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running lean ??

This is a discussion on running lean ?? within the LT1 forums, part of the Vehicle Specific category; i have a 1994 trans am about 6 months ago my car was running wierd once it had warmed up. ...

  1. #1

    running lean ??

    i have a 1994 trans am about 6 months ago my car was running wierd once it had warmed up. i replaced the 02 sensors and it ran fine till yesterday. once the car warms up (roughly 20 min of driving) it starts missfiring and throws a engine light on... i had the computer scanned at a buddies and its throwing codes 44 and 64 which is the 2 02 sensors and it says they were picking up a lean mixture... now my question is could this all be due to the reason i cut out my catalitic converter and dont have a 3rd 02 sensor ? i didnt think it mattered on a 94

  2. #2
    Junior Member
    Join Date
    Jul 2006
    Have you checked for any exhaust or intake leaks....sounds like you might have some unmetered air getting into the engine or exhaust system

  3. #3
    it only seems to happen after 20-30 min of driving ... could this still be an intake or exhaust leak ?

  4. #4
    Fayhee Motorsports hotrod18_69's Avatar
    Join Date
    Nov 2005
    Kingman, AZ

    Sebring Silver
    97 Camaro Z28

    No it wouldn't matter that the cats gone.. Have you checked the fuel pressure yet? and ideal and at WOT to see if it drops off under a load.. Could be a bad fuel pump or maybe the ground next to the batt.. not letting enough votage to the pump.. All something to check..
    97 Silver Z28
    T-56 Conversion, OBDII to OBDI Conversion, Stock bottom end 11.0:1, CC306, Stock ported heads by me, Hooker LT's, Borla Cat-back, MSD DIS 4 w/Delteq, 4:10's, and much more.
    Best E.T.: 12.78 @ 111 w/2.03 60"

  5. #5
    Member Chad97z's Avatar
    Join Date
    Aug 2005
    Dallas / Irving
    if you have a custom program in the computer, I'd set it back to original then clear the codes, then rediagnose your problem. (Unless you have hypertech programming - I know they dont mess with fuel mixture at normal operation)

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