Car hunts for idle?
Thread Starter
Joined: Dec 2007
Posts: 1,924
Likes: 12
From: Minnesota
Car: 84 camaro, 88 trans am, 98 camaro
Engine: Modded , stock, LSX modded
Transmission: 700r4, 700r4, t-56
Axle/Gears: 327, 308, 373
Car hunts for idle?
1988 trans am, stock 305/auto... new fuel pump, filter, rebuilt TBI / cleaned and flowed injectors, new 02, new plugs, wires, cap and rotor, newer cat back exhaust and a few other odds and ends...
SES light stays on code 12.
Car seems to run good on initial start up, but once it warms up or goes into close loop she bogs down and trys to stay running and continues too below 500rpms give or take and sounds more or less like it is hunting for idle. the car is timed, i even tried to advance it 3* before hooking in the EST back up... The odd thing is once you shut the car off and try to start it again it will fire for a second then die you'll hear a load woosh come out of the tbi and the engine will rotate backwards less then a full crank rotation, you would think that timing was off but its not which i find odd. I wish i still had my alda cable but i don't... I would like to data log to see, i stil might make a new alda cable... everything seems to be ok im starting to wounder if its the ignition control module? is there a way to bench test the icm?
SES light stays on code 12.
Car seems to run good on initial start up, but once it warms up or goes into close loop she bogs down and trys to stay running and continues too below 500rpms give or take and sounds more or less like it is hunting for idle. the car is timed, i even tried to advance it 3* before hooking in the EST back up... The odd thing is once you shut the car off and try to start it again it will fire for a second then die you'll hear a load woosh come out of the tbi and the engine will rotate backwards less then a full crank rotation, you would think that timing was off but its not which i find odd. I wish i still had my alda cable but i don't... I would like to data log to see, i stil might make a new alda cable... everything seems to be ok im starting to wounder if its the ignition control module? is there a way to bench test the icm?
Senior Member
iTrader: (14)
Joined: Oct 2006
Posts: 823
Likes: 1
From: erlangen, Germany
Car: 1991 Z28 1LE
Engine: LS1
Transmission: T56
Axle/Gears: 3.42
Re: Car hunts for idle?
1988 trans am, stock 305/auto... new fuel pump, filter, rebuilt TBI / cleaned and flowed injectors, new 02, new plugs, wires, cap and rotor, newer cat back exhaust and a few other odds and ends...
SES light stays on code 12.
Car seems to run good on initial start up, but once it warms up or goes into close loop she bogs down and trys to stay running and continues too below 500rpms give or take and sounds more or less like it is hunting for idle. the car is timed, i even tried to advance it 3* before hooking in the EST back up... The odd thing is once you shut the car off and try to start it again it will fire for a second then die you'll hear a load woosh come out of the tbi and the engine will rotate backwards less then a full crank rotation, you would think that timing was off but its not which i find odd. I wish i still had my alda cable but i don't... I would like to data log to see, i stil might make a new alda cable... everything seems to be ok im starting to wounder if its the ignition control module? is there a way to bench test the icm?
SES light stays on code 12.
Car seems to run good on initial start up, but once it warms up or goes into close loop she bogs down and trys to stay running and continues too below 500rpms give or take and sounds more or less like it is hunting for idle. the car is timed, i even tried to advance it 3* before hooking in the EST back up... The odd thing is once you shut the car off and try to start it again it will fire for a second then die you'll hear a load woosh come out of the tbi and the engine will rotate backwards less then a full crank rotation, you would think that timing was off but its not which i find odd. I wish i still had my alda cable but i don't... I would like to data log to see, i stil might make a new alda cable... everything seems to be ok im starting to wounder if its the ignition control module? is there a way to bench test the icm?
Supreme Member
Joined: Dec 2012
Posts: 1,356
Likes: 15
From: northern VA
Car: 88 Sport Coupe Camaro
Engine: V6 2.8
Transmission: Borg-Warner T-5
Axle/Gears: RPO/GU6: 3.42
Re: Car hunts for idle?
Does your heater control valve leak vacuum (hissing behind the dash)?
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