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rough idle at start up

This is a discussion on rough idle at start up within the General Help forums, part of the LSx Technical Help Section category; I just rebuilt my ls1 and at start up the idle is around 250-500rpm. After about 10 seconds it finds ...

  1. #1
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    2001 Firebird Trans Am

    rough idle at start up

    I just rebuilt my ls1 and at start up the idle is around 250-500rpm. After about 10 seconds it finds normal idle. What do I need to do?

    -2.5 5.3 heads
    -TQv2 cam 114 LSA
    -Pace LTs
    -3" y pipe
    -37lb injectors
    -Gutted stock MAS
    -LS6 oil pump and timing chain
    -LS6 intake manifold
    -Stock TB
    -Texas Speed computer tune
    Last edited by 2001TransAm; 08-03-2009 at 01:05 PM.

  2. #2
    Veteran Hi-Po's Avatar
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    1999 TA WS.6

    Probably a better tune.

  3. #3
    Senior Member bills98ta's Avatar
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    1998 Trans Am

    Maybe open the TB idle screw some.

  4. #4
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    2001 Firebird Trans Am

    I was thinking of doing that but the idle if fine after about 10 seconds. I will try it anyway. Anyother possible ideas?

  5. #5
    Senior Member bills98ta's Avatar
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    1998 Trans Am

    The idle control motor might be maxing out, so that might help.

  6. #6
    King 0f n00bz shady milkman's Avatar
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    blacker than wesleysnipes
    98' trans am

    +2 for a better tune.

  7. #7
    Veteran Hi-Po's Avatar
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    If you have access to HP Tuners, You could look at your IAC motor and see what the counts are. If I remember correctly they need to be between 45-65 at hot idle. This is directly related to your tune more then likely, and why a mail order for a cam/head swap just will not suffice usually. I bet TSP has sold hundreds of these and know what the tune should look like, but they cant nail down little problems like this. Thats where either A) tuning over email with both parties owning HPT and you owning a wideband or B) getting a decent tuner to take a look at your situation would have worked better.
    Last edited by Hi-Po; 08-04-2009 at 09:19 AM.

  8. #8
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    2001 Firebird Trans Am

    A better more fine tune is what im thinking to, I live in northwest Arkansas and looking for a tuner for a decent price. Thanks for the help

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