Stalling headache!!
Thread Starter
Junior Member
Joined: Sep 2003
Posts: 16
Likes: 0
From: South Brunswick, NJ
Car: 88 GTA, 92 Formula
Engine: 355, LB9
Transmission: WC T-5, WC T-5
Axle/Gears: 3.27 LT1 Rear
Stalling headache!!
Hey guys. Ive been battling with my 92 Formula for a while now with this stalling problem.
It's a bone stock lb9 with the 7730 ecm.
My issue is cold start. It will not stay running when cold unless you tip in the throttle and keep the rpms at 2k. After about 3 minutes you feel the car smooth out and it will maintain idle but surge a bit.
I've already chased injectors, iac, map, tps, mat, and fuel pressure reg. All the sensors are within range. And fuel pressure is around 45-48 psi. Anyone have any other ideas what could cause this?
It's a bone stock lb9 with the 7730 ecm.
My issue is cold start. It will not stay running when cold unless you tip in the throttle and keep the rpms at 2k. After about 3 minutes you feel the car smooth out and it will maintain idle but surge a bit.
I've already chased injectors, iac, map, tps, mat, and fuel pressure reg. All the sensors are within range. And fuel pressure is around 45-48 psi. Anyone have any other ideas what could cause this?
Thread Starter
Junior Member
Joined: Sep 2003
Posts: 16
Likes: 0
From: South Brunswick, NJ
Car: 88 GTA, 92 Formula
Engine: 355, LB9
Transmission: WC T-5, WC T-5
Axle/Gears: 3.27 LT1 Rear
Senior Member
iTrader: (6)
Joined: May 2005
Posts: 751
Likes: 0
From: Beech Bluff,TN
Car: 1991 Trans Am Convertible
Engine: 305 TPI
Transmission: T5
Axle/Gears: 3:08
Re: Stalling headache!!
I had a similar issue and it was my EGR valve had gotten all crusty with carbon buildup...check that out and see if its functioning properly
Senior Member
Joined: Aug 2008
Posts: 710
Likes: 32
From: pensacola florida
Car: 1989 Firebird Formula
Engine: 5.7 LS1
Transmission: 4L60E
Axle/Gears: 3.27
Re: Stalling headache!!
Get the ecm tested. It will eliminate the obvious at least. Oil pressure sensor could have an effect on this.
Supreme Member
Joined: Feb 2008
Posts: 1,004
Likes: 1
Car: 90 IROC
Engine: 5.7 TPI
Transmission: 4L60
Axle/Gears: 3.23
Re: Stalling headache!!
Ok, sorry I missed that. When you say the sensors are within range do you mean you checked them with a meter out of the engine, or you are using an OBD monitoring tool to see what the ECM is reading them as? I have a coolant sensor in the garage that seems to check out until you put it in the engine; then it's suddenly -40F.
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