New Engine and It won't idle.
Thread Starter
Junior Member
Joined: Apr 2000
Posts: 25
Likes: 0
From: Waco, Texas
New Engine and It won't idle.
I rebuilt 5.7 in my 91 Z28. I put on L98 Corvette heads and the LT4 Hot Cam. The car will not idle in the mornings. When I make a turn after decelerating it tries to stall. Also, when coming to a stop it freaks. I have put 121 miles on the motor already. I have not messed with the IAC or TPS yet. Any suggestions? Thanks, Brandon
Supreme Member
Joined: Oct 2000
Posts: 1,052
Likes: 0
From: Lima, Ohio
Beings that its a 91Z i'm going to assume that it is speed density?
Since you have done some radical changes as far as the computer is concerned i can understand why it is doing that. You will need a custom prom. It would help if you adjusted the timing(if needed) then iac then tps.
Brendan
------------------
1987 IROC-Z L98,SuperRam,EB 6085's,LPE 219/219 Roller, Crane 1.6RR, EB TPI Base, 58mm TB, ADS 24#, AFPR, K&N, EB TES, Catco Cat, 3" Borla Cat-Back, Accel cap,rotor,distro/other crap, MSD 6AL, MSD Blaster 3, Aluminum DS, 94 Disk Rear, Adjustable Valve, Precision 3.73 Gears, Sub-Frame Connectors, Hotchkis Lower Control Arms, KYB Shocks/Struts, Suspension Techniques Lowering Springs, Polyurethan Bushings all over the place, Moog Upper/Lower Ball joints and Tie Rods ends/Idler Arm,
To see the ROC, Check out the webpage Here
Since you have done some radical changes as far as the computer is concerned i can understand why it is doing that. You will need a custom prom. It would help if you adjusted the timing(if needed) then iac then tps.
Brendan
------------------
1987 IROC-Z L98,SuperRam,EB 6085's,LPE 219/219 Roller, Crane 1.6RR, EB TPI Base, 58mm TB, ADS 24#, AFPR, K&N, EB TES, Catco Cat, 3" Borla Cat-Back, Accel cap,rotor,distro/other crap, MSD 6AL, MSD Blaster 3, Aluminum DS, 94 Disk Rear, Adjustable Valve, Precision 3.73 Gears, Sub-Frame Connectors, Hotchkis Lower Control Arms, KYB Shocks/Struts, Suspension Techniques Lowering Springs, Polyurethan Bushings all over the place, Moog Upper/Lower Ball joints and Tie Rods ends/Idler Arm,
To see the ROC, Check out the webpage Here
Senior Member
Joined: Mar 2001
Posts: 547
Likes: 1
From: Pueblo Co usa
Yea i agree with leirch, you probably need an upgrades prom. Call "Jet Performance" and tell them what you have done to you car and they can get you the correct prom for about 180$ 714-848-5515.
or sales@jetchip.com. just write or talk to them. Ive had good experiance with them.
or sales@jetchip.com. just write or talk to them. Ive had good experiance with them.
Joined: Jul 1999
Posts: 10,950
Likes: 27
From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
You have the same cam and heads as me. Do the IAC and TPS reset procedure as described in the tech article. After I did that, I went from 11" of vacuum to 17"! The car idled much better. A custom chip helps, but do this first. Your next mod should be a higher stall converter, in the 2600-2800 range.
------------------
West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-
------------------
West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-
Thread
Thread Starter
Forum
Replies
Last Post
