Help Annoying Idling Problem

[GreenChevelleSS]

well ive got an idling problem with my car.
The car idles fine when stopped but when driving and then getting on it a little bit then letting off and pushing in the clutch the car will idle down so low it dies sometimes it will catch its self and idle up.
When cruzing the car will start idling at 2000+ RPMs and gets really annoying cause when I go to shift the car will take off but it doesnt do this all the time but does it alot.

Any help?

 

[Silent Smith]

you could have a vacuum leak, could even be bad gas.

If I push in my clutch while the car is warming up the rpms go down maybe 200rpms

How long has this been happening for? Done anything recently to it?
Happens all the time or duing a hot start?

 

[GreenChevelleSS]

I dont think its a vacume leak cause I pulled a vacume hose off and the car started running funny then and the vacume was real strong. I also dont hear any leaks.
Most of the time i notice it is when its cold. I have to drive about 5-6 miles to go to school and it does it all the way there. But i dont drive many other places

 

[rakkasan]

any codes? Symptoms sound the same as the TPS troubles I had

 

[GreenChevelleSS]

I havent checked them, how do you?
I was thinking a while ago that i need to

 

[cruzinbill]

http://www.cygnusx1.net/supra/techtip/engineerrorcodes.html
Courtesy of sheaffs signature

 

[??supra]

i have the same problem but more when the car is warm. whats the deal with that?

 

[garagefujimoto]

Things such as leaky intake gaskets, intercooler pipes, hose clamps, cracked vaccum lines and malfunctioning bov's will cause the idle to drop way down and then stumble back up upon decleration. Any air leak will cause a rich condition on decelaration, making it hard to idle.

 

[solid400]

I had very similar problems with my car, turned out the EGR was bad, my fix, took the vacum line off the EGR, the one coming from the throttle body. I plugged the line from the throttle body and just left the nipple on the EGR open. I get an engine code now telling me my EGR is bad, but all my problems idleing are gone.

 

[GreenChevelleSS]

I was thinking it was the EGR or ISC

 

[GreenChevelleSS]

I checked the codes and came up with code 51
any ideas on what to check

 

[SuprAng]

TPS, theres a procedure in the tsrm website.

had the same prob.

 

[GreenChevelleSS]

is there a connection port on these cars for scanners? Ive got a scanner that I could put on it if it has one?

 

[SuprAng]

nope. Just the diag. block. Goto the tsrm and look up the procedure to adjust tps. All you need is a voltmeter

www.supratsrm.com

 

[GreenChevelleSS]

yea i found it, ive got my own TSRM book i just cant figure out how to use it very well, they need an index.
I think im gonna pull off my throttle body and go through all the procedures on setting everything on it...

 

[cruzinbill]

i had same prob a week ago turned out the potentiometer was shot in mine aswell as the spring it wouldnt spring back on its own

 

[GreenChevelleSS]

the potentiometer is the thing inside the TPS isnt it?
can you just replace it or do you have to replace the whole TPS?
How much do they or the TPS cost?

 

[supraman7mgte]

Have you checked the ISC valve? The TSRM will show you how to check it,I had the same probs but just replaced it with a used one

 

[SuprAng]

the potentiometer is the thing inside the TPS isnt it?
can you just replace it or do you have to replace the whole TPS?
How much do they or the TPS cost?

you can pick up a used tps for like 30-35 bucks. But youll have to adjust it regardless, unless you buy one untouched on a throttle body.

 

[cruzinbill]

^^^ what "He" said