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02 avalanche, turns over but won't start.

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02 avalanche, turns over but won't start.
Submitted: 2 years ago.Category: Chevy
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Answered in 13 minutes by:
2/3/2016
Chevy Mechanic: Tim's Auto Repair, mechanic replied 2 years ago
Tim's Auto Repair
Category: Chevy
Satisfied Customers: 16,247
Experience: Have owned a repair shop for 25 yrs.
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Hi, My name is ***** ***** for the delay.

I will do my best to assist you

how and when did this problem begin?

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Customer reply replied 2 years ago
Sunday afternoon.
Chevy Mechanic: Tim's Auto Repair, mechanic replied 2 years ago

what does it do when you try to start?

does it fire?

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Customer reply replied 2 years ago
I drove it home Saturday night, no problems. Sunday late morning I tried to start it, it spun the engine but didn't fire at all. Like it's out of gas or has no spark. It has a half tank of gas. I used to work on old cars and understand engine basics so I figured I would replace the coil. Then I realized that it has 8 coils, so I doubt that all 8 died at once. I checked all fuses and switched the fuse like square from the starter slot and the ignition slot to test. It still spun with no fire.
Chevy Mechanic: Tim's Auto Repair, mechanic replied 2 years ago

ok

do you hear the fuel pump in the fuel tank come on when you first turn on the ignition?the pump should come on for 2 seconds

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Chevy Mechanic: Tim's Auto Repair, mechanic replied 2 years ago

will it fire with a prime?starting fluid or a little fuel into the throttle body.

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Customer reply replied 2 years ago
Oh, and the fuel pump was replaced a couple of months ago.
Chevy Mechanic: Tim's Auto Repair, mechanic replied 2 years ago

still it doesnt mean that the pump is working

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Chevy Mechanic: Tim's Auto Repair, mechanic replied 2 years ago

do you hear it?

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Chevy Mechanic: Tim's Auto Repair, mechanic replied 2 years ago

are you there?

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Customer reply replied 2 years ago
Sorry for the delay. Yes I hear the pump when I turn on the ignition. It sounds like a small whirring sound for 2 seconds as you say. I haven't tried starting fluid, I will tomorrow. I feel like there is no spark. I will also try a timing light to see if there is spark.
Chevy Mechanic: Tim's Auto Repair, mechanic replied 2 years ago

ok

let me know if it will fire with a prime,,if it fires with a prime,,it has a spark

thanks

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Customer reply replied 2 years ago
It fired with a prime.
Chevy Mechanic: Tim's Auto Repair, mechanic replied 2 years ago

ok..if it fired with a prime we know it has a fuel problem..

the next thing to do is you need to check the fuel pressure,though the pimp may be running it may not have enough fuel pressure,these must have no less than 55psi at all times..

if the fuel pressure is good,you need to test the fuel injector pulse,,if you have no injector pulse,i would think the problem is the crank sensor,the crank sensor is in the side of the engine block just above the starter motor

thanks

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