Rev Problem

Stang8Grand · September 21st, 2008, 09:37 PM

K guys i need some help. Ever since i put my trick flow upper plenum and 75 mm TB on when i rev the car up it takes a while for the rpms to come down. If your driving down the road and in lets say 3rd gear and let off the gas the car pulls back like normal but without touching the gas for like 5 seconds itll pull back even more like the rpms trying to finally come down more. Ive replaced the TP sensor, IAC, and also have a SCT tuner and had numorous tunes trying to fix it. Also my TB is closed as much as itll close without binding. Any other ideas on how i can fix this or whats causing the rpms to hang?

JStang14 · September 21st, 2008, 11:32 PM

i had the same problem. my problem was that i forgot to plug the wiring back in to the throttle positioning sensor so i'd check all the plugs around there

Stang8Grand · September 22nd, 2008, 10:39 AM

I triple checked everything is plugged in properly.

mustangracer2g · September 23rd, 2008, 03:10 AM

oh dang, i was lookin to install an aftermarket plenum and tb too, this interesting, i wonder if something like an egr restrictor plate would help?

Stang8Grand · September 23rd, 2008, 07:23 PM

I fixed the problem, i made a IAC Plate and drilled a 17/64" hole for the IAC hole.

97S281 · September 24th, 2008, 05:14 PM

Perfect!!! I was about to recommend it.

steeda98 · October 3rd, 2008, 11:50 AM

i kinda have the same problem..how did u drill that hole on the IAC..on the upper intake plenum correct?

97S281 · October 3rd, 2008, 07:04 PM

you can use gasket material and make your own gasket with a smaller diameter hole than stock to drop you rpm's faster.

Total cost is about $2.00

and you will have plenty of material left over for more.

Stang8Grand · October 3rd, 2008, 11:34 PM

Another method that i used that worked great is to buy a 1/2" copper pipe cap, drill a 17/64" hole in it, and put it in the hose coming outof your iac valve, worked wonders for me and alot easier then making a plate.

97GT4.6 · October 4th, 2008, 12:37 PM

Very nice, i was thinking of getting one of those plates anyways.

kratos2250 · October 18th, 2008, 07:30 PM

What are you guys talking about drilling holes in? Does this mean get rid of you iac, put a plate over the hole and drill a hole in it? I'm kinda confused.

Uncle Humjaba · October 19th, 2008, 01:54 PM

they're talking about making a new gasket to go between the iac valve and the tb with a smaller hole than the stock one.

steeda98 · October 19th, 2008, 09:11 PM

i did that on my car..works pretty good...i used gasket material but it was kinda flimsy..imma re do it and actually use a metal plate and use the gasket to seal it...

September 21st, 2008, 09:37 PM	#1
Stang8Grand Regular 1996 Mustang GT 13.85 on stock garbage tires Join Date: Aug 2007 Location: Pittsburgh PA Posts: 109 iTrader: 0 reviews	Rev Problem K guys i need some help. Ever since i put my trick flow upper plenum and 75 mm TB on when i rev the car up it takes a while for the rpms to come down. If your driving down the road and in lets say 3rd gear and let off the gas the car pulls back like normal but without touching the gas for like 5 seconds itll pull back even more like the rpms trying to finally come down more. Ive replaced the TP sensor, IAC, and also have a SCT tuner and had numorous tunes trying to fix it. Also my TB is closed as much as itll close without binding. Any other ideas on how i can fix this or whats causing the rpms to hang? __________________ Mods in garage. http://www.moddedmustangs.com/forums...-member-11489/

September 22nd, 2008, 10:39 AM	#3
Stang8Grand Regular 1996 Mustang GT 13.85 on stock garbage tires Join Date: Aug 2007 Location: Pittsburgh PA Posts: 109 iTrader: 0 reviews	I triple checked everything is plugged in properly. __________________ Mods in garage. http://www.moddedmustangs.com/forums...-member-11489/

September 23rd, 2008, 03:10 AM	#4
mustangracer2g Regular 1997 Mustang GT not as slow... PI swapped :-) Join Date: May 2008 Location: San Diego, Ca Posts: 275 iTrader: 0 reviews	oh dang, i was lookin to install an aftermarket plenum and tb too, this interesting, i wonder if something like an egr restrictor plate would help? __________________ If there's one thing in life you should never take for granted its the ability to drive fast when given the hp to. (PI engine swapped now, so i can go just a lil bit faster haha) oh yeah, and why the hell do imports always try to race me?! Last edited by mustangracer2g; September 23rd, 2008 at 03:13 AM.

September 23rd, 2008, 07:23 PM	#5
Stang8Grand Regular 1996 Mustang GT 13.85 on stock garbage tires Join Date: Aug 2007 Location: Pittsburgh PA Posts: 109 iTrader: 0 reviews	I fixed the problem, i made a IAC Plate and drilled a 17/64" hole for the IAC hole. __________________ Mods in garage. http://www.moddedmustangs.com/forums...-member-11489/

September 24th, 2008, 05:14 PM	#6
97S281 Rollin' 18/ pushin' 2 1997 Saleen S281 Join Date: Feb 2007 Location: The lost highway Posts: 6,673 iTrader: 13 reviews	Perfect!!! I was about to recommend it. __________________ MODS IN GARAGE NCMM ORIGINAL BLOWN 96-98 CREW MEMBER # 1

September 21st, 2008, 11:32 PM	#2
JStang14 Enthusiast 1996 Mustang GT Join Date: Oct 2007 Location: Greenwood, IN Posts: 589 iTrader: 0 reviews	i had the same problem. my problem was that i forgot to plug the wiring back in to the throttle positioning sensor so i'd check all the plugs around there

October 3rd, 2008, 11:50 AM	#7
steeda98 Regular 1998 Mustang GT Join Date: Feb 2008 Location: Kansas City Posts: 73 iTrader: 0 reviews	i kinda have the same problem..how did u drill that hole on the IAC..on the upper intake plenum correct? __________________ P.I. H/I,TF Stage 1 cams, Comp valve springs and retainers Steeda headers O/R X w/ SLP LM1 JLT CAI w/75mm TB and Plenum, Koni Adj. Steeda plates, lower control arms, rear strut brace,3:73, FRPP driveshaft, SCT tune, TF Underdrive Pulleys

October 3rd, 2008, 07:04 PM	#8
97S281 Rollin' 18/ pushin' 2 1997 Saleen S281 Join Date: Feb 2007 Location: The lost highway Posts: 6,673 iTrader: 13 reviews	you can use gasket material and make your own gasket with a smaller diameter hole than stock to drop you rpm's faster. Total cost is about $2.00 and you will have plenty of material left over for more. __________________ MODS IN GARAGE NCMM ORIGINAL BLOWN 96-98 CREW MEMBER # 1

October 3rd, 2008, 11:34 PM	#9
Stang8Grand Regular 1996 Mustang GT 13.85 on stock garbage tires Join Date: Aug 2007 Location: Pittsburgh PA Posts: 109 iTrader: 0 reviews	Another method that i used that worked great is to buy a 1/2" copper pipe cap, drill a 17/64" hole in it, and put it in the hose coming outof your iac valve, worked wonders for me and alot easier then making a plate. __________________ Mods in garage. http://www.moddedmustangs.com/forums...-member-11489/

October 4th, 2008, 12:37 PM	#10
97GT4.6 Hardcore Enthusiast 97 GT 14.2@99.8 @ 4800 ft Join Date: Oct 2007 Location: Fort Collins and Pueblo, Colorado Posts: 2,347 iTrader: 1 reviews	Very nice, i was thinking of getting one of those plates anyways. __________________ Cammed 2v Built By MustangMatt More mods than times your daughter has slept around

October 18th, 2008, 07:30 PM	#11
kratos2250 Regular Join Date: Feb 2007 Posts: 135 iTrader: 0 reviews	What are you guys talking about drilling holes in? Does this mean get rid of you iac, put a plate over the hole and drill a hole in it? I'm kinda confused. __________________ 2003 Black Cobra. 2.3 whipple JLT RAI Dragon t/b 60s BAP Mafia Xcal3 MAC LTs w/ORX-pipe Borla stingers Billetflow IRS brace Eibach springs 1989 GT AFM b-31 cam crane springs 6.3 pushrods elec. W/P/fan 3:73s Manual steering tri-ax Shorties-orh-flows

October 19th, 2008, 01:54 PM	#12
Uncle Humjaba Enthusiast 1996 Mustang GT Premium 15.2@91 Join Date: Aug 2007 Location: Tracy, CA and Clemson, SC Posts: 590 iTrader: 0 reviews	they're talking about making a new gasket to go between the iac valve and the tb with a smaller hole than the stock one. __________________ "He is no fool who gives up what he cannot keep to gain what he cannot lose."

October 19th, 2008, 09:11 PM	#13
steeda98 Regular 1998 Mustang GT Join Date: Feb 2008 Location: Kansas City Posts: 73 iTrader: 0 reviews	i did that on my car..works pretty good...i used gasket material but it was kinda flimsy..imma re do it and actually use a metal plate and use the gasket to seal it... __________________ P.I. H/I,TF Stage 1 cams, Comp valve springs and retainers Steeda headers O/R X w/ SLP LM1 JLT CAI w/75mm TB and Plenum, Koni Adj. Steeda plates, lower control arms, rear strut brace,3:73, FRPP driveshaft, SCT tune, TF Underdrive Pulleys

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