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Exhaust popping under hard acceleration
Hey guys,
IÂ’m hearing popping/backfire only under hard acceleration, usually starts after 3000 rpm, and only hearing it from the passenger side pipe. At each pop I can feel an extremely brief loss of power, similar to a misfire. Could this loss of power be due to expansion upon detonation in the exhaust which is causing exhaust valves to open during power stroke? I donÂ’t believe itÂ’s missing at low rpm, as it actually runs very smoothly at idle and lower speeds. Have driven the car since new, now has 8,000 miles and first time IÂ’ve experienced this. Please chime in.
Some more info on the car:
427W
Holley 750 carb 4 barrel
Champion spark plugs
MSD distributor
3/8” fuel line, mechanical pump
Running 91 pump gas with octane booster
Thanks guys
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