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95 trans am running like crap :(

This is a discussion on 95 trans am running like crap :( within the LT1 forums, part of the Vehicle Specific category; i need to figure out whats wrong before i got tearing farther into car. For some reason the car is ...

  1. #1
    Lt1/m6 driver :P Toyota h8r's Avatar
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    1992 Trans am

    95 trans am running like crap :(

    i need to figure out whats wrong before i got tearing farther into car.

    For some reason the car is showing lean condition sometimes on passenger side of motor, while drivers side is running tad rich.

    another issue, if accelerating at 90& throttle, the car will accelerate up to redline no problem....just like stock. Now, when when 100% throttle is applied the car coughs and stutters like its missing horribly

    for a while the passenger manifold glows red hot after driving hard.....thing is it only glows from number 6 cylinder back

    also, im using datamaster for watch the info on car and nothings jumping out as serious wrong......

    weird thing is it will lose PCM signal time to time and also the computer isnt seeing a water temp(reads -40 degress all the time) the e-fans wont come one by themselfs anymore so i had to manually wire them to come on.

    i have checked all the grounds and they are good conditon. So do i have a bad computer or bad fuel pump/injectors?

    CLIFF NOTES:
    90%throttle acceleration = runs a bad to the bone
    100% throttle acceleration = runs like a blown up honda civic
    Last edited by Toyota h8r; 10-14-2008 at 10:53 AM.

  2. #2
    Now in Summit LT1 Flavor! Y2KArcticSS's Avatar
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    Quote Originally Posted by Toyota h8r View Post
    i need to figure out whats wrong before i got tearing farther into car.

    For some reason the car is showing lean condition sometimes on passenger side of motor, while drivers side is running tad rich.

    another issue, if accelerating at 90& throttle, the car will accelerate up to redline no problem....just like stock. Now, when when 100% throttle is applied the car coughs and stutters like its missing horribly

    for a while the passenger manifold glows red hot after driving hard.....thing is it only glows from number 6 cylinder back

    also, im using datamaster for watch the info on car and nothings jumping out as serious wrong......

    weird thing is it will lose PCM signal time to time and also the computer isnt seeing a water temp(reads -40 degress all the time) the e-fans wont come one by themselfs anymore so i had to manually wire them to come on.

    i have checked all the grounds and they are good conditon. So do i have a bad computer or bad fuel pump/injectors?

    CLIFF NOTES:
    90%throttle acceleration = runs a bad to the bone
    100% throttle acceleration = runs like a blown up honda civic
    I have an LS1...but I did have similar trouble with the codes...mine would go back and forth rich or lean codes....exhaust got real hot...100% throttle SUCKED....ended up being bad cats....don't know if that's your case or not, just giving my experience....

  3. #3
    Senior Member bigrondownhiller's Avatar
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    First you need to find why pcm is losing signal, could be bad pcm. If it is bad could be the reason for all the problems. How are the battery connections? Are you getting proper voltage?

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    M6 King Hot Black Trans-Am's Avatar
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    Bat cat. I had a 95 that did the same thing. Just put a test pipe in it. Only OBDI so no codes when you test pipe it.

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    Lt1/m6 driver :P Toyota h8r's Avatar
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    welp...there is no cat..

    i have ran never battery cables and grounds...as i thought maybe connections where bad



    i think the fuel pump maybe going out...but i cant find out out to hook up a gauge to tell me at WOT going down road like a carb'd car

  6. #6
    Now in Summit LT1 Flavor! Y2KArcticSS's Avatar
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    Quote Originally Posted by Toyota h8r View Post
    welp...there is no cat..

    i have ran never battery cables and grounds...as i thought maybe connections where bad



    i think the fuel pump maybe going out...but i cant find out out to hook up a gauge to tell me at WOT going down road like a carb'd car
    oooo, yeah. I didn't think about fuel pump....I had very similar issues as well when mine went out... Do you hear a horrible whine coming from the rear of your car?

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    Lt1/m6 driver :P Toyota h8r's Avatar
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    Quote Originally Posted by Y2KArcticSS View Post
    oooo, yeah. I didn't think about fuel pump....I had very similar issues as well when mine went out... Do you hear a horrible whine coming from the rear of your car?
    nope...its actaully quiet......and thats whats got me thinkin maybe fuel pump is going out.


    but i took it out last night and the manifold wasnt glowing this time, but still at 90% throttle ran like it did brand new. You try the same pull getting on the highway at full throttle and it accelerates, but it acts like its sputtering and coughing(think shaking)

    the 90% pass = faster to 120mph than 100%


    weird thing is o2 senosrs dont show off the wall differences....but when you watch the histogram(fuel mapping via oxygen sensors) it shows all kinda weird things. For example, the passenger side is showing lean at WOT while drivers side is rich at WOT...........
    High revving TPI........wait oxymoron?

  8. #8
    Lt1/m6 driver :P Toyota h8r's Avatar
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    327-TPI/A4
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    no one?

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    12.36@109 Red on Red WS6's Avatar
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    can you send me a cvs. copy of the datalog? Have you ever had a tune to the computer? Sounds like it might be giving problems under PE mode.
    jtb429@cox.net

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