why does my tpi engine rev up when I push the clutch in
06-02-2008 | 12:30 AM
#1
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From: Beech Bluff,TN
Car: 1991 Trans Am Convertible
Engine: 305 TPI
Transmission: T5
Axle/Gears: 3:08
why does my tpi engine rev up when I push the clutch in
I have a 91 trans am with a 305 tpi T-5,and when I stop at a stoplight or whatever and I press the clutch in the engine revs up a little and slowly,I mean SLOWLY goes back down to idle..I'm not getting any codes but this drives me crazy...Thanks,Dave
06-02-2008 | 07:20 AM
#2
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Joined: Mar 2004
Posts: 923
Likes: 2
From: Bakersfield, CA
Car: 91 Z28
Engine: 383 SuperRam
Transmission: ProBuilt 700r4
Axle/Gears: G92 3.23
Re: why does my tpi engine rev up when I push the clutch in
its normal, its part of the iac throttle follower function.
06-02-2008 | 07:33 PM
#3
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iTrader: (6)
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From: Beech Bluff,TN
Car: 1991 Trans Am Convertible
Engine: 305 TPI
Transmission: T5
Axle/Gears: 3:08
Re: why does my tpi engine rev up when I push the clutch in
can i get a second on that?thanks man..
06-02-2008 | 08:12 PM
#4
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Joined: Dec 2007
Posts: 197
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From: ny
Car: 89 Formula
Engine: LB9 TPI
Transmission: 700R4
Axle/Gears: 3.73(coming soon)
Re: why does my tpi engine rev up when I push the clutch in
ill be second!!!
yes its normal...the 86 mustang gt at the shop does the same thing you explain
yes its normal...the 86 mustang gt at the shop does the same thing you explain
funny
06-04-2008 | 12:36 PM
#7
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Joined: Nov 2003
Posts: 388
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From: Victoria, British Columbia
Car: 1989 GTA
Engine: 5.0 TPI
Transmission: T-5 WC
Axle/Gears: Yukon 3.73
Re: why does my tpi engine rev up when I push the clutch in
Check to ensure your throttle is returning to rest on the idle screw. I had the same problem which was caused by the butterfly valves sticking on the throttle body bores holding the throttle open which cause the throttle position sensor to be open a bit telling the engine to rev up. You may need a stronger throttle return spring. Your throttle position sensor could be slightly out or worn, likewise with the idle air control valve, you could have a vacuum leak you could possibly even need a new ECM but that is unlikely. This was referred to idling up by mechanic and is documented in my recent post.
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06-04-2008 | 05:08 PM
#8
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From: Minneapolis, MN
Car: currently a 91 G92.
Engine: 305TPI
Transmission: Borg Warner WC 5 speed
Axle/Gears: 3.42
Re: why does my tpi engine rev up when I push the clutch in
How high does it rev up?
Does it do it when you are stopped and just press on the clutch, or does it do it only when you are moving?
I have a 91 formula TPI 5 speed, very similar to your car, except for a recent engine rebuild and a cam upgrade, and I have not noticed anything abnormal with my engine when I press on the clutch. The car tends to idle a little higher, about 1000 - 1200 rpm when moving and I press the clutch, but not while stopped.
Does it do it when you are stopped and just press on the clutch, or does it do it only when you are moving?
I have a 91 formula TPI 5 speed, very similar to your car, except for a recent engine rebuild and a cam upgrade, and I have not noticed anything abnormal with my engine when I press on the clutch. The car tends to idle a little higher, about 1000 - 1200 rpm when moving and I press the clutch, but not while stopped.
06-07-2008 | 05:55 AM
#10
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Joined: Feb 2000
Posts: 7,964
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From: Norfolk, VA. USA
Car: 86 Trans Am, 88 Formula
Engine: 95LT4, 305TPI
Transmission: T56, T5
Re: why does my tpi engine rev up when I push the clutch in
Are you saying that when you are already stopped sitting at the light and you have the car in neutral, you press in the clutch and the rpms go up?
Mine will rev up a bit when I push in the clutch while I am still rolling and am about to stop, then it slowly drops down.
Mine will rev up a bit when I push in the clutch while I am still rolling and am about to stop, then it slowly drops down.
really original
06-08-2008 | 07:53 PM
#12
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From: Beech Bluff,TN
Car: 1991 Trans Am Convertible
Engine: 305 TPI
Transmission: T5
Axle/Gears: 3:08
Re: why does my tpi engine rev up when I push the clutch in
Nah,Its doing what you described yours does....I've been outta town for work and havent had a chance to look at the thing...Thanks for all the help guys...Dave
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