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  • #1

    Newbie with a question

    Ok, first of all hello everybody, I'm new here so take it easy on me
    I got a 98 TA, auto and when is cold outside or the car is cold and I start it, it will idle rough and sometimes if not all, it will stall, after it warms up everything's fine. What do you people think?
    Has anybody experienced this before?
    Thanks!!
    Oh yeah, what motor do I have, LS1 or LT1? Sorry I know that's a dumb question, but I'm new to these cars
    Tags: None
  • #2
    Re: Newbie with a question

    Originally posted by Birdkrap
    Ok, first of all hello everybody, I'm new here so take it easy on me
    I got a 98 TA, auto and when is cold outside or the car is cold and I start it, it will idle rough and sometimes if not all, it will stall, after it warms up everything's fine. What do you people think?
    Has anybody experienced this before?
    Thanks!!
    Oh yeah, what motor do I have, LS1 or LT1? Sorry I know that's a dumb question, but I'm new to these cars
    LS1.

    IAC (Idle Air Circuit) I have seen this on all types of cars. For some reason they get carbon in them and die. I have taken them apart and cleaned them and they have worked fine for years. I just had one last a month after cleaning and die again.
    2002 Electron Blue Vette, 1SC, FE3/Z51, G92 3.15 gears, 308.9 RWHP 321.7 RWTQ (before any mods), SLP headers, Z06 exhaust, MSD Ignition Wires, AC Delco Iridium Spark Plugs, 160 t-stat, lots of ECM tuning

    1995 Z28, many mods, SOLD

    A proud member of the "F-Body Dirty Dozen"

    Comment

    • #3
      Welcome!!

      Your 98 T/A has the 346 cubic inch, all aluminum LS1 engine.

      Not sure about the rough idle.... SES light on? Blinking? .... that is a sign of misfire detection.

      I know on my 2001 Silverado with the 4.8L LS1-derived engine, the idle seems a little rough at times. I put AutoTap on it, and there were no misfires. It seems like they are trying to control the idle by playing with the spark timing, and thats what feels like a misfire, but isn't. Not sure how that compares to the car engines.... the truck has the "fly-by-wire" throttle, so it might respond a little differently than the F-Body LS1 with its traditional throttle cable.
      Fred

      381ci all-forged stroker - 10.8:1 - CNC LT4 heads/intake - CC solid roller - MoTeC engine management - 8 LS1 coils - 58mm TB - 78# injectors - 300-shot dry nitrous - TH400 - Gear Vendor O/D - Strange 12-bolt - 4.11's - AS&M headers - duals - Corbeau seat - AutoMeter gauges - roll bar - Spohn suspension - QA1 shocks - a few other odds 'n ends. 800HP/800lb-ft at the flywheel, on a 300-shot. 11.5 @ 117MPH straight motor

      Comment

      • #4
        So I got an LS1? kool!!
        No, the SES light doesn't come on, I guess I'm gonna have to take the IAC off the car and clean it. Is that a good idea?
        Thanks for the responses

        Comment

        • #5
          Originally posted by Birdkrap
          So I got an LS1? kool!!
          No, the SES light doesn't come on, I guess I'm gonna have to take the IAC off the car and clean it. Is that a good idea?
          Thanks for the responses
          I have a friend that works at a dealership and they do it all the time. They have a code just for it. I use Auto Zone carb cleaner. Man that's good stuff. Also spray it in the throttle body where the IAC goes.
          2002 Electron Blue Vette, 1SC, FE3/Z51, G92 3.15 gears, 308.9 RWHP 321.7 RWTQ (before any mods), SLP headers, Z06 exhaust, MSD Ignition Wires, AC Delco Iridium Spark Plugs, 160 t-stat, lots of ECM tuning

          1995 Z28, many mods, SOLD

          A proud member of the "F-Body Dirty Dozen"

          Comment

          • #6
            Originally posted by Jeff 95 Z28
            I have a friend that works at a dealership and they do it all the time. They have a code just for it. I use Auto Zone carb cleaner. Man that's good stuff. Also spray it in the throttle body where the IAC goes.
            I remove mine and clean it as part of the tune up process every spring. it's a piece of cake.
            Tracy
            2002 C5 M6 Convertible
            1994 Z28 M6 Convertible
            Current Mods:
            SLP Ultra-Z functional ramair, SS Spoiler, STB, SFCs, Headers, Clutch, Bilstein Shocks, and TB Airfoil. 17x9 SS rims with Goodyear tires, 160F T-Stat, MSD Blaster Coil, Taylor wires, Hurst billet shifter, Borla catback with QTP e-cutout, Tuned PCM, 1LE Swaybars, 1LE driveshaft, ES bushings, White gauges, C5 front brakes, !CAGS, Bose/Soundstream audio, CST leather interior, synthetic fluids

            Comment

            • #7
              Ok, I guess I'm gonna clean the IAC and I'll post back to let you all know what happened. Oh, I almost forgot, will I need any gaskets or anything besides the cleaner, can I reuse the same gasket?

              Comment

              • #8
                Originally posted by Birdkrap
                Ok, I guess I'm gonna clean the IAC and I'll post back to let you all know what happened. Oh, I almost forgot, will I need any gaskets or anything besides the cleaner, can I reuse the same gasket?
                I've allways re-used the old one when there is a paper one but if LS1 is the same as the LT1 there isn't one. There is an O ring on it. http://shbox.com/1/iac3.jpg
                2002 Electron Blue Vette, 1SC, FE3/Z51, G92 3.15 gears, 308.9 RWHP 321.7 RWTQ (before any mods), SLP headers, Z06 exhaust, MSD Ignition Wires, AC Delco Iridium Spark Plugs, 160 t-stat, lots of ECM tuning

                1995 Z28, many mods, SOLD

                A proud member of the "F-Body Dirty Dozen"

                Comment

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