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97 Silv W/5.0l Won't Start After Sitting

rjirvine

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rjirvine Enthusiast

rjirvine

Posted
Posted

A friend of mine has a 1997 Silverado with the 5.0l engine. The engine will not start after sitting 6-8 hours. It cranks but will not light off. If he tries to start it for 3-5 minutes it will eventually start. Once it starts, it runs fine and if shut off, will start right back up.

 

He changed the fuel filter, air filter, cleaned the MAF sensor, had the fuel pump replaced about 10k miles ago, and changed the coolant temp sensor (for the PCM, not the gauge).

 

If you spray a shot of starting fluid in the throttle body, it will start up just fine.

 

Think it could be the idle air control valve or the computer?

Dread00 Enthusiast

Dread00

Posted
Posted

My 97 van did the exact same thing, I would also spray starting sluid in it and it would stay running just fine. It ended up being my fuel pump.

 

What kind of fuel pump is it?

littleal Enthusiast

littleal

Posted
Posted
A friend of mine has a 1997 Silverado with the 5.0l engine. The engine will not start after sitting 6-8 hours. It cranks but will not light off. If he tries to start it for 3-5 minutes it will eventually start. Once it starts, it runs fine and if shut off, will start right back up.

 

He changed the fuel filter, air filter, cleaned the MAF sensor, had the fuel pump replaced about 10k miles ago, and changed the coolant temp sensor (for the PCM, not the gauge).

 

If you spray a shot of starting fluid in the throttle body, it will start up just fine.

 

Think it could be the idle air control valve or the computer?

littleal Enthusiast

littleal

Posted
Posted

I would look at the fuel pump wiring at the fuel sender. I had a 96 that burnt the wiring where the connector plugged into the sender on the underside of the fuel sender. the repair was to replace the sender. If you pull out the sender and disconnect you will see the connector burnt black where the wire from the fuel pump hooks into it. if that is the problem I would suggest also replacing the pump while you are there.

rjirvine Enthusiast

rjirvine

Posted
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Posted

He replaced the fuel pump relay - no luck.

 

As far as the wiring, wouldn't it cause the problem all the time instead of just during the start?

 

If the idle air control valve were dorked up, wouldn't it throw a code? I'm wondering if it's positioning itself properly for the start.

littleal Enthusiast

littleal

Posted
Posted
He replaced the fuel pump relay - no luck.

 

As far as the wiring, wouldn't it cause the problem all the time instead of just during the start?

 

If the idle air control valve were dorked up, wouldn't it throw a code? I'm wondering if it's positioning itself properly for the start.

littleal Enthusiast

littleal

Posted
Posted
He replaced the fuel pump relay - no luck.

 

As far as the wiring, wouldn't it cause the problem all the time instead of just during the start?

 

If the idle air control valve were dorked up, wouldn't it throw a code? I'm wondering if it's positioning itself properly for the start.

 

littleal Enthusiast

littleal

Posted
Posted

my trk. did what you are talking about and that is what it turned out to be. I was in montana when it happened at a service sta. the only way I got it started was take a mallet and bang on the the bottom of the tank. that was the second time the sender went bad.

  • 3 weeks later...
rjirvine Enthusiast

rjirvine

Posted
  • Author
Posted

Well, it was indded the fuel pump. My friend replaced it and the wiring. He took the bed off instead of dropping the tank, he said it was easier that way (I've never done that, but read it here on the forum). Thanks all!

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