idle problems

kreil45 · January 1st, 2010, 07:57 AM

i have a 94 gt with bbk cai and throttle body, trick flow street heat upper motor kit, headers, zex nitrous, sct chip (which has been tuned), pulley kit, smog delete, flow master dumps, 255lp fuel pump and 30lb injectors, 90mm maf, msd ignition and a 6al box. all this has been tuned. i can not find a vaccum leak and i have cleaned the throttle boby. what happens is that it stalls in reverse and while i am driving then engage the clutch and let off the gas the rpms stay 2000 until i come to a complete stop (i mean a complete stop) then they go down to 1100. then while it sits and idles it will jump up and down. this has been going on for a while (probable close to a year). i am ready to drive it off a cliff. someone please help me

hotmustang95 · January 1st, 2010, 03:54 PM

Sounds like your TPS is bad or needs adjustment. I just recently learned about this whole deal about how the tps can be adjusted with a volt meter. We worked on a buddy's car and it had the same problem with up/down idle and turning off in reverse and he had a tech adjust it and now runs perfect. We replaced his old one cause it was broken.

Btw's I think your injectors might be too much for your setup but I'm no mechanic so maybe someone who knows for sure can chime in.

kreil45 · January 1st, 2010, 06:51 PM

if i replace the tps what do i set the specs at with all of the stuff that i have?

hotmustang95 · January 1st, 2010, 10:31 PM

I was told for best results, under 1.00. Like .98 is ideal.

kreil45 · January 4th, 2010, 01:02 PM

how do you adjust it with a volt meter?

hotmustang95 · January 5th, 2010, 12:22 AM

I'm not sure. What I do know is you use a voltmeter to messure the current or output or whatever of the wires going into the tps and to adjust it you can actually turn the tps one way or another while messuring the volts and set it to what you want and then screw it down.

mustang fanatic · January 5th, 2010, 10:25 PM

Originally Posted by kreil45

how do you adjust it with a volt meter?

This should help buddy /http://www.muscularmustangs.com/tps.php

mustang fanatic · January 5th, 2010, 10:28 PM

This may help out also.
Detailed information about setting your throttle position sensor voltage - Ford Mustang Forums

spoolin_84svo · January 12th, 2010, 12:24 PM

i think i should show you how. will make a thread cuz i havnt found one on here. yes i did use the search. im no noob to forums.

kreil45 · January 22nd, 2010, 05:20 PM

O.K. i just uplugged the tps while car was idleing and it drop realy quik then went back up. does this mean good or bad?

smott · January 25th, 2010, 08:01 PM

sn95's are notorious for idle surge problems. i think they make some sort of IAC bypass or something that will generally fix this problem. do some research around the internet and you will find the fix, this certainly isnt an odd probblem for us 94 95's

January 1st, 2010, 07:57 AM	#1
kreil45 Regular 94 Mustang GT Join Date: Oct 2006 Location: Tallahassee,FL Posts: 212 iTrader: 0 reviews	idle problems i have a 94 gt with bbk cai and throttle body, trick flow street heat upper motor kit, headers, zex nitrous, sct chip (which has been tuned), pulley kit, smog delete, flow master dumps, 255lp fuel pump and 30lb injectors, 90mm maf, msd ignition and a 6al box. all this has been tuned. i can not find a vaccum leak and i have cleaned the throttle boby. what happens is that it stalls in reverse and while i am driving then engage the clutch and let off the gas the rpms stay 2000 until i come to a complete stop (i mean a complete stop) then they go down to 1100. then while it sits and idles it will jump up and down. this has been going on for a while (probable close to a year). i am ready to drive it off a cliff. someone please help me

January 1st, 2010, 03:54 PM	#2
hotmustang95 Regular Last of the 302's Road Racing Rookie Join Date: Sep 2009 Location: Boynton Beach, FL Posts: 373 iTrader: 0 reviews	Sounds like your TPS is bad or needs adjustment. I just recently learned about this whole deal about how the tps can be adjusted with a volt meter. We worked on a buddy's car and it had the same problem with up/down idle and turning off in reverse and he had a tech adjust it and now runs perfect. We replaced his old one cause it was broken. Btw's I think your injectors might be too much for your setup but I'm no mechanic so maybe someone who knows for sure can chime in. __________________ Victor ( goofyfeet) Oliver P.B.M.C. Member Track Addict Last edited by hotmustang95; January 1st, 2010 at 10:31 PM.

January 1st, 2010, 10:31 PM	#4
hotmustang95 Regular Last of the 302's Road Racing Rookie Join Date: Sep 2009 Location: Boynton Beach, FL Posts: 373 iTrader: 0 reviews	I was told for best results, under 1.00. Like .98 is ideal. __________________ Victor ( goofyfeet) Oliver P.B.M.C. Member Track Addict

January 5th, 2010, 12:22 AM	#6
hotmustang95 Regular Last of the 302's Road Racing Rookie Join Date: Sep 2009 Location: Boynton Beach, FL Posts: 373 iTrader: 0 reviews	I'm not sure. What I do know is you use a voltmeter to messure the current or output or whatever of the wires going into the tps and to adjust it you can actually turn the tps one way or another while messuring the volts and set it to what you want and then screw it down. __________________ Victor ( goofyfeet) Oliver P.B.M.C. Member Track Addict

January 5th, 2010, 10:28 PM	#8
mustang fanatic Hardcore Enthusiast Dont Tread On Me Join Date: Jan 2007 Location: Orange County,CA Posts: 2,142 iTrader: 0 reviews	This may help out also. Detailed information about setting your throttle position sensor voltage - Ford Mustang Forums __________________ 2007 Mustang GT - Pretty much stock. Pypes pypebomb a/b, Tri-ax shifter.

January 1st, 2010, 06:51 PM	#3
kreil45 Regular 94 Mustang GT Join Date: Oct 2006 Location: Tallahassee,FL Posts: 212 iTrader: 0 reviews	if i replace the tps what do i set the specs at with all of the stuff that i have?

January 4th, 2010, 01:02 PM	#5
kreil45 Regular 94 Mustang GT Join Date: Oct 2006 Location: Tallahassee,FL Posts: 212 iTrader: 0 reviews	how do you adjust it with a volt meter?

January 12th, 2010, 12:24 PM	#9
spoolin_84svo Regular 1984 svo Join Date: Jan 2010 Location: 510 East Bay Area Posts: 137 iTrader: 0 reviews	i think i should show you how. will make a thread cuz i havnt found one on here. yes i did use the search. im no noob to forums.

January 22nd, 2010, 05:20 PM	#10
kreil45 Regular 94 Mustang GT Join Date: Oct 2006 Location: Tallahassee,FL Posts: 212 iTrader: 0 reviews	O.K. i just uplugged the tps while car was idleing and it drop realy quik then went back up. does this mean good or bad?

January 25th, 2010, 08:01 PM	#11
smott Regular 1994 GT 11.75@120 Join Date: Mar 2008 Location: Pennsburg Posts: 164 iTrader: 0 reviews	sn95's are notorious for idle surge problems. i think they make some sort of IAC bypass or something that will generally fix this problem. do some research around the internet and you will find the fix, this certainly isnt an odd probblem for us 94 95's __________________ Ford Racing R block stroked 347. Trickflow stage 1 cam, Trickflow street burner upper and lower, gt40P heads, BBk 75mmTB, 03 cobra MAF, Zex dry kit, Tuned by PSI Motorsports, stock valve covers... E/T: 11.75 @ 120mph 2.0 60foot

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