Car Idle at 2000rpm Help Hurry

manycars23 · 09-29-2002, 01:01 AM

I bought a 70mm throttle body for my 94 GT I took the old one off and installed the new one put everything back together but when I started the car it idled at 2000rpm I tried adjusting the idle screw on the TB but nothing worked. So i was pretty p.o.'ed
so i put the old Tb back on and the car did the same thing. Also there is a little more play in the throttle cable than there was when I started. I checked it at the pedal and the pedal doesn't jump back up like it used to however you can wrap the cable around a piece of the Tb and the pedal is in normal position and it revs fine but still only comes down to 2000rpm. Does anyone have any advice for me or help they can give I am in dire need because if i drive the car like this it will peel out of 2nd gear and just generally not drive right obviously!

HotRoddin · 09-29-2002, 01:42 AM

Vacuum leak ... either that or the throttle is not closing all the way down ... look at the butterfly in the TB and see if it looks closed all the way when its idling ?

88workcar · 09-29-2002, 08:13 AM

I want to say vacume leak. What about the TPS? New/old, how is it set?

88workcar · 09-29-2002, 08:16 AM

Also try cleaning the Idle air bypass valve

LX XLR8R · 09-29-2002, 12:43 PM

you would have to reset the ECM and reset the TPS..to do that there is a 5 minute prsess that i dont recall exaclty so i will not post how to do it..i do rember it consists of disconnecdting the neg term and leaving the lights on for 1/2 hour then starting turing the car to KOEoff and setting the TPS to .95-.98..after this turn on the car and let it run for 2 minutes with no accesories on..shut off then start again with all accesories on..turn off after 2 mintes..then it should be good..the process is soemthing amounst those lines but dont quote me!

manycars23 · 10-01-2002, 02:46 AM

i have a new TPS on order there doesn't seem to be any leaks in what i installed. All the bolt are tight and everything is secure i know that isn't the best way to check but...!! The check engine light wasn't on when I first installed the TB but after disconnecting it and re-installing everything the idle is down to 1400 at idle and the engine light is on so it is kinda puzzling. Should the TPS itself in side where it attaches to the TB should you be able to move it completely in a circle pretty easy or should it be stationary?!

88workcar · 10-01-2002, 04:49 AM

Check the tps voltage. You will need a digital volt meter set on DC. Ground the black and use the point on the red to peirce the orange wire on the tps. with the key on, set it, by loosening the two little screws the hold it down.Move it till the meter shows .95 - .99 volts.

drtbiker · 10-01-2002, 10:07 AM

ok thats it now it makes the two of us anyone know how to reset the tps, mine did the same i took off the throtle body put it on had a 2thousand rpm idle, took it off again thinking it had a leak so i replaced the gaskets tightend down to spec and still the same thing except now it is about 1600rpms i am so confused i dont even know what to do. does anyone reset the ecm and the tps. i tried how i thought to do it and it didnt work could someone try to explain the properway
thanks alot it seams were both having the same problem

drtbiker · 10-01-2002, 10:55 PM

come on guys help us out

manycars23 · 10-04-2002, 12:30 PM

Ok I figured out my problem I had bought this throttle body of of ebay which it was new in the box. I put a new TPS on and the engie light went off but it still wouldn;t idle down so i decided to call the company that makes the TB and it seems that they had recalled all of the ones they made and the guy told me it would be about 3 weeks before they were done making new ones and that he would switch it out even though i didn't get it from him. Also i reinstalled everything that was on there before w' the exception of the old TPS and my car is running fine now!!! thanks for your help

09-29-2002, 01:01 AM	#1
manycars23 Registered Member Join Date: Jul 2002 Location: indiana Posts: 11	Car Idle at 2000rpm Help Hurry I bought a 70mm throttle body for my 94 GT I took the old one off and installed the new one put everything back together but when I started the car it idled at 2000rpm I tried adjusting the idle screw on the TB but nothing worked. So i was pretty p.o.'ed so i put the old Tb back on and the car did the same thing. Also there is a little more play in the throttle cable than there was when I started. I checked it at the pedal and the pedal doesn't jump back up like it used to however you can wrap the cable around a piece of the Tb and the pedal is in normal position and it revs fine but still only comes down to 2000rpm. Does anyone have any advice for me or help they can give I am in dire need because if i drive the car like this it will peel out of 2nd gear and just generally not drive right obviously!

09-29-2002, 08:13 AM	#3
88workcar Registered Member Join Date: Oct 1999 Location: Pierre Part, La. U.S.A. Posts: 1,850	I want to say vacume leak. What about the TPS? New/old, how is it set? __________________ 88workcar 1988 Mustang LX 342. 417rwhp @ 6800. 28 X 10 ET Drag, 4.30s, 10.69 @ 126.43 1.42 60ft. 11.13 @ 127.7 on BFGs 1.72 60ft Rice Hater # 42 To be old and wise, You must first be young and stupid I'm somewhere in tthe middle.

09-29-2002, 08:16 AM	#4
88workcar Registered Member Join Date: Oct 1999 Location: Pierre Part, La. U.S.A. Posts: 1,850	Also try cleaning the Idle air bypass valve __________________ 88workcar 1988 Mustang LX 342. 417rwhp @ 6800. 28 X 10 ET Drag, 4.30s, 10.69 @ 126.43 1.42 60ft. 11.13 @ 127.7 on BFGs 1.72 60ft Rice Hater # 42 To be old and wise, You must first be young and stupid I'm somewhere in tthe middle.

09-29-2002, 12:43 PM	#5
LX XLR8R Dirk Diggler Join Date: Feb 1999 Location: SLOATSBURG, NY Posts: 1,931	you would have to reset the ECM and reset the TPS..to do that there is a 5 minute prsess that i dont recall exaclty so i will not post how to do it..i do rember it consists of disconnecdting the neg term and leaving the lights on for 1/2 hour then starting turing the car to KOEoff and setting the TPS to .95-.98..after this turn on the car and let it run for 2 minutes with no accesories on..shut off then start again with all accesories on..turn off after 2 mintes..then it should be good..the process is soemthing amounst those lines but dont quote me! __________________ 95 undecided cubes, AFR 185s,undecided cam, undecided intake, and a 150 hit 89 "turbonotch" 2.3T You might want to hold on..i saw this on a cartoon once

10-01-2002, 04:49 AM	#7
88workcar Registered Member Join Date: Oct 1999 Location: Pierre Part, La. U.S.A. Posts: 1,850	Check the tps voltage. You will need a digital volt meter set on DC. Ground the black and use the point on the red to peirce the orange wire on the tps. with the key on, set it, by loosening the two little screws the hold it down.Move it till the meter shows .95 - .99 volts. __________________ 88workcar 1988 Mustang LX 342. 417rwhp @ 6800. 28 X 10 ET Drag, 4.30s, 10.69 @ 126.43 1.42 60ft. 11.13 @ 127.7 on BFGs 1.72 60ft Rice Hater # 42 To be old and wise, You must first be young and stupid I'm somewhere in tthe middle.

09-29-2002, 01:42 AM	#2
HotRoddin cranky old man Join Date: Sep 2001 Location: Longview Texas Posts: 683	Vacuum leak ... either that or the throttle is not closing all the way down ... look at the butterfly in the TB and see if it looks closed all the way when its idling ?

10-01-2002, 02:46 AM	#6
manycars23 Registered Member Join Date: Jul 2002 Location: indiana Posts: 11	i have a new TPS on order there doesn't seem to be any leaks in what i installed. All the bolt are tight and everything is secure i know that isn't the best way to check but...!! The check engine light wasn't on when I first installed the TB but after disconnecting it and re-installing everything the idle is down to 1400 at idle and the engine light is on so it is kinda puzzling. Should the TPS itself in side where it attaches to the TB should you be able to move it completely in a circle pretty easy or should it be stationary?!

10-01-2002, 10:07 AM	#8
drtbiker Registered Member Join Date: Jan 2002 Location: Mt. Prospect,IL Posts: 474	ok thats it now it makes the two of us anyone know how to reset the tps, mine did the same i took off the throtle body put it on had a 2thousand rpm idle, took it off again thinking it had a leak so i replaced the gaskets tightend down to spec and still the same thing except now it is about 1600rpms i am so confused i dont even know what to do. does anyone reset the ecm and the tps. i tried how i thought to do it and it didnt work could someone try to explain the properway thanks alot it seams were both having the same problem __________________ 87-ford-mustang-SOLD! mods: 3:73's, off road h-pipe, b303 cam in gt- 40 motor w/ Power Plus intake, edelbrock 70mm tb & egr spacer, 72mm C&L, bbk long tubes, tremec tranny, centerforce dual friction clutch, upr and lwr CA's 255lph FP and soon more to come.... when i have money again SOME ADVICE Don't do burn outs in reverse it is very expensive New times with dead hook on dr's 13.27@103 with 2.0 60 foots w/100lb system Fastest time to date: 12.8@113

10-01-2002, 10:55 PM	#9
drtbiker Registered Member Join Date: Jan 2002 Location: Mt. Prospect,IL Posts: 474	come on guys help us out __________________ 87-ford-mustang-SOLD! mods: 3:73's, off road h-pipe, b303 cam in gt- 40 motor w/ Power Plus intake, edelbrock 70mm tb & egr spacer, 72mm C&L, bbk long tubes, tremec tranny, centerforce dual friction clutch, upr and lwr CA's 255lph FP and soon more to come.... when i have money again SOME ADVICE Don't do burn outs in reverse it is very expensive New times with dead hook on dr's 13.27@103 with 2.0 60 foots w/100lb system Fastest time to date: 12.8@113

10-04-2002, 12:30 PM	#10
manycars23 Registered Member Join Date: Jul 2002 Location: indiana Posts: 11	Ok I figured out my problem I had bought this throttle body of of ebay which it was new in the box. I put a new TPS on and the engie light went off but it still wouldn;t idle down so i decided to call the company that makes the TB and it seems that they had recalled all of the ones they made and the guy told me it would be about 3 weeks before they were done making new ones and that he would switch it out even though i didn't get it from him. Also i reinstalled everything that was on there before w' the exception of the old TPS and my car is running fine now!!! thanks for your help

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