Author Topic: Pops no bangs  (Read 291 times)

Offline Eseljaye

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Pops no bangs
« on: October 06, 2020, 11:46:47 am »
98 C10. 22k miles, Carbs rebuilt/serviced about 500m ago.
Once warm/up to running temp, I get mild pops (not real backfire/bangs) from exhaust when decelerating. As far as I can tell carb boots are tight (now) as are bolts holding exhaust header to motor.
Any thoughts on this?
Thanks

Offline Boomer

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Re: Pops no bangs
« Reply #1 on: October 07, 2020, 01:37:17 am »
If you have aftermarket or modified mufflers then it is probably caused by the PAIR valves introducing air into the exhaust.
If you have OEM mufflers (unmodified) then it's probably a leak in the exhaust where the mufflers join the headers, or else the balance pipe under the engine has a hole in it. Either way, air is getting into the exhaust and burning the unburnt gas in the hot exhaust on deceleration.
George "Boomer" Garratt
Wickford, UK


Offline Eseljaye

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Re: Pops no bangs
« Reply #2 on: October 07, 2020, 07:23:00 am »
OEM cans.
Time to take a much closer look at the whole exhaust. yip   ee.
I'm getting quite adept at removing/replacing the fairings. Anyone using "quick release" pins or similar?

Offline Boomer

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Re: Pops no bangs
« Reply #3 on: October 07, 2020, 07:36:28 am »
George "Boomer" Garratt
Wickford, UK