bad idle

02-21-2001, 04:54 PM

I recently installed a 65mm throttle body and egr on my 88 5.0.And now I have a very erratic idle and has what seems to be a bad miss when you go to pull out.I have changed the idle air control and TPS both brand new.What could be the problem? Bad throttle body or what?help...

bigwhitecobra · 02-21-2001, 08:39 PM

sounds like it could be a bad adjustment on the TPS. check it and see. if not, check the failure codes. that should point you in the right direction.

mustang17 · 02-22-2001, 01:07 AM

I have the same problem with my 70mm TB. If you give the car a tiny bit of gas, and I mean tiny, does the idel calm? If yes, you can just drill a small whole in the TB blade. Start with the smallest bit and work your way up. You will have a higher idel, but should level it off. I have not done this to mine because I may be selling it. Maybe someone here has done it....

Good luck, Eric

------------------
1995 GT Black sleeper
Edelbrock 6037 heads,Edelbrock proformer intake,Edelbrock cam, 70mm TB,75mm pro-m mass air,Taylor wires, Underdrive pulleys,Equal length headers,K&N filter
Flowmaster cat-back, Eibach pro rate springs
lower control arms
3.73 gear Centerforce clutch

Capri306 · 02-22-2001, 10:47 AM

Moved to Windsor Power Forum --->

Sounds like a vacuum leak to me, IMHO.

------------------
Capri306, Moderator, The Mustang Works Online
1979 Mercury Capri, 5.0L -- C4 -- 2.73
1987 Mustang LX Notch

02-21-2001, 04:54 PM	#1
Alan Weatherman Guest Posts: n/a	bad idle I recently installed a 65mm throttle body and egr on my 88 5.0.And now I have a very erratic idle and has what seems to be a bad miss when you go to pull out.I have changed the idle air control and TPS both brand new.What could be the problem? Bad throttle body or what?help...

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02-21-2001, 08:39 PM	#2
bigwhitecobra Huh? Whatcha said? Join Date: Oct 2000 Location: Fayetteville, NC Posts: 1,073	sounds like it could be a bad adjustment on the TPS. check it and see. if not, check the failure codes. that should point you in the right direction.

02-22-2001, 01:07 AM	#3
mustang17 Registered Member Join Date: Sep 2000 Location: Concord, MA, USA Posts: 264	I have the same problem with my 70mm TB. If you give the car a tiny bit of gas, and I mean tiny, does the idel calm? If yes, you can just drill a small whole in the TB blade. Start with the smallest bit and work your way up. You will have a higher idel, but should level it off. I have not done this to mine because I may be selling it. Maybe someone here has done it.... Good luck, Eric ------------------ 1995 GT Black sleeper Edelbrock 6037 heads,Edelbrock proformer intake,Edelbrock cam, 70mm TB,75mm pro-m mass air,Taylor wires, Underdrive pulleys,Equal length headers,K&N filter Flowmaster cat-back, Eibach pro rate springs lower control arms 3.73 gear Centerforce clutch

02-22-2001, 10:47 AM	#4
Capri306 Moderator Join Date: Sep 1998 Location: Grand Rapids, Michigan, USA Posts: 1,001	*Moved to Windsor Power Forum --->* Sounds like a vacuum leak to me, IMHO. ------------------ Capri306, Moderator, The Mustang Works Online 1979 Mercury Capri, 5.0L -- C4 -- 2.73 1987 Mustang LX Notch