Car RPM's Hanging between shifts

95blackbeauty · January 31st, 2009, 07:47 PM

I thought my IAC was bad so i replaced it and it still has the problem. It jacks the RPM's up when I push in the clutch between shifts and i cant figure it out. Maybe my TPS? can anyone point me in the right direction? I thought Autozone could pull egine codes on our computers cuz the check engine comes on but they said they couldnt. I think the light is on because of whatever it is making my throttle hang up. Thanks for looking.

Racinjason81 · January 31st, 2009, 10:47 PM

a bad tps can cause that

95blackbeauty · January 31st, 2009, 11:45 PM

changed tps...still happenin

Nitrous Injected · January 31st, 2009, 11:53 PM

you may have a slight vacum leak, or you can adjust the throttle blade with th adjusting screw on the side of your TB..i had the same problem and i just cleaned the the throtlle out with TB cleaner and set the TB blade to idle the car around 700-800 RPM. Now the throttle dont semm to stick and the rpms drop normal. also change out all the upper plenum caskets.IAC,EGR,TBS,TB to PLENUM,and PLENUM to intake manifold also check for dead spots in you TBS sensor to make sure that it is difenatly not the problem( you can do this useing an OHM meter...i hope this helps

usmc95gt · February 4th, 2009, 03:06 PM

i know it sounds kinda dumb but have you checked the throttle return spring? my car was doing the same thing and it was just my fault when i changed the throttle body i forgot to hook the spring back up.

Ryno8705 · February 4th, 2009, 11:46 PM

Do a search over on Corral.net, I did a write up on a few threads about how I fixed the problem you are having... In short, you need an idle air restrictor plate ($15) or listen to all the people who think getting a tune will fix life's problems. If you don't have an account on corral I'll find it and post it here.

Edit, I just found it and here's the link: hanging rpms between shifts - Corral Forums
I did end up buying one on eBay which was stainless steel, but I also made one out of metal duct work.

I posted in other threads on Corral which have further info, just do a search.

WildWill · February 5th, 2009, 09:50 PM

^^^ and that guy knows his sh*t, so listen to him! trust me...

January 31st, 2009, 07:47 PM	#1
95blackbeauty Enthusiast 95 5.0 too slow Join Date: Mar 2007 Location: Athens, TX Posts: 910 iTrader: 0 reviews	Car RPM's Hanging between shifts I thought my IAC was bad so i replaced it and it still has the problem. It jacks the RPM's up when I push in the clutch between shifts and i cant figure it out. Maybe my TPS? can anyone point me in the right direction? I thought Autozone could pull egine codes on our computers cuz the check engine comes on but they said they couldnt. I think the light is on because of whatever it is making my throttle hang up. Thanks for looking. __________________ 95 gt H.O. Udp's, Pypes O/r X, flowmaster 40's,CAI, 3.73 gears, C&L 76mm MAF,GT40p's, Shorties, 1.6 rr's,Gt40 manifold, short throw, Back Seat Delete BOOSTED

January 31st, 2009, 10:47 PM	#2
Racinjason81 Hardcore Enthusiast Join Date: Feb 2007 Location: New jersey Posts: 1,559 iTrader: 0 reviews	a bad tps can cause that __________________ Heres a real funny video youtube.com/watch?v=ojB7KkaR03I VTEC stands for Very Torqueless Economy Car Honda stands for Hold On Not Done Accelerating 1991 LX 5.0 H/B(T-70 turbo coming soon)

January 31st, 2009, 11:45 PM	#3
95blackbeauty Enthusiast 95 5.0 too slow Join Date: Mar 2007 Location: Athens, TX Posts: 910 iTrader: 0 reviews	changed tps...still happenin __________________ 95 gt H.O. Udp's, Pypes O/r X, flowmaster 40's,CAI, 3.73 gears, C&L 76mm MAF,GT40p's, Shorties, 1.6 rr's,Gt40 manifold, short throw, Back Seat Delete BOOSTED

January 31st, 2009, 11:53 PM	#4
Nitrous Injected Regular 2003 Mustang GT 13.987@100.98 MPH Join Date: Oct 2008 Location: Mt. pleasant Posts: 107 iTrader: 0 reviews	you may have a slight vacum leak, or you can adjust the throttle blade with th adjusting screw on the side of your TB..i had the same problem and i just cleaned the the throtlle out with TB cleaner and set the TB blade to idle the car around 700-800 RPM. Now the throttle dont semm to stick and the rpms drop normal. also change out all the upper plenum caskets.IAC,EGR,TBS,TB to PLENUM,and PLENUM to intake manifold also check for dead spots in you TBS sensor to make sure that it is difenatly not the problem( you can do this useing an OHM meter...i hope this helps __________________ 88 NOTCH,351 WINDSER,BUILT C6 TRANY,750 CFM CARB,4:30 GEAR=??? WWIII 2003 MUSTANG GT SOLD with 488 RWHP and 520 FT-LB on 150 shot and bolt ons R.I.P.

February 4th, 2009, 11:46 PM	#6
Ryno8705 Newbie Join Date: Aug 2008 Posts: 45 iTrader: 0 reviews	Do a search over on Corral.net, I did a write up on a few threads about how I fixed the problem you are having... In short, you need an idle air restrictor plate ($15) or listen to all the people who think getting a tune will fix life's problems. If you don't have an account on corral I'll find it and post it here. Edit, I just found it and here's the link: hanging rpms between shifts - Corral Forums I did end up buying one on eBay which was stainless steel, but I also made one out of metal duct work. I posted in other threads on Corral which have further info, just do a search. Last edited by Ryno8705; February 5th, 2009 at 12:02 AM.

February 4th, 2009, 03:06 PM	#5
usmc95gt Newbie 1995 mustang gt Join Date: Oct 2008 Location: utah Posts: 21 iTrader: 0 reviews	i know it sounds kinda dumb but have you checked the throttle return spring? my car was doing the same thing and it was just my fault when i changed the throttle body i forgot to hook the spring back up.

February 5th, 2009, 09:50 PM	#7
WildWill Hardcore Enthusiast 1995 Mustang GT Join Date: Oct 2007 Location: Solomons, MD Posts: 1,112 iTrader: 0 reviews	^^^ and that guy knows his sh*t, so listen to him! trust me... __________________ GT40p heads, 1.7 crane RR's, GT40 u/l, MAC LTs, MAC o/r h-pipe, Flowmaster 40s, 65mm t/b, '03 Cobra Bilstein Struts, Tokico Bullitt Shocks, MM c/c plates, Eibach Sportlines, B&M shifter, 255lph f/p, RAM p/g clutch, Fidanza alum fly, rebuilt t-5

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