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TBI no start, but runs after starter fluid

CHVYPWR

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CHVYPWR Enthusiast

CHVYPWR

Posted
Posted

I'm sure it's been asked before, but I couldn't find what I was looking for in the search.

I've got an '88 1500 2wd w/ 5.0 that won't start and I cant hear the fuel pump turn on with the key, and get no injector pulse while cranking. But, once I spray starter fluid in the TB it starts and runs great with great throttle response. This truck has 170k+ miles and has been sitting for probably 6 months. Any thoughts?

vortec22 Enthusiast

vortec22

Posted
Posted

I believe there is a relay that gets power and sends it to the pump while the key is in the start position. Once the engine starts, power gets to the pump through an oil pressure switch. I wouls say that you have a broken wire or a bad relay in the circuit that powers the pump during cranking. I dont' remember which one it is, if I figure it out I will let you know.

Cadha13 Enthusiast

Cadha13

Posted
Posted

There is crank signal wire right off the starter that bypasses the oil pressure switch and turns on the pump that way. did you replace the stater or wiring there?java script:emoticon(':puke:')

smilie That's how the pump works on crank position of the ignition key and sends a voltage to the relay through the starter. Hope that helps

CHVYPWR Enthusiast

CHVYPWR

Posted
  • Author
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There is crank signal wire right off the starter that bypasses the oil pressure switch and turns on the pump that way. did you replace the stater or wiring there?java script:emoticon(':confused:')

smilie That's how the pump works on crank position of the ignition key and sends a voltage to the relay through the starter. Hope that helps

 

 

 

 

 

I'll have to check into that. I just swapped out the starter due to a junk solenoid that wouldn't let the starter stop even with the key off. Also, the person who put that starter in had the + cable installed right up against the exhaust manifold, which is probably what killed the solenoid, which lead to the chewed up flexplate that I also had to replace. I swear, some people just shouldn't work on cars :puke:

 

I had it running tonight by cranking it long enough to get the oil pressure up. Once the gauge hit 30psi it fired right up and ran great.

frdfandc Enthusiast

frdfandc

Posted
Posted

The reason why your vehicle will only run on the starter fluid is that your engine is not getting fuel. It could be either your fuel pump relay or fuel pump itself.

CHVYPWR Enthusiast

CHVYPWR

Posted
  • Author
Posted
The reason why your vehicle will only run on the starter fluid is that your engine is not getting fuel. It could be either your fuel pump relay or fuel pump itself.

 

 

 

 

 

Re-read the first post. It gets fuel after it fires up on starter fluid.

 

I havn't had a whole lot of time to dig into this since first posting. I did get a chance to check the relay and it's fine and getting power. Havn't got around to checking that starter wire idea yet though.

CHVYPWR Enthusiast

CHVYPWR

Posted
  • Author
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Well, all this and all it seemed to be was a bad connection at the relay. I unplgged the fuel pump relay, plugged it back in and everything works as it should. :devil::lol: Thanks to those who offered suggestions :cheers:

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