idle problems.
Thread Starter
Registered User
Joined: Jan 2002
Posts: 134
From: alden,ny
idle problems.
i have a 87 tpi iroc-z. with a new beefed up motor. i got it to run. but the sicker wont idle. i have my TPS set right. and i have a new IAC.i have no vacumm leaks,.. but i had the stock TB on b4. and i put a edelbrock 58mm on it. im wondering if maybe i have to adjust the screw on the side where the linkage is? anyone have anymore ideas on what it could be? thanks,
shaun
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1987 IROC-Z
355ci, Dart 2.02x1.60, compete forged bottom end, SLP siamesed runners, fully ported Edelbrock manifold and plenum, 58mm TB, Accel 26lb Injectors, Edelbrock headers & y-pipe, Flowmaster 3" cat-back, Rebuilt 700r4, B&M Megashifter, Holley 255lph fuel pump, triple guage pod, !A/C & Heat, !Smog pump, bypassed TB, MJS Ram air, custom PROM, Lakewood control lower control arms, Lakewood adjustable pan hard, Sub-Frames, Hotchkis Strut tower brace, Adjustable Torque Arm, 150hp NOS
IROC Pix
shaun
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1987 IROC-Z
355ci, Dart 2.02x1.60, compete forged bottom end, SLP siamesed runners, fully ported Edelbrock manifold and plenum, 58mm TB, Accel 26lb Injectors, Edelbrock headers & y-pipe, Flowmaster 3" cat-back, Rebuilt 700r4, B&M Megashifter, Holley 255lph fuel pump, triple guage pod, !A/C & Heat, !Smog pump, bypassed TB, MJS Ram air, custom PROM, Lakewood control lower control arms, Lakewood adjustable pan hard, Sub-Frames, Hotchkis Strut tower brace, Adjustable Torque Arm, 150hp NOS
IROC Pix
Registered User
Joined: Nov 2000
Posts: 1,003
From: Grandville/ Grand Rapids, Michigan
How custom is your EPROM? If thats not calibrated correctly your motor WILL NOT idle correctly. Mine doesn't idle correctly yet but I haven't touched the EPROM calibrations.
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-Brad C?
355ci '89 Iroc-Z Red, T-tops, power everything, A4,New 10 bolt w/ 3.73's
Trans-Go shift kit Corvette Servo,Accel 8.8mm wires,Flowmaster 80 series ,K&N's, !MAF Screens, Hollowed out airboxes,homemade Subframes. Kieth Black pistons 10.3:1, Comp Cams 270H (.495/.502 218*/224* 110*LSA) & valve springs, SLP 1 3/4" headers, TCI 2400 stall, Dual Roller timing chain, 2 3/4" I-pipe.
Full street trim best run:14.750/mph:96/60': 2.02 (last year) New Times to come.
Pics of the Iroc
------------------
-Brad C?
355ci '89 Iroc-Z Red, T-tops, power everything, A4,New 10 bolt w/ 3.73's
Trans-Go shift kit Corvette Servo,Accel 8.8mm wires,Flowmaster 80 series ,K&N's, !MAF Screens, Hollowed out airboxes,homemade Subframes. Kieth Black pistons 10.3:1, Comp Cams 270H (.495/.502 218*/224* 110*LSA) & valve springs, SLP 1 3/4" headers, TCI 2400 stall, Dual Roller timing chain, 2 3/4" I-pipe.
Full street trim best run:14.750/mph:96/60': 2.02 (last year) New Times to come.
Pics of the Iroc
Thread Starter
Registered User
Joined: Jan 2002
Posts: 134
From: alden,ny
when i got it burned from fastchip. i gave them a list of everything i have. so that chip is burnt to every aspect of my car..
i even told them i want it to idle at 850.
but ill be working on it 2morrow (fri) and see if anything comes out of it. later
shaun
------------------
1987 IROC-Z
355ci, Dart 2.02x1.60, compete forged bottom end, SLP siamesed runners, fully ported Edelbrock manifold and plenum, 58mm TB, Accel 26lb Injectors, Edelbrock headers & y-pipe, Flowmaster 3" cat-back, Rebuilt 700r4, B&M Megashifter, Holley 255lph fuel pump, triple guage pod, !A/C & Heat, !Smog pump, bypassed TB, MJS Ram air, custom PROM, Lakewood control lower control arms, Lakewood adjustable pan hard, Sub-Frames, Hotchkis Strut tower brace, Adjustable Torque Arm, 150hp NOS
IROC Pix
i even told them i want it to idle at 850.
but ill be working on it 2morrow (fri) and see if anything comes out of it. later
shaun
------------------
1987 IROC-Z
355ci, Dart 2.02x1.60, compete forged bottom end, SLP siamesed runners, fully ported Edelbrock manifold and plenum, 58mm TB, Accel 26lb Injectors, Edelbrock headers & y-pipe, Flowmaster 3" cat-back, Rebuilt 700r4, B&M Megashifter, Holley 255lph fuel pump, triple guage pod, !A/C & Heat, !Smog pump, bypassed TB, MJS Ram air, custom PROM, Lakewood control lower control arms, Lakewood adjustable pan hard, Sub-Frames, Hotchkis Strut tower brace, Adjustable Torque Arm, 150hp NOS
IROC Pix
Registered User
Joined: Dec 1969
Posts: 1,147
From: Phila., PA
THe only change between it running good and running bad is the change in throttle body? Put the stock one back on and confirm this again. Then go over the Edelbrock part and check for anything that looks wrong.
A simple change from a stock TB to a 58 will not cause the idle to go bonkers and won't require a chip reporgram, expecially on a MAF-equipped car. Done this before and never changed the chip and it ran great.
Yes, you have to adjust the idle speed screw on the new TB, but even if you don't it should idle acceptably. Is the IAC plug plugged in correctly and completely? If not it'll usually fire up and immediately idle down to nothing and shut off.
A simple change from a stock TB to a 58 will not cause the idle to go bonkers and won't require a chip reporgram, expecially on a MAF-equipped car. Done this before and never changed the chip and it ran great.
Yes, you have to adjust the idle speed screw on the new TB, but even if you don't it should idle acceptably. Is the IAC plug plugged in correctly and completely? If not it'll usually fire up and immediately idle down to nothing and shut off.
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