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Topic: 1987 L98 w/ automatic stalls in traffic, and refires later.

in Forum: C4 Engines

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1987 L98 w/ automatic stalls in traffic, and refires later. (1/9)
4/11/19 8:09pm

hncook51
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Marietta, GA - USA

Vette(s):
1987 Base Coupe Automatic

Joined: 4/8/2019
Posts: 5

Hey guys,

I know this issue has already been addressed on other threads, but I'm at my wits end with this car. I've replaced the EGR valve, fuel pressure diaphragm, fuel pump, fuel pump relay, fuel pressure regulator, fuel pump cooling relay, fuel pump strainer, MAF sensor, TPS sensor, ECC, the PROM chip that goes with it, oxygen sensor, vacuum lines, spark plugs and wires, distributor cap, rotor, ignition module, and vacuum lines. I'm tired of dumping money into this car that does run better, but won't stop breaking down.

Thanks!

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Re: 1987 L98 w/ automatic stalls in traffic, and refires later. (2/9)
4/12/19 9:46am

aldocar
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Joined: 12/3/2016
Posts: 92

Wow. Did you change the fuel filter? I did not see it on your list. The repair manual listed the fuel filter as an item to look at when engine stalls. I am sure a more knowledgeable member will help.

Good luck!!!

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Re: 1987 L98 w/ automatic stalls in traffic, and refires later. (3/9)
4/12/19 1:50pm

hncook51
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Marietta, GA - USA

Vette(s):
1987 Base Coupe Automatic

Joined: 4/8/2019
Posts: 5

Yep, changed the fuel filter a few months ago.

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Re: 1987 L98 w/ automatic stalls in traffic, and refires later. (4/9)
4/13/19 10:42am

Adams' Apple
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Duncanville, TX - USA

Vette(s):
1985 Coupe-L98/Auto,Bright Red/Carmine. 1974 Coupe-L48/4speed, Medium Red Metallic/Black Deluxe.

Joined: 3/18/2009
Posts: 2192

Please give us a little more info on what the car is doing. Stalls and then restarts later is vague at best.

Did you replace the ignition coil also, since it is not on your list either. Fuel cap? Checked the vapor & retune lines from the tank to the canister, along with the purge solenoid? If the tank is not venting properly, it can create a suction inside the tank that can keep fuel from flowing...

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Re: 1987 L98 w/ automatic stalls in traffic, and refires later. (5/9)
4/13/19 11:47am

hncook51
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Marietta, GA - USA

Vette(s):
1987 Base Coupe Automatic

Joined: 4/8/2019
Posts: 5

When I start up the car and it's cold, it usually runs great, but after it's warmed up, and I get into slow speeds, such as approaching a stop sign or a red light, it will start surging, and eventually it will stall. It can't be restarted, requires a tow back home. I replaced the ECC and the PROM chip a few days ago, and that made it worse. It surged and stalled a few seconds after I started it up, when it was cold, before I could back it out of my garage.

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Re: 1987 L98 w/ automatic stalls in traffic, and refires later. (6/9)
4/13/19 8:33pm

Have you checked for any codes set when it stalls? Next time it does stall after starting, before you turn the key off, check for codes(once you turn the key off, the codes will disappear). A scan tool for non-OBDII capabilities is quickest, but assuming you do not have one, on your car, you'll need to jump the "A" and "B" terminals of the diagnostic link(under the driver side dash). With key ON, it will flash the "Service/Check Engine" light. Count the flashes. Codes will appear as slow flashes, then quick flashes. The slow flashes are the first number of the code, the fast flashes are the second number. For instance, a code 45 would be four quick flashes, followed by 5 slower flashes. Each code will flash 3 times, then the next code will flash. Once it has flashed all codes, it will start over again with the first code. If there are no codes, you will see code 12 flash repeatedly.

See if the ECM is seeing something that will shut the engine down....it will at least point you/us in the right direction.

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Joel Adams

My Link

(click for Texas-sized view!) NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

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Re: 1987 L98 w/ automatic stalls in traffic, and refires later. (7/9)
4/14/19 6:59am

gonewild60
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LAKE GROVE, NY - USA

Vette(s):
1988 Black with tan gut 1992 white with red gut

Joined: 4/14/2019
Posts: 2

So the car just shuts down or it stumbles and dies?

get an ohm meter and check each injector cold, then hot...

I have found sometimes the resistance goes way up on faulty injectors, and the computer shuts down.

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Re: 1987 L98 w/ automatic stalls in traffic, and refires later. (8/9)
4/14/19 1:32pm

hncook51
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Marietta, GA - USA

Vette(s):
1987 Base Coupe Automatic

Joined: 4/8/2019
Posts: 5

It suddenly idles rough, then it dies.

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Re: 1987 L98 w/ automatic stalls in traffic, and refires later. (9/9)
4/14/19 3:21pm

hncook51
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Marietta, GA - USA

Vette(s):
1987 Base Coupe Automatic

Joined: 4/8/2019
Posts: 5

I've been using a GM code reader that I bought at Advance Auto parts that's set at the ECMAB position, and I can't get any codes out of it. I've noticed that when the temperature gauge gets to 150 degrees, I think the radiator cooling fans are supposed to come on by then, but they don't, and that's when it shuts off. Also, the fuel pump cooling relay makes a buzzing sound, whether it's hot or cold, but sometimes it doesn't buzz, and when it does buzz, 9 times out of 10 the car will stall. And when I have it in gear, and the air conditioning on full, it'll stall within 30 seconds.

|UPDATED|4/14/2019 12:21:25 PM (AZT)|/UPDATED|

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