Archived Starting and idling troubles

[Loghead]

'97 12V 4x4 2500

Sometimes the truck will start, sometimes not. When it does start, it will only run for 10-15 seconds.

I've observed the fuel shutoff solenoid activate while the starter is turning.

I've read that the fuel lines can develop nearly invisible leaks which could cause this problem, so I ordered some new fuel lines from Larry B's. I also plan to replace the fuel filter.

Not wanting to miss some other obvious thing, I'm asking you folks for suggestions.

Thanks

 

[Missouri Mule]

The rubbber fuel lines are the most likely cause but hard to start problems can be caused by a bad lift pump (matter of fact the symptoms are the same).



The fuel shut off solenoid relay could be on its last leg ( working somtimes).



Shutting off after 10 to 15 seconds is probably caused by your idle being to low. It is not to hard to adjusts just a pain to reach the adjusting screw.

Automatic trans; 750-800 rpm with trans in drive and a/c on.

Manual trans; 780 rpm with trans in neutral and a/c on.



You can adjust idle higher if need be.

 

[Joe G.]

Email me at -- email address removed -- for my write up on the 12 valve fuel supply system, how it works and how to fix it.