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Microtech Calibrated TPS.. idle still high

Old 02-19-06, 12:13 PM
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Calibrated TPS.. idle still high

Ok folks. I switched throttle bodies and calibrated the LT8s acoordingly. With the dash unit. It is reading 0%. When accelerator is to the floor it reads through to 99%. Fired the car up when stepping on the gas it is reading normal.My idle is at 1380 still. NO vacuum leaks anywhere. The adjustment screw is all the way loose. Even w/ the throttle cable unhooked it is 1380. Any pointers? Thanks Garret
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Old 02-19-06, 12:44 PM
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Ur tps cal isnt your problem, take a can of "carb intake cleaner" and start spraying it around all your Vac lines, if theres a leak it will find it by raising the idel of the car when it sucks the carb intake cleaner in.


good luck
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Old 02-19-06, 12:47 PM
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just a thought but whats your timing at idle looking like,maybe its too advance at idle.
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Old 02-19-06, 12:59 PM
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Originally Posted by Spooledup300z
Ur tps cal isnt your problem, take a can of "carb intake cleaner" and start spraying it around all your Vac lines, if theres a leak it will find it by raising the idel of the car when it sucks the carb intake cleaner in.


good luck
I think it is a vac leak. I used a can of Gunk carb medic and did not get any raise when sprayed. So i took off a vac. line off the uim and sprayed did not do it. Bottom line the can I have have does not work. What should i but that will.
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Old 02-19-06, 01:01 PM
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Originally Posted by puntorotary
just a thought but whats your timing at idle looking like,maybe its too advance at idle.
My timing should not have changed by swithing TB's, yes? I was at perfect idle before professional tune. What should I be seeing?
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Old 02-19-06, 01:02 PM
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Originally Posted by G's 3rd Gen
Ok folks. I switched throttle bodies and calibrated the LT8s acoordingly. With the dash unit. It is reading 0%. When accelerator is to the floor it reads through to 99%. Fired the car up when stepping on the gas it is reading normal.My idle is at 1380 still. NO vacuum leaks anywhere. The adjustment screw is all the way loose. Even w/ the throttle cable unhooked it is 1380. Any pointers? Thanks Garret
Did you have this problem before you switch TB?
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Old 02-19-06, 01:33 PM
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Originally Posted by crispeed
Did you have this problem before you switch TB?
Nope. I just took it for a spirited drive and it ran flawlessly. I know its right. It has to be a vac. leak. What is the best stuff for vac leaks. My carb cleaner wont raise the idle when I sprayed into one of the UIM nipples..
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Old 02-19-06, 02:43 PM
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Originally Posted by G's 3rd Gen
Nope. I just took it for a spirited drive and it ran flawlessly. I know its right. It has to be a vac. leak. What is the best stuff for vac leaks. My carb cleaner wont raise the idle when I sprayed into one of the UIM nipples..
No but did it lower the idle?
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Old 02-19-06, 02:49 PM
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Checks---->
Vacume leak.
Air bypass screw.
Throttle stop screws
Last but not least if all the above pass then check the BAC valve. They are known to get stuck in the open position. I've change many of them for that very said problem. Even if you're not using it and it's disconnected they do that sometimes.
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Old 02-19-06, 07:59 PM
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Originally Posted by crispeed
Checks---->
Vacume leak.
Air bypass screw.
Throttle stop screws
Last but not least if all the above pass then check the BAC valve. They are known to get stuck in the open position. I've change many of them for that very said problem. Even if you're not using it and it's disconnected they do that sometimes.
Anyway to check the bac valve? Or replace.
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