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Help! 92 Chevy Truck starts then dies... FIXED!!!

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Philly87

1/2 ton status
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Jul 14, 2000
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Location
El Paso, TX
Hey all,

I'm working on my friends dad's 92. It will fire occasionally then die. It will only run for a couple of seconds then die. I can keep it running by spraying carb cleaner in the throttle body.

It is getting fuel but fuel pressure is questionable as I need to order the adapter to test fuel pressure.

EGR tests good. TPS tests good. IAC tests good. Fuel filter is new.

I'm leaning toward either a bad fuel pump or a bad ignition module.

Any ideas?

I put a fuel pump in this truck about 3 years ago. An Airtex from O'Reilly.

-Phil
 
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You might take out the IAC on the throttle body and clean it, and then clean the cavity in the TBI unit as they can get really dirty.

I'd test the IAC next to see if it works or is frozen in one spot.

Can you start it and keep it running by giving it some gas and not allowing it to run down at idle rpm?
 
I can only keep it running by spraying carb cleaner in it. No ammount of throttle will keep it running.

Stumpbuster, was your bad module in a fuel injected application? If so what were the symptoms?
 
IIRC, the ignition module also controls the injector pulse for it to spray fuel thru the injectors.

You can take the module out and have it tested at a auto parts house. Hopefully that is the problem for a relatively easy fix.
 
What's the mileage on this truck, or the fuel pump, is it original?

If it's original with high mileage, I'd bet on that thing.
 
It won't start at all with a bad module. At least mine wouldnt'. Absolutely no fuel from injectors when mine went.

My guess is fuel pump. Do you hear the pump spool up when you turn the key on?

Try banging on the bottom of the tank, and see if it will start momentarily.
 
Thaks for the input guys. I replaced the pump in the truck about 3 years ago.

When I first crank the motor the injectors will pulse and the truck will start but then dies after the initial hit of fuel is gone.

When I keep it running with the carb cleaner the passenger side of the injector sprays decent and the drives side injector looks pretty weak.

I tried checking codes too but the owner of the truck disconnected the battery while it sat for a couple of weeks so no codes stored.
 
Philly87 said:
Thaks for the input guys. I replaced the pump in the truck about 3 years ago.

When I first crank the motor the injectors will pulse and the truck will start but then dies after the initial hit of fuel is gone.

When I keep it running with the carb cleaner the passenger side of the injector sprays decent and the drives side injector looks pretty weak.

I tried checking codes too but the owner of the truck disconnected the battery while it sat for a couple of weeks so no codes stored.
Click to expand...


I'm thinking pump/filter, not ign module. I got absolutely no fuel at the injectors when my module went.

Just bought teh pressure tester that goes in the filter location, stupid there isn't a better way to test pressure on these.
 
rubber line in the tank. Just did mine simple fix. If the ignition module doesnt fix it. check in the tank. Its easier to pull the bed than drop the tank
 
Again thanks for all the input. I think I'll try throwing a module in real quick tonight to see what happens.

If this doesn't solve it I'll order the fuel pressure tester adapter to check fuel pressure.

Anyone have a good source for these at a good price?
 
Paid 40 something for mine on ebay. Got it pretty quick. Not sure if you want one to keep, or just one to use, but i'll ship you mine for cheap to borrow after i test mine tonight.

Definitely agree to try ign module before fuel pump too....just have a hunch thats not it. Its about $60 if i remember correctly.
 
I'd be testing the fuel pressure before dropping about $40 on that module. Even buying the fuel pressure adapter & gauge, it's still a nice tool to have around, it's always the first thing I check if I have issues like this.

Even with the rubber line in the tank, I somewhat diagonsed it with the help of the fuel pressure gauge. It'll tell you what that's doing and possibly eliminate the question of whether it's a pressure problem or not, which in my past experiences with several fuel injected vehicles of mine,friends & familys, has usually been the biggest issue.
 
I just ordered one from Amazon for $22 plus shipping. Should be here on Monday.

That and luckily I have a few of these modules laying around here at work so I'm gonna take one and pop it in tonight and see what happens.

It won't cost me anything but time so why not.

Results to follow...

dhcomp thanks for the offer on borrowing your adapter. I figured I might as well have one as I need to test the pump in my Blazer anyway thanks to a lean exhaust code 44.
 
Good call on the Amazon deal.

92 doesn't have a funky security system that I know of but now that you mention it this truck does have an aftermarket alarm on it.

Although my experience with those is the vehicle won't even crank.
 
When I went thru this same issue I found that it was more logical to buy the permanent fuel pressure adapter from CFM Technologies(4x4High pointed me in that direction)and a guage. I paid $40 for the adapter and $20 for the guage. It's a nice cheap upgrade. Checking fuel pressure becomes as easy as popping the hood.:waytogo:

Linky: http://marine-performance-parts.com/index.aspx
It's at the bottom left of the page.
 
After almost cross threading the fittings at the back of the TBI about 4 times, i have a hard time thinking i could easily move them enough to get that fitting in there.

Does that one replace the bung that is screwed into the TBI? If so, won't add too much length.....but enough to make it difficult i would think.
 
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