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| | | Forums66 Topics128,111 Posts1,056,258 Members48,437 | | 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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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Sep 2010 Posts: 2,315 'Bolter | | 'Bolter Joined: Sep 2010 Posts: 2,315 | MY TRUCK SAT FOR A YEAR AND LAST SUMMER I GOT IT GOING BUT IT WOULD BACKFIRE AND RUN ROUGH WHEN YOU STARTED TO DRIVE IT . I REBUILT THE CARB , NEW WIRES , POINTS , CONDENSER AND CAP . CHECKED THE WIRING AND ADJUSTED TIMING AND CARD IN EVERY WAY . ANY SUGGESTIONS | | | | | Joined: Sep 2010 Posts: 2,315 'Bolter | | 'Bolter Joined: Sep 2010 Posts: 2,315 | SORRY MY TRUCK IS A 1954 GMC WITH A 235 6 CYLINDER | | | | | Joined: Jan 2008 Posts: 4,961 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,961 | If you have stale gas in it, that will cause the valves to stick and it will backfire. Get rid of all of the old gas and put something like Marvel Mystery oil in it and try it again. | | | | | Joined: Sep 2010 Posts: 2,315 'Bolter | | 'Bolter Joined: Sep 2010 Posts: 2,315 | THE GAS WAS DRAINED AND FRESH GAS PUT IN . THE ENGINE WAS REBUILT YEARS AGO BUT HAS ALWAYS HAD THE OIL CHANGED ONLY HAS ABOUT 7000 MILES ON REBUILD . OIL HAS NOT BEEN CHANGED RECENTLY BUT AS I THOUGHT I WOULD GET IT RUNNING PROPELY FIRST. OR SHOULD I CHANGE THE OIL? I ALSO WAS THINKING OF TAKING THE MUFFLER OFF TO CHECK FOR IT BEING PLUGGED BUT THE TRUCK IDELS NICE. | | | | | Joined: Aug 2006 Posts: 108 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2006 Posts: 108 | If your truck is "BACKFIRING" that means that ignition is occurring in one or more combustion chambers while an intake valve is either open or not sealing. This could be due to early timing, a sticking valve ("open" weak valve spring?), improper valve adjustment or a defective valve to valve seat seal (bent valve or scored valve face or seat).
Best Regards
Will
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