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Help..truck wont start

frankthedog

By frankthedog
in Ask A GM Technician

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frankthedog New Member

frankthedog

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Sorry I originally posted this as a poll. Any help would be greatl appreciated.

 

I have a 1997 5.7L k1500 that I recently took on a 5 hour trip with no issue. The truck has 95k miles and I recently replaced the plugs and wires with oe parts. After the trip I had gotten the P0300 message and thought it may have been due to bad gas that I had picked up so I cleared the code and put some dry gas in the tank and that appearred to clear it up. The next day I parked the truck for a couple days and now it wont start. I pulled #1 plug and it was wet so I I am assuming I am getting fuel, I also got a strong blue spark. When I crank the motor, it spins for about 5 seconds and then bogs downs. Battery has plenty of power. Anyone have any ideas? When I parked the truck it was running fine. No codes are currently on the computer.

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted

Check fuel pressure. Even if it's getting fuel to make the plug wet, if it's not enough pressure, there won't be proper atomization or amount to start the vehicle.

srlbotanical Enthusiast

srlbotanical

Posted
Posted

I may be way off, but here is my two cents... :thumbs:

 

I also have a 97, have you ever replaced the fuel pump? If not, you are probably due. It seems the pump is notorious for failing around 100K.

 

I would have someone crank the engine while you bang on the gas tank with a rubber mallet. You may get it to start if your pump is bad. If it does start for you, get it to where you need to go because it may not start again after you shut it off.

frankthedog New Member

frankthedog

Posted
  • Author
Posted
Check fuel pressure.  Even if it's getting fuel to make the plug wet, if it's not enough pressure, there won't be proper atomization or amount to start the vehicle.

 

 

 

Thanks for the info, I had thought it was getting fuel since when I cranked the motor in would spin for a couple seconds then bog down like it was backfiring. It is the original fuel pump so I am sure its due. I will check fuel pressure tonight and let you know. Would I still get spark from a bad ignition module? Almost feels like trying to start a motor when the timing is off.

frankthedog New Member

frankthedog

Posted
  • Author
Posted
Check fuel pressure.  Even if it's getting fuel to make the plug wet, if it's not enough pressure, there won't be proper atomization or amount to start the vehicle.

 

 

 

Thanks for the info, I had thought it was getting fuel since when I cranked the motor in would spin for a couple seconds then bog down like it was backfiring. It is the original fuel pump so I am sure its due. I will check fuel pressure tonight and let you know. Would I still get spark from a bad ignition module? Almost feels like trying to start a motor when the timing is off.

 

 

 

 

 

I put a fuel pressure gauge on and found 60 psi. When I pulled the distributor cap and rotor, there were some pretty good corosion and track marks. I changed that out and she started right up. Thanks for the help and info.

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