Need help diagnosing engine stalling trouble.. Need some opinions

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May 31, 2001 | 04:38 PM

89Formula

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Joined: Jul 1999

Posts: 2

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From: Lemont, IL usa

Need help diagnosing engine stalling trouble.. Need some opinions

My buddy has a 91 Z with a 305 TPI thats been acting retarded lately. First problem: When engine is started, it starts up but dies right away. This happens mostly when the engine is cold. Problem two, when the car has to make a hard, sudden stop, he can bring the car to a halt, then the car inadvertly applies power, and luges forward, while he's holding the brake. Now lately the car has been dieing while hes driving. After cruising, when he lets up off the gas the car dies. What could be these problems be associated with? The car has TES Headers, new plugs, Taylor wires, and we just changed the fuel filter. The problem seems to temporarily go away when the IAC is unplugged and reset. Also these problems don't always happen of course, just more and more. Gimme some ideas guys...

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Jun 1, 2001 | 02:53 PM

1987GTA350

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Joined: Jun 2001

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From: Cincinnati. OH USA

i have the same exact problems but i can't figure out what is causing them!

Jun 1, 2001 | 03:20 PM

Pukka

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Joined: Jul 2000

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From: Where the chicks absolutely LOVE the V-8 rumble!

Car: 92 RS - Fully Restored w/Custom Int

Engine: LO3 with some mods

Transmission: T-5

Axle/Gears: 3.42 Richmond

Not too knowledgeable on TPI, but I'd check the MAF sensor for the stalling and Throttle position sensor for the surging.

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92 Camaro RS, LO3, 5-spd, T-tops

Performance:
K&N Open Air Filter, Edelbrock performer TBI intake, Fastchip Prom, Timing +4 degrees, Centerforce clutch, Xact 8mm wires, SLP 1 3/4" Headers (coated), Flowmaster Catback Exhaust, Z28 Grille w/aftmkt fog lamps, MacEwen white-face guages
Electronics:
Alpine 8030 Alarm System, Valentine One Radar Detector (How did I ever drive without one?), Pioneer DEH 7450 Head Unit w/6-pack CD changer, Pioneer DEQ 7600 Sound Processor, 2 Kenwood KAC-846 Amps powering 2 12" Pro Red subs, 2 Pioneer 6x9 and 2 MTX 4x6 speakers.
NEXT UP: TBI mods, 3.42 gears w/Torsen posi

Jun 2, 2001 | 10:04 AM

8Mike9

Supreme Member

Joined: Jul 1999

Posts: 5,183

Likes: 42

From: Oakdale, Ca

Car: 89 IrocZ

Engine: L98-ish

Transmission: 700R4

No MAF on the '91.

Could be time to pull the TB off and take it apart and thouroughly clean it out with carb cleaner and a tooth brush, get all the passages as well as the TB bores.

If the IAC isn't bad, could be that the passages are just gummed up with time.

Jun 2, 2001 | 11:07 AM

Paul Riccioli Jr

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Posts: 1,198

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From: Bound Brook, NJ USA

Car: 89 IROC-Z

Engine: 383

Transmission: 700R4

It could be the IAC, TPS, MAF, or maybe the computer. I just had a problem with mine stalling everytime I took my foot off the gas. It turned out to be that my ADS aftermarket chip went bad.

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Riccioli Performance Motorworks

--RPM Racing--

-Currently building first ever engine. 383 with Super Ram plenum and runners, Edelbrock lower intake, Bosch 24# injectors, AFR 190 heads, MSD ignition.
-Will be installing Baer Brakes
-Will be installing full Spohn suspension in rear
-Art Carr 700R4 trans??

Attention Everyone!!! I will be changing my name on the message boards to HardcoreZ28 sometime in the near future. Just wanted to let everyone know.