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| | Forums66 Topics128,051 Posts1,055,766 Members48,426 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | Joined: Jul 2013 Posts: 3 New Guy | | New Guy Joined: Jul 2013 Posts: 3 | 52 3100,all original with 216 and rochester carb. was starting and running like a top. was going a little to fast and downshifted causing the engine to backfire. ever since then it wont start worth a darn. has fuel, has compression,has spark. ive tried adjusting the timing with no luck, rechecked point gap, plugs and plug gap, and filed the points. im 99% sure its an ignition issue becuase it wont tart with ether and it doesnt flood out. it starting to drive me crazy, any suggestions? | | | | | Joined: Jun 2011 Posts: 1,901 Shop Shark | | Shop Shark Joined: Jun 2011 Posts: 1,901 | was going a little to fast and downshifted causing the engine to backfire. ever since then it wont start worth a darn. has fuel, has compression,has spark. What is compression on each cyl? Does it hold the pressure (leak down test)? I'm gonna guess it wasn't 'backfire' from over revving the engine...
Give me ambiguity
or give me something else
| | | | | Joined: Jul 2013 Posts: 3 New Guy | | New Guy Joined: Jul 2013 Posts: 3 | got the problem figured out thanks to help from my neighbor. ignition switch is worn enough that its losing .5 volts across the switch. turns out the backfire was an effect of weak ignition and not the cause of the problem. after bypassing the ignition switch not only does the truck start fine, but it runs better and smoother than it has since ive owned it. I wouldn't have thought .5 volts would make that much difference but I guess when you only have 6 volts to start with you cant afford to lose any! | | |
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