Hesitation from 1,400 to about 2K

EZRIDN · 04-20-2001, 09:28 AM

Hesitates after warm from those rpms.....i'm thinking TPS. what do u guys think..

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'86 GT.
Gears & Flows

'87 GT.
Stock

LX XLR8R · 04-20-2001, 10:43 AM

at WOT or normal driving..if normal driving id say 2 much spark or 2 much fuel..if at WOT i have no idea if it stops at 2000..what mods to the car

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1987 black notch(ex 4 banger)
DSS 306 w/ main support...Elderbrock 6028 heads..gt-40 intake..24# injectors...70 mm tb..77 pro-m...accel 300+..mac full legnth..tremec w/ pro5oh...full MAC exhaust,off road h-pipe,long tubes, catback...ron davis radiator..subframes, control arms...CFDF II..o yea holley FPR sucks..dont buy one..
AIM=onesillynotch

EZRIDN · 04-20-2001, 11:39 AM

Its happening on the 87 which is bone stock. I have smelled fuel faintly after the car is warmed up when i stop...but that is rare. i just did a tune up and it is still doing the same thing.

Just normal driving. say its ion 5th on the interstate at around 1500 rpms and u give it some gas to pass someone...does it then.

Has a rough idle every now and again too. Not all the time though....

------------------
'86 GT.
Gears & Flows

'87 GT.
Stock

[This message has been edited by EZRIDN (edited 04-20-2001).]

[This message has been edited by EZRIDN (edited 04-20-2001).]

jimberg · 04-20-2001, 06:43 PM

Try cleaning your idle air bypass valve if you haven't already.

EGR sticking open could probably cause those things, too.

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351W 89 Mustang GT Convertible

Unit 5302 · 04-20-2001, 08:40 PM

If it's doing it under WOT acceleration, along with a bucking and surge, there is an excellent chance you're running lean.

Many times that problem is caused by a bad injector. Could be dirty or just shot.

The TPS wouldn't care what rpm you are at, only throttle position.

04-20-2001, 09:28 AM	#1
EZRIDN Registered Member Join Date: Jan 1999 Location: U.S.A. Posts: 504	Hesitation from 1,400 to about 2K Hesitates after warm from those rpms.....i'm thinking TPS. what do u guys think.. ------------------ '86 GT. Gears & Flows '87 GT. Stock

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04-20-2001, 10:43 AM	#2
LX XLR8R Dirk Diggler Join Date: Feb 1999 Location: SLOATSBURG, NY Posts: 1,931	at WOT or normal driving..if normal driving id say 2 much spark or 2 much fuel..if at WOT i have no idea if it stops at 2000..what mods to the car ------------------ 1987 black notch(ex 4 banger) DSS 306 w/ main support...Elderbrock 6028 heads..gt-40 intake..24# injectors...70 mm tb..77 pro-m...accel 300+..mac full legnth..tremec w/ pro5oh...full MAC exhaust,off road h-pipe,long tubes, catback...ron davis radiator..subframes, control arms...CFDF II..o yea holley FPR sucks..dont buy one.. AIM=onesillynotch

04-20-2001, 11:39 AM	#3
EZRIDN Registered Member Join Date: Jan 1999 Location: U.S.A. Posts: 504	Its happening on the 87 which is bone stock. I have smelled fuel faintly after the car is warmed up when i stop...but that is rare. i just did a tune up and it is still doing the same thing. Just normal driving. say its ion 5th on the interstate at around 1500 rpms and u give it some gas to pass someone...does it then. Has a rough idle every now and again too. Not all the time though.... ------------------ '86 GT. Gears & Flows '87 GT. Stock [This message has been edited by EZRIDN (edited 04-20-2001).] [This message has been edited by EZRIDN (edited 04-20-2001).]

04-20-2001, 06:43 PM	#4
jimberg Registered Member Join Date: Oct 1998 Location: Rogers, MN Posts: 2,089	Try cleaning your idle air bypass valve if you haven't already. EGR sticking open could probably cause those things, too. ------------------ 351W 89 Mustang GT Convertible

04-20-2001, 08:40 PM	#5
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	If it's doing it under WOT acceleration, along with a bucking and surge, there is an excellent chance you're running lean. Many times that problem is caused by a bad injector. Could be dirty or just shot. The TPS wouldn't care what rpm you are at, only throttle position.