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Idle Problem

This is a discussion on Idle Problem within the General Help forums, part of the LSx Technical Help Section category; When I first got the car, it had an idle problem. I added the LS6 intake and Shaner P&P TB ...

  1. #1
    Evr sena bdgr killa snak? Roastem's Avatar
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    '99 Z28 M6

    Idle Problem

    When I first got the car, it had an idle problem. I added the LS6 intake and Shaner P&P TB and it idled absolutely perfect, cold or warm. I put the cam in it, and now it idles strangely when cold, almost cutting off, and going up and down from 200 to 700 rpm. When it is warm, it runs fine, but still not consistent. What is the best fix for this problem? I have heard I need to drill the breather hole on the TB blade. Anybody got any recommendations on what size to drill the hole? The hole is the stock size right now.
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    Story of My Life!! BIG D's SS's Avatar
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    I think that Mine was about an 1/8 inch hole.

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    Evr sena bdgr killa snak? Roastem's Avatar
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    Quote Originally Posted by BIG D's SS
    I think that Mine was about an 1/8 inch hole.
    Did it idle perfect after that, or does it still act up a little?

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    Story of My Life!! BIG D's SS's Avatar
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    Quote Originally Posted by Roastem
    Did it idle perfect after that, or does it still act up a little?
    Normally all of those cars when you first crank them will act a little funny then it will be fine. I saw a Carl Black T/A with a head and cam package done by GMMG and it acts a little funny when you first crank it. I think it is just hte nature of the Beast.

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    Senior Member SeVeReDiStOrTiOn's Avatar
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    get a tune

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    Evr sena bdgr killa snak? Roastem's Avatar
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    Quote Originally Posted by SeVeReDiStOrTiOn
    get a tune
    Had it tuned already. About a week or two ago. The A/F ratios looked perfect. (from 2500 on anyway)

  7. #7
    Story of My Life!! BIG D's SS's Avatar
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    When it warms up what does it idle at. MIne with the cam idles about 900-1000. Might have to adjust teh idle screw up a little or the butterfly drill mod.

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    It idles at 600. I thought that was a bit low. I could fix that by adding a shim to where the throttle stop rests. I might try raising the idle to about 800, and see if that helps.

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    I took my new T/B off yesterday to adjust the idle screw, and noticed there was a significant amount of oil film on the inside of the intake, and there was some on the rear of the throttle blade. Is it supposed to be like that? It does consume about a quart a month. Oh yeah, that cured my idle issue, adjusting the screw. Thanks Big D.

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    Story of My Life!! BIG D's SS's Avatar
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    Quote Originally Posted by Roastem
    I took my new T/B off yesterday to adjust the idle screw, and noticed there was a significant amount of oil film on the inside of the intake, and there was some on the rear of the throttle blade. Is it supposed to be like that? It does consume about a quart a month. Oh yeah, that cured my idle issue, adjusting the screw. Thanks Big D.
    Glad that I could help you out. Sounds like that you have some blow by. Mine si the same way. If you do what Rob done and do away with the pcv valve with a breather and get away from the oil going back into the intake that will help some. How many miles is on the car? Mine is about the same way.

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    Quote Originally Posted by BIG D's SS
    Glad that I could help you out. Sounds like that you have some blow by. Mine si the same way. If you do what Rob done and do away with the pcv valve with a breather and get away from the oil going back into the intake that will help some. How many miles is on the car? Mine is about the same way.
    About 92000 miles. I should be looking into rebuilding that engine. It would be cheap to go back stock, new forged pistons and ARP rod bolts, and leave the stock rods and crank. Or I could spend a lot of cash and stroke it to the max with forged components. I don't know if the cost will justify the amount of power increase.

  12. #12
    Story of My Life!! BIG D's SS's Avatar
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    Quote Originally Posted by Roastem
    About 92000 miles. I should be looking into rebuilding that engine. It would be cheap to go back stock, new forged pistons and ARP rod bolts, and leave the stock rods and crank. Or I could spend a lot of cash and stroke it to the max with forged components. I don't know if the cost will justify the amount of power increase.
    We are both in the same boat. About the same miles. SO I'm gonna rebuild mine back forged stock and save for a 402 stroker.

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