jkm1987

For a couple months my car has been acting as if the IAC valve is worn out ( diving idle in nuetral, idle hang at 1100rpm, dying in nuetral etc..) so i replaced it yesterday now the idle hangs at 1400rpm and is still diving when i slow down in nuetral. I dont guess the IAC valve is the problem any ideas?

monkeydude3

check your mass air flow sensor and make sure all your intake connectors are good and also check for a vacuum leak

jkm1987

i just talked to my mustang shop and he said i need to adjust the tps to 1.0 volts??? what does that mean he sounded like he was in a hurry so i didnt ask

monkeydude3

yeah you will need to set the TPS throttle position sensor. You need to set it to the factory spec for 'idle' which is a 1v signal.

jkm1987

how do i do that?

monkeydude3

okay there should be three wires coming off of your TPS. I'm not sure which is which, the colors change all the time. One will be ground, one will be a 5V (or close to it) reference, and the other will be the signal. Turn key on, engine off. Find the one that is the reference, it will be drastically less than 5V. Loosen the two screws on your TPS and turn it until that reference gets close to 1 volt. Right now it could be a bit high, telling the computer you are on the gas when you aren't.

jkm1987

thanks alot man i really appreciate it

monkeydude3

no problem. Some engines don't like the TPS voltage being off, others dont' care. If you don't have an adjustable TPS, it may need to be replaced.

Feel free to drop me a line any time too

Dan04COBRA

Are you using MIL Eliminators?

My idle would surge and hang like crazy. Eventually my MIL's failed and the car went back to normal, minus the CEL for them failing. Pieces of crap.

jkm1987

no im not using MILS i just have them turned off with diablo sport