Revs When Shifting Gears...Help

StreetRacin89Stang · 07-01-2001, 06:26 PM

Last night (and lately) the car has been revving when i push in the clutch to shift. This happen usally after i have gotten on the car for a lil bit. I will be shifting at say 2500 and the revs will shoot up to 3000 and come down slowly while the clutch is in. The car also holds a high idle speed in conjunction with the other problem. It might idle at 2000 and not come down. I shut the car off and it will be fine until i get on it again.
Is this a TPS problem? Do i need to reset it or bore out the mounting holes?? Any other ideas would be greatly appreciated.

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89 5.0 GT White w/Blue Racing Stripes
K&N, 73mm Mass Air, Ported and Polished Stock Heads, E303 Cam, MAC equal Length Headers, Off Road H-Pipe, Borla Mufflers, 3.73's Sway Bars, Strut Tower Brace, Subframe Connectors, Eibach Springs, Koni Adjustables/Reds, Pony 5 Stars, 1000 Watt JL Audio System, No P/S , No Smog Pump

jimberg · 07-01-2001, 06:34 PM

Before you start twiddling with stuff, check for codes from your computer. If no codes, then look for a vacuum leak. Possibly the PCV valve popped out or something.

If that's not the problem, try unhooking the neg battery terminal for 15 minutes and then rehook it back up. Start car and let it idle for 10 minutes, all accessories off. Then shut it down and restart and let idle for another 10 minutes. All accessories on.

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351W 89 Mustang GT Convertible

SlowStang2 · 07-01-2001, 07:42 PM

My car does exactly that too. Same RPM and everything. Mine does it only when I shift from 3rd to fourth and 4th to 5th. Very annoying, I agree. I, for one, has had this happen to me since purchase of car. (Last May) I too will try disconnecting battery for a while, but any other suggestions?

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94' Stang GT Convertible Cobra upper&lower, Mac cold air w/K&N, BBK equal length shorties, BBK offroad H-pipe, American Thunder cat-back, BBK T/B 65mm, 24lb injectors, Pro-77mm MAM, pulleys, aluminum driveshaft, 3.55s 14.4@100. (Sad, i know. i have stock heads)

stanger8172 · 07-01-2001, 09:24 PM

Same thing happened to my car too. I just unplugged the AIB(air idle bypass) valve from the throttle body. The car doesn't like cold starts but I just keep my lead foot on the pedal for a min. Soon I am going to clean the throttle pos. sensor and then plug the AIB back in. good luck

93CobraR · 07-01-2001, 10:05 PM

Yeah, try either replacing/cleaning or unpluging the AIB valve thats on the side of the throttle body. Its in the front and cylinder shaped. It works like a choke, and it mess's with your idle pretty much.

------------------
87 GT, 4 inch cowl hood,17x9 Cobra R's/255/45's,GT-40 heads,Crane 2031, Edelbrock intake, long tubes headers,h-pipe,Flows,BBK cold air, Mass air,70mm MAF, 1.7's, 1" spacer,underdrive pulleys,Pro 5.0, King Cobra, Adj. fuel Reg., Lakewood Lift Bars,50/50's,subframes, 4.10's.
Best time 12.759
Best MPH 106.79
Best 60' 1.695

Visit my site at:
http://www.geocities.com/cobrar93_2000/MyPage.html

07-01-2001, 06:26 PM	#1
StreetRacin89Stang Registered Member Join Date: Dec 2000 Location: Bay Area, California Posts: 63	Revs When Shifting Gears...Help Last night (and lately) the car has been revving when i push in the clutch to shift. This happen usally after i have gotten on the car for a lil bit. I will be shifting at say 2500 and the revs will shoot up to 3000 and come down slowly while the clutch is in. The car also holds a high idle speed in conjunction with the other problem. It might idle at 2000 and not come down. I shut the car off and it will be fine until i get on it again. Is this a TPS problem? Do i need to reset it or bore out the mounting holes?? Any other ideas would be greatly appreciated. ------------------ 89 5.0 GT White w/Blue Racing Stripes K&N, 73mm Mass Air, Ported and Polished Stock Heads, E303 Cam, MAC equal Length Headers, Off Road H-Pipe, Borla Mufflers, 3.73's Sway Bars, Strut Tower Brace, Subframe Connectors, Eibach Springs, Koni Adjustables/Reds, Pony 5 Stars, 1000 Watt JL Audio System, No P/S , No Smog Pump

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07-01-2001, 06:34 PM	#2
jimberg Registered Member Join Date: Oct 1998 Location: Rogers, MN Posts: 2,089	Before you start twiddling with stuff, check for codes from your computer. If no codes, then look for a vacuum leak. Possibly the PCV valve popped out or something. If that's not the problem, try unhooking the neg battery terminal for 15 minutes and then rehook it back up. Start car and let it idle for 10 minutes, all accessories off. Then shut it down and restart and let idle for another 10 minutes. All accessories on. ------------------ 351W 89 Mustang GT Convertible

07-01-2001, 07:42 PM	#3
SlowStang2 Registered Member Join Date: May 2001 Location: Stuart, FL, US Posts: 147	My car does exactly that too. Same RPM and everything. Mine does it only when I shift from 3rd to fourth and 4th to 5th. Very annoying, I agree. I, for one, has had this happen to me since purchase of car. (Last May) I too will try disconnecting battery for a while, but any other suggestions? ------------------ 94' Stang GT Convertible Cobra upper&lower, Mac cold air w/K&N, BBK equal length shorties, BBK offroad H-pipe, American Thunder cat-back, BBK T/B 65mm, 24lb injectors, Pro-77mm MAM, pulleys, aluminum driveshaft, 3.55s 14.4@100. (Sad, i know. i have stock heads)

07-01-2001, 09:24 PM	#4
stanger8172 Registered Member Join Date: Nov 2000 Location: Milwaukee,Wisconsin Posts: 380	Same thing happened to my car too. I just unplugged the AIB(air idle bypass) valve from the throttle body. The car doesn't like cold starts but I just keep my lead foot on the pedal for a min. Soon I am going to clean the throttle pos. sensor and then plug the AIB back in. good luck

07-01-2001, 10:05 PM	#5
93CobraR Registered Member Join Date: Oct 1999 Location: Cincinnati, Ohio Posts: 1,575	Yeah, try either replacing/cleaning or unpluging the AIB valve thats on the side of the throttle body. Its in the front and cylinder shaped. It works like a choke, and it mess's with your idle pretty much. ------------------ 87 GT, 4 inch cowl hood,17x9 Cobra R's/255/45's,GT-40 heads,Crane 2031, Edelbrock intake, long tubes headers,h-pipe,Flows,BBK cold air, Mass air,70mm MAF, 1.7's, 1" spacer,underdrive pulleys,Pro 5.0, King Cobra, Adj. fuel Reg., Lakewood Lift Bars,50/50's,subframes, 4.10's. Best time 12.759 Best MPH 106.79 Best 60' 1.695 Visit my site at: http://www.geocities.com/cobrar93_2000/MyPage.html