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Originally Posted by moez1010@yahoo.com
Trying to help out a friend here. His old truck will run good at start up and after it heats up it starts to back fire and quits running. After it cools off will run again to that coolant temp and quit.
Has a ported vacuum switch that has been ruled out as we jumped the lines when engine was warm and problem still exists
Says it has been using a lot of gas. Had back fire and blew out the muffler with pieces of his catalytic converter.
I saw a part named Ignition Advance Control Switch that was listed seperate from the ported vacuum switch. Advance switch sounds like it
might be causing this just by name alone.
Truck is old but still has parts available. Any help on this system would be of great help at this point. Today I wrote off as mysery loves company.
Tommorrow I would like to be more prepared.
Thanks and Good luck
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i posted this in the Magnum Area by mistake.
Actual name of switch i/m intereseted in is the Ignition spark advance switch
Thanks