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#1 |
Registered User
Join Date: Oct 2003
Location: Lexington, KY
Posts: 151
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Backfiring Back Through the Carb
I have an 85 SWB Chevy, 2wd with a 305 and a TH350C. Over the last couple of weeks, it has developed a problem with backfiring back up through the carburetor. The engine is original with a Q-jet on it. It has about 135,000 miles on it. The Q-jet has been replaced at some point with Holley reman unit. I rebuilt the reman carb again last winter. It has been fine since then. The backfiring occurs mostly after the engine is really good and warm. It happens as I am squeezing on the gas pedal, like when pulling out or giving it more gas to go up a hill. Sometimes it is pretty bad and sometimes it doesn't do it at all. Timing, plugs, plug wires, etc. are all good. For some reason, I want to say that this is ignition related, but I'm not for sure. I've never seen a carb issue be this intermittent. Any suggestions?
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49 Chevy 3100 69 Camaro Acro Sport II Biplane |
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