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Tim's Auto Repair
Tim's Auto Repair, mechanic
Category: Chevy
Satisfied Customers: 15478
Experience:  Have owned a repair shop for 25 yrs.
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02 avalanche, turns over but won't start.

Customer Question

02 avalanche, turns over but won't start.
Submitted: 10 months ago.
Category: Chevy
Expert:  Tim's Auto Repair replied 10 months ago.

Hi, My name is ***** ***** for the delay.

I will do my best to assist you

how and when did this problem begin?

Customer: replied 10 months ago.
Sunday afternoon.
Expert:  Tim's Auto Repair replied 10 months ago.

what does it do when you try to start?

does it fire?

Customer: replied 10 months 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.
Expert:  Tim's Auto Repair replied 10 months 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

Expert:  Tim's Auto Repair replied 10 months ago.

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

Customer: replied 10 months ago.
Oh, and the fuel pump was replaced a couple of months ago.
Expert:  Tim's Auto Repair replied 10 months ago.

still it doesnt mean that the pump is working

Expert:  Tim's Auto Repair replied 10 months ago.

do you hear it?

Expert:  Tim's Auto Repair replied 10 months ago.

are you there?

Customer: replied 10 months 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.
Expert:  Tim's Auto Repair replied 10 months ago.

ok

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

thanks

Customer: replied 10 months ago.
It fired with a prime.
Expert:  Tim's Auto Repair replied 10 months 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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