i got in my car this morning and noticed very quickly that my idle is about 1200 in park. then i put it in gear and go down the street and it is at 1000 in gear. this is very unusual for me. the car is normally at about600 all of the time. any ideas what has caused this? i had the throttle body off about a week ago and cleaned the IAC. I might try to unplug my battery for a fwe minutes then hook it back up or something. im not getting any codes either.
thanks

 

ok, does anyone know what this means? it is at its high idle again. i unplug the IAC and nothing happened at all. does that meant that the IAC is bad? i turned the idle screw to lower the idle so im not banging it in and out of gears real hard, but it still isnt normal right now. does anyone have any info?

 

you turned down the throttle stop? Not the right thing to do, you may have caused more problem than solved.

Go to the main thirdgen.org page, and look in the technical articles, and look for the "how to adjust idle" category

 

ok, i set the IAC as directed in the tech article. so that threw my TPS off some so i also set that. i went and scanned the codes and it said something about coolant temp switch and mat was too low. i remember it was code 14, 15 and then the mat code. does this mean that my coolant temp switch is malfunctioning? also i noticed when i go to WOT very fast that my TPS isnt getting any readings. it just goes to 0.00. I am guessing that this means my TPS is also bad?

any help?

 

What happens if you slowly go to WOT? Is it ok then? Strange.... The temperature sensor could be very well your culprit, cause the ECM may be thinking the engine is still cold, when is it actually hot, thus, it could be staying in open loop. Change the temp sensor, or check the resistance of it when the engine is at operating temperature. I have a chart that tells what temperature gives a certain resistance.

 

yes...if i go slow to wot then the readings go up, but when i go fast they just read 0.00

 

hmmm.... I don't know what to say to that, wheres the other guys on this board?? Do you have access to a ohm meter to measure the resistance of the temp sensor at Operating Temp?

 

yeah, i have access to an ohm meter, but im not sure if the temp sensor is bad or not. the scanner was reading that the car was in closed loop and that the coolant was 185* the weird thing is that when im driving my gauge will start acting weird like bouncing around some, then going to zero back up to like 180 and stuff like that. i think im just gonna replace the gauge anyway. it is prolly the origianl gauge. i might replace the TPS while im at it if it isnt too expenxive.

 

What was the original purpose for removing the throttle body? If the idle was working when you removed it, it should be working now. Check to make sure you didn't loosen one of the other sensors connectors when you removed the TB. You say you setup the idle. Check the voltage on the TPS. I think it suppose to be .65 volts with throttle closed. If not, loosen the screws and adjust the TPS for proper voltage.

 

i took it off to install my nitrous plate. i just thought about it and it was 2 weeks ago. the car ran perfect as usual for those two weeks, and today when i got in it it ran like crap.

 

If you have removed the NOS bottle, make sure the hose to the nitrous plate is plugged. If not it is sucking access air that the IAC can't compensate for. Hopefully the hose hasn't got a hole burned in it.

 

the wires on the TPS were smashed undernieth of my fuel rail back by the lower intake and had worn through and grounded themselves which is why my TPS was reading 0.00. i now have it set at .6 volts and it goes up to 4.50 at WOT. i also set the IAC and it idles at 600 rpm in drive. thanks for the help guys. luckily i noticed when i wiggled the wires i would get some numbers and then just searched for my problem

 

thanx for letting us know you found the problem... way to go dood!!