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

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

just a thought but whats your timing at idle looking like,maybe its too advance at idle.

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.

My timing should not have changed by swithing TB's, yes? I was at perfect idle before professional tune. What should I be seeing?

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..

No but did it lower the idle?

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.