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98 Z28 drive-ability issues

This is a discussion on 98 Z28 drive-ability issues within the General Help forums, part of the LSx Technical Help Section category; I have a 98 Camaro Z28 LS1/6speed, 150000 miles. I have a drive-ability issues. When accelerating at mid throttle there ...

  1. #1
    Junior Member
    Join Date
    Feb 2014

    98 Camaro Z28

    98 Z28 drive-ability issues

    I have a 98 Camaro Z28 LS1/6speed, 150000 miles.
    I have a drive-ability issues. When accelerating at mid throttle there is a little power hick-up at 2500rpm, then under WOT it will not accelerate over 4200rpm. It acts like it just will not give any more. When it is out of gear it will rev through the rpm range with no problem. It is only under a load when it does this. At low RPMs it runs strong under load.
    I recently changed plugs and wires to NGK. Old plugs looked worn out but did not indicate any major issues.
    It has the following codes
    Are the codes for the o2 sensors a symptom of a different problem (fuel/air problem, bad cat, fuel pressure regulator etc ) or simply bad o2 sensors?
    Please share any ideas/hypothesis with me.

  2. #2
    Senior Member Naaman's Avatar
    Join Date
    Mar 2010

    98 Z28 Vert M6

    Well, if the secondary air is not working properly, there will be less O2 in the exhaust stream, and that seems to be a good place to start (the secondary air injection system).

    As for the flat spot at 2500, that might be a symptom of the other issues above, or it could be that your TPS is worn out on a certain spot (from being driven at that spot for the majority of it's life).

  3. #3
    Moderator 35th-ANV-SS's Avatar
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    Oct 2008
    Wherever life takes me

    02 35th LE Camaro SS

    Secondary air system only comes on when the motor is first turned over and then shuts down shortly after that. You are right in that it pumps more oxygen though. It isn't really even needed and that's why a lot of people remove it completely, myself included.

    OP - I would start by cleaning your MAF and making sure you snapped the plug wires on all the way. I'll have to look those specific codes up later.
    It's on jackstands.

  4. #4
    Junior Member
    Join Date
    Feb 2014

    98 Camaro Z28

    Thanks guys
    I'll try that and let you know

  5. #5
    Senior Member kingls1's Avatar
    Join Date
    Apr 2011

    1999 Trans-Am, 2012 Sonic

    P0137&157 could be the following. Possible bad cats, plugged exhaust, bad fuel pump. Condition will cause motor to not rev under a load. Causes could be from a contaminated maf. Fixes putting a fuel pressure gauge on and checking during driving conditions. Replacing cats. Checking pressure coming from exhaust in rear. Cleaning or replacing maf. Only after pump or exhaust problem fixed. Condition can also act like transmission problem
    P0410&415 secondary air. Probably bad fuse or pump it self. Fuse located under hood on drivers side fuse box. Pump only works on start up and should have nothing to do with above codes
    99 Trans Am, SLP Lid, Blackwing filter, smooth bellow, Ported TB, LS6 intake, Ws6 lower ram air box, OBX LT's, Magna Flow cat back, LS7 clutch, Tick MC, Hurst Shifter, Frost Tune, UMI SFC,LAC, STB, PB, Torq Arm, Super Hawk hood, Torq Thrust II, Kee Audio.
    Strange S60 4:10's, D&S Rotors, S/S Brake Lines.
    Nitto NT05R Track Tire's, 12.7 @ 108 / 1.82 60'
    Wish list.
    Coil overs, Heads & Cam

  6. #6
    Senior Member raynor139's Avatar
    Join Date
    Aug 2007
    Greensboro, NC

    2002 Trans Am WS6 M6

    My guess would be bad cats mine did the same when my driver side one went bad. If you dont need the air system for emissions then pull it most of us have already that can get away with it.
    Mods - Lid, Skip Shift Eliminator, MGW shifter, UMI SFCs, Founders Lower Control Arms, Founders Panhard Bar, Founders Adj. Torque Arm, UMI Torque arm mount, MWC Drive shaft safety loop, KONI Yellows, Strano Springs, Strano Sway bars, UMI Upper and lower A Arms, 160 thermostat, TSP headers and TSP true duals Monster stage 2 clutch, racetronix fuel pump, Strange S60 rear axle and tune by Frost.

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