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GM Bob
GM Bob, ASE Certified Technician
Category: Chevy
Satisfied Customers: 965
Experience:  30 plus years. experience as GM technician, ASE Master Technician and GM Certified.
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I have a 1997tahoe 5.7. I replaced the disributor and it ran

Customer Question

I have a 1997tahoe 5.7. I replaced the disributor and it ran great. But driving it home from work, it suddenly shut off. I ran through checking for spark and timing and compression and all checked out. The plugs are new. Now it cranks but wont catch and run.
Submitted: 1 year ago.
Category: Chevy
Expert:  GM Bob replied 1 year ago.

Hello my name is Bob.

Sorry for the problem you are having.

Have you checked fuel pressure? Have you tried pour some fuel in the throttler body see if it will start?

Does it sound like it wants to start, backfire,

Customer: replied 1 year ago.
Replaced furel filter then tried the fuel in the theottle body. Backfired throught the intake but no start.
Expert:  GM Bob replied 1 year ago.

Did it backfire with out pouring gas?

I have had some bad cap and rotors before?

Do you still have the old one to try?

Customer: replied 1 year ago.
Already tried using the old one. Only backfires when i put in fuel.
Customer: replied 1 year ago.
Additionally, the code reader i have doesnt give any trouble codes when. I assume this is from disconnecting the battery to keep it from going dead.
Expert:  GM Bob replied 1 year ago.

Not all of the ignition system set codes

Need to ask you do you have the firing order right

Expert:  GM Bob replied 1 year ago.

Have you checked the fuel pressure? If so what was it.

Expert:  GM Bob replied 1 year ago.

You said you replaced the complete distributor?

Why did you replace it?

Customer: replied 1 year ago.
The firing order is correct. Everyone I've spoken to has said it is probably out of timing. I havent checked the fuel pressure yet as I dont have a gauge. What is it supposed to be? Fuel sprayed when i checked to see if it was getting fuel tho.
Expert:  GM Bob replied 1 year ago.

Should be 56-62 psi.

Have you lined up the timing marks to see if it off?

Mark on front cover and the mark on the bottom housing of the distributor. It has the #8 on it. NOT #6 mark

Customer: replied 1 year ago.
There was a lot of play in the old one (normal wear) and the rotor was corroded. I looked up prices and it was cheaper to buy the whole thing.
Expert:  GM Bob replied 1 year ago.

Have you cranked it over to make sure the rotor is turning?

Customer: replied 1 year ago.
Yeah. It turns
Expert:  GM Bob replied 1 year ago.

If you are 100% the timing is correct? Only thing would cause timing to be off. Would be the timing chain.

I have not seen that in a long time.

If it only backfires when you put gas in it. You would think if it was out of time it should backfire all the time.

Need to check fuel pressure.

Low fuel pressure will cause backfire running to lean.

Customer: replied 1 year ago.
maybe some kind of blockage? Is there a secondary pump/fuel relay that could cause this?
Expert:  GM Bob replied 1 year ago.

There is no secondary pump. Only one and it is in the gas tank.

Can you hear the pump run if so? Than the relay and power is good.

Should run for 2 sec after key is turned on or all time when cranking.

As for a blockage you said you already replaced the filter. Not much else can get blocked.

A fuel pressure reading will help on which way to go.

Some auto part store will lend out fuel gauges or rent.

Expert:  GM Bob replied 1 year ago.

Before You replaced the distributor you had no starting problems?

I have seen crank sensors cause a backfire hard start or kick back.

Keep me posted

Thank you

Customer: replied 1 year ago.
62 psi
Customer: replied 1 year ago.
No problems before except a bit of hesitation in 1st gear. Went away after i swapped it out.
Expert:  GM Bob replied 1 year ago.

Have you pulled out any spark plugs see if there is gas on them?

I would crank it over a few times before pulling the plugs. Doing this because the gas may have evaporated over time.

Also try disconnecting the cam sensor on the distributor. If it starts it will set a code for it.

Expert:  GM Bob replied 1 year ago.

Just checking to see how it is going.

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