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99 Silverado Won't Start / No Obd2 Codes Found

JimChooz

By JimChooz
in Ask A GM Technician

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JimChooz Enthusiast

JimChooz

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I have a '99 Silverado. Replaced the fuel pressure reg about 3 years ago, pump and filter last summer. No previous problems, it's been around 5-20 degrees here. Filled up gas 4 days ago. Started fine yesterday at 4:30 am. Would not start last night or today. Engine cranks. Ran code test, no codes found. HELP!

JimChooz Enthusiast

JimChooz

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Are you getting fuel pressure? What engine is this on?

 

5.3 V8. Only thing I have checked so far are codes. Snowing and 10 degrees. Bundling up here shortly and start process of elimination.

HawkScot Enthusiast

HawkScot

Posted
Posted

It may be as simple as some ice in the gas lines, happens alot this time of year with the cold weather. If it is in the garage, warm things up a bit and see if it helps. You may need to get some additive for your gas tank.

JimChooz Enthusiast

JimChooz

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It may be as simple as some ice in the gas lines, happens alot this time of year with the cold weather. If it is in the garage, warm things up a bit and see if it helps. You may need to get some additive for your gas tank.

 

 

Thought of that too...... no garage though and temp supposed to stay at 10-20 for the next week.

Indy Enthusiast

Indy

Posted
Posted

Remove a plug wire and connect it to a spare plug, hold it to the block and have someone crank the engine to see if you have spark. If you do then the problem is fuel. You could try gasline antifreeze. A small squirt of ether(quick start) into the intake will sometimes do the trick too. Don't crank the engine for too long or the unburnt fuel will wash down and you'll have to change your oil.

JimChooz Enthusiast

JimChooz

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Finally above 35 degrees today. Turned key and engine tried to fire for a sec then same old crank no fire. Shot starting fluid and engine runs 3-4 sec and dies. Tried pressure test and reading wes zero. Pulled filter.... seems clear/clean. I can't say that I hear the pump power up. Just replaced it 8 months ago.

JimChooz Enthusiast

JimChooz

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Finally above 35 degrees today. Turned key and engine tried to fire for a sec then same old crank no fire. Shot starting fluid and engine runs 3-4 sec and dies. Tried pressure test and reading wes zero. Pulled filter.... seems clear/clean. I can't say that I hear the pump power up. Just replaced it 8 months ago.

 

 

Just checked the PRIME terminal and it's good.

fixitmann Enthusiast

fixitmann

Posted
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If you cant here pump power up and prime is good try rapping on bottom of front tank strap with rubber mallet, sometimes pump will stop on bad commutater. retry key on cycle.maybe this will help. Really dont matter anymore how old things are have got things inoperative right out of the box many times.Let us know ,with all the talent in here you will be running in no time.I assume you have checked all fuses.

JimChooz Enthusiast

JimChooz

Posted
  • Author
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If you cant here pump power up and prime is good try rapping on bottom of front tank strap with rubber mallet, sometimes pump will stop on bad commutater. retry key on cycle.maybe this will help. Really dont matter anymore how old things are have got things inoperative right out of the box many times.Let us know ,with all the talent in here you will be running in no time.I assume you have checked all fuses.

 

Thanks for all the input, I definately appreciates it. True on the bad out of the box. 1st fuel pump I put in last year was DOA. FUSES all good. Right now trying to find where to put a stop in fuel return line to check pressure. I will try the rapping on the tank.

 

Jim

JimChooz Enthusiast

JimChooz

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Her's my update and then my "Novice" diagnosis. Warmer again today... 42 degrees. Truck did try to fire briefly then the same old thing. ZERO pressure at test port, cannot find a simple way to put stop in to identify or rule out regulator.

 

So................ if I take the regulator out..... turn key on..... shouldn't I get some gas bledding or shooting out of the hole if the pump was working properly???? Tried it... no gas... no pressure.

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