Help (idle problems)

TJSport01 · 12-23-2007, 05:59 PM

ok i have a 2001 tj and there is a warning light on for the onboard diagnostic system or whatever and it will start and run and drive but whenever i come to a stop the rpms drop and it stalls, i have a book with symptoms and what the problem is and it says that if it idles irregularly than it is prob fuel or intake related, also when i turn it off there is like a bubling noise and i cant trace it and have no idea what it is from and also the oil pan, differential and part of the tranny look wet like there is some sort of leak im not sure if all of this is related or not but i dont know what to do

robncar · 12-23-2007, 06:03 PM

Do you know what fluid it is that is leaking?

Also, go here and pull your code(s):

http://www.jeepforum.com/forum/f9/faq-tj-error-codes-23788/

TJSport01 · 12-23-2007, 06:07 PM

its not a check engine code so i dunno if that applies, and i dont know what the fluid is it might just be a not tight enough oil pan screw, there is also some in the front that looks like coolant, but im not loosing coolant so i dunno

**Jerry Bransford** · 12-23-2007, 06:11 PM

A bad idle is commonly caused by a dirty Idle Air Controller. Mounted at the 12 o'clock position on the throttle body when looking at it from the driver's side fender, remove it and gently clean its plunger and hole the plunger fits into with a brush and throttle body cleaner. It's held on by two small torx head bolts.

If it's not that, it is likely the throttle position sensor that needs replacing. That is mounted at the 3 o'clock position and is easily replaced after undoing its two small torx bolts.

TJSport01 · 12-23-2007, 06:11 PM

ok so i did that test to get the code and it said P 0123 so my guess is that is 123 which is throttle position sensor voltage high, once again i have no idea what that means any help is much appreciated

**Jerry Bransford** · 12-23-2007, 06:15 PM

Quote:

Originally Posted by diverdude2890

ok so i did that test to get the code and it said P 0123 so my guess is that is 123 which is throttle position sensor voltage high, once again i have no idea what that means any help is much appreciated

The TPS (see above) gets dirty inside and when it does, it causes an eratic idle or RPM at various throttle settings. It can be replaced for under $50 in five minutes.

TJSport01 · 12-23-2007, 06:19 PM

ok where is the throttle position sensor, just like a general description, prob right next to the throttle body thats my guess atlest

robncar · 12-23-2007, 06:24 PM

3 - SENSOR, Throttle Position 04874371AC

4 - MOTOR, Air Idle Speed 04874373AB

From:

http://www.trademotion.com/partlocator/index.cfm?siteid=214358

Item Number * MSRP * Core Price * Price
4874371AC * $79.60 * $0.00 * $64.46

Item Number * MSRP * Core Price * Price
4874373AB * $104.00 * $0.00 * $83.70

TJSport01 · 12-23-2007, 06:38 PM

ok thats great one last thing i did throttle body spacers and air intake so could that have affected this at all its been in for about 2 months

TJSport01 · 12-23-2007, 06:40 PM

also is there any way to tell if the pieces need to be replaced by looking at them, and how are they removed?

**Jerry Bransford** · 12-23-2007, 06:42 PM

Did you miss post #4 above?

TJSport01 · 12-23-2007, 06:46 PM

**** my bad it makes sense now your the man

TJSport01 · 12-23-2007, 08:14 PM

ok so i cleaned the idle air controller with carberatour cleaner thats all i could get a hold of i also cleaned the throttle body because it was filled with alot a crum when i put it all back together it would start and then idle really high nearly 3,000 rpms so yeah more help please

**Wheelin98TJ** · 12-24-2007, 07:16 AM

You have a vacuum leak.

When you reinstalled the throttle body, you must not have tightened it all the way down or it must not be seated properly.

Quote:

Originally Posted by diverdude2890

ok i have a 2001 tj and there is a warning light on for the onboard diagnostic system or whatever...

Quote:

Originally Posted by diverdude2890

...its not a check engine code so i dunno if that applies...

So do you have a check engine light or not?

robncar · 12-24-2007, 08:26 AM

Quote:

Originally Posted by Wheelin98TJ

...So do you have a check engine light or not?

He threw a P0123 - Throttle position sensor voltage high...

but wasn't able to clean the TPS, only the IAC. Now, a vacuum leak.

We might be losing the patient, Luke, able to help this one, not...