb cleaner over some lines. But didn't get a rise in rpms. I guess I'll check plugs and more lines tomorrow .ugh . Fml
     
  9. Jackinyourbox

    Jackinyourbox New Member

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    Didn't have time to get it out for a ride with maf unplugged . What would I notice from that ?
     
  10. lwarrior1016

    lwarrior1016 Moderator Staff SN95 Supporter

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    Do you have a compression gauge? Maybe the cam timing is off, or the cam sensor is bad.

    When you pulled the timing cover for the swap, was the tone ring (reluctor ring) behind the crankshaft sensor in good shape? Sometimes they get play in them or break and cause funky timing/running issues.
     
  11. 96blak54

    96blak54 Legend

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    Car goes into safe mode with fuel and timing. In other words, itll run rich. A jacked up maf sensor can cause higher rpm issues like you describe.