Backfires and stalls when warm only
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Joined: Jan 2010
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Backfires and stalls when warm only
The truck is a 78 E-250 Quadravan with a 460 and Carter carb. It was running fine, but a little rough before. It sat for a few months. The problem is that I can start it cold, but once it reaches a certain point, 3-4 minutes later, it will sputter, lose power, then backfire through the carb. Goosing the gas pedal will make it run a little longer, but I get more backfiring then. I have changed the oil, replacing one qt with Marvel Mystery Oil. I have replaced all the plug wires as well.
I do not have a big budget to have heads rebuilt or timing chain/cam redone, and I cant do it myself. Before I sell this beast, is there anything else that I am missing?
Thanks!
I do not have a big budget to have heads rebuilt or timing chain/cam redone, and I cant do it myself. Before I sell this beast, is there anything else that I am missing?
Thanks!
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Why are you changing oil and replacing plug wires when you obviously have a carburetor problem. Get a rebuild kit and a dip basket carb cleaner. Pull the carb, disassemble, soak it in the cleaner and reassemble with the kit, making all adjustments described in the instructions with the rebuild kit.
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Joined: Jan 2010
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Thanks for the advice. I changed the oil simply because it was sitting. I thought having fresh lube might help a gummed up valve, if that were the problem. It needed doing anyway. The plug wires seemed more obvious to me, since they are pretty old and electromagnetic induction could allow a cylinder to fire with the intake valve open.
I have an edelbrock 1407 carb that I rebuilt a couple of weeks ago. I can try that this weekend.
I have an edelbrock 1407 carb that I rebuilt a couple of weeks ago. I can try that this weekend.
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