ok so i just bought a new iac and installed it at 8:30 at nite cause the truck was idling at 1500 when warm so i got a new one....so i put it on and the truck is cold so i dont know forsure if its working but i read someware that if u pull the plug going to it and the motor stalls or runs differently it is working so after i installed it i started it up and pulled the plug and nothing happened.....what does this mean.

 

come on anybody....did i just spend 77.99 for nothing

 

bump

 

You either have a vacuum leak somewhere, or somebody has screwed with the throttle plate position, which throws off the TPS idle position voltage.

 

how would i get the tps screw back to normal?

 

Give this a try: Connect a voltmeter to the TPS. + lead on the gray/white wire, and - lead on the brown/white wire. Turn ignition to the "RUN" position, and adjust the throttle plate stop screw until you measure 0.9V (900mV).

After doing this, and since you have replaced the IAC, the PCM needs to be reset. You can do this by turning your headlights on, and then disconnect the negative battery cable for a few seconds.......

 

When replacing the IAC, this should be step number one. Plus you need to put it through the idle learn process. (do a search and you'll see how to do it)

Rich

 

is your thermostat sticking open and not allowing your truck to warm completely up mine did this and once i put a new stat in it worked fine.

 

no it warms up fine and it seams that if the car is warm and i unplug it it will start to die but tf its cold it wont do anything.i'l deff do that headlight thing.....also the little cap on the iac seems to suck a lot of air and make a whistle....sometimes.....

 

ok so when i hooked up my multimeter it read -3.76 unplugged and -4.23 plugged in and to get it to read -.9 (im guessing he had the wires listed backward) i would have to push the throttle to almost full. wtf?

 

b ump

 

come on im in the middle of trying to figure this out....whats going on.

 

It sound like yout measuring between the sense wire, and +5V. Move your - lead to the 3rd wire you haven't probed yet.....

 

no when i plug on that one its -5.1 to -5.0......the 4.23 changes when i turn the throttle by hand and at full throttle its at like -.68 or somthing...its like its backwards.

 

If your measuring -5.1 to -5.0, your measuring between GND, and +5V, with your + lead on GND, and - lead on +5V.With this condition, switch the leads so your measuring +5V. When you have this, move the + lead to the 3rd wire, and this should be correct.

 

ok so i got it working (had to ground on metal and pos on the gray and white wire....set it to .96. then i did the headlight flash one and then the 5 min flash and the cysles of ac. idle relearn. so now it feels like it runs better with better throttle responce but it idles at like 1600 to 1800 so if i cant figure any thing else out im unscrewing that screw till its at about 800

 

bump

 

Make sure you have close to 0V and 5V (WRT negative battery terminal).

 

i dont get it. what does wrt mean

 

With Respect To ....Tie your - lead to the negative battery terminal

 

well today i turned it pack so its not touching and it idles at like 8-900 instead of the 1800-1900 when i had it adjusted "right"