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Old 03-25-2010, 04:28 AM   #1 (permalink)
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Default Sierra Backfiring

I was looking for some possible causes of backfiring , i got a 96 sj80 auto choke carb i just put some carbie cleaner on/in it couple days back just starting backfiring today. Wondering if that has anything to do with it or maybe exhaust? any help would be nice
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Old 03-25-2010, 10:30 AM   #2 (permalink)
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check and make sure you didn't bump a vacuum line loose when cleaning the carb.
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Old 03-28-2010, 01:15 PM   #3 (permalink)
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Quote:
Originally Posted by Baratacus View Post
check and make sure you didn't bump a vacuum line loose when cleaning the carb.
Remove and inspect the spark plugs.

If there is a significant buildup of tannish-gray material on the gap area, clean them. This stuff builds up when you have leaky valve stems, use inferior quality gasoline or you regularly add a fuel additive to your tank.

My '88 started backfiring mildly because of the ash buildup on the plugs. The buildup interefered with providing a strong spark which caused unburned air-fuel mixture to reach the hot exhaust manifold causing a small back fire.

I replaced the plugs and the difference was immediate! No backfires and the engine ran smooth and strong again!
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