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Old 07-28-2019, 03:04 PM   #1
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Backfire Problems

I have a 1987 Bounder with 454 chevy engine. Had problems with the Rochester 4bbl carb so took it out and sent it into be rebuilt. After getting it re installed and all lines and hose hooked back up I started it and it ran great. until....I turned it off, about 2 seconds after the engine has stopped it backfires thru the exhaust. It didnt do this before the rebuild. This thing is about to drive me crazy. Anyone have this happen?
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Old 07-28-2019, 04:53 PM   #2
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It sounds as if the idle stop solenoid has failed. It is difficult to find a good carburetor shop now days, as fuel injection has eliminated most fuel system problems and the technicians have long since retired, but try to locate a shop that specializes in performance tuning of carburetor equipped vehicles and they will be able to sort the problem. An off road or four wheel drive performance shop will usually have someone they can recommend to fix this issue.
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Old 07-28-2019, 05:01 PM   #3
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The idle should be controlled by a small electric solenoid near the throttle linkage. With the key on it opens the throttle to idle speed.

There is also a idle speed screw. That would be set so the engine stalls out if the solenoid is disconnected.

That way, when you shut off the key, the throttle close completely, hopefully not pulling in gas/air mixture that causes the backfire or in some cases run on, from hot carbon spots.
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Old 07-28-2019, 05:23 PM   #4
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It could also be caused from the engine idling too fast.
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