Need Help Diagnosing Popping - Page 2 - Chevelle Tech
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post #16 of 18 (permalink) Old May 1st, 19, 8:45 AM Thread Starter
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Re: Need Help Diagnosing Popping

Originally Posted by sampoerna415 View Post
Maybe just bad gas? My car sits a lot and the fuel quality around here is not great, I kind of had the same issue on a carbureted engine, lots of pops and back fires at random, put sea foam in the tank and cleaned the carb and the problem went away. Perhaps your problem may just be something simple like dirty injectors? Might be worth a try.

A good possibility with the gas'ohol that has been sitting in the tank all winter. I think I did put some stabilizer in there, but who knows how effective it is. As far as the injectors go, I don't know if you can see it with the naked eye, but the spray pattern in the TB seems consistent between the 4 injectors

67 Chevelle 454, M21
Gen IV 454 (out of C30 ), 390 heads 1.88/2.19 valves by Vortecpro, with ISKY Hyd Roller cam (at 050 218 int./228 exh, lift 530 int./552 exh.), RPM performer intake, Fitech 600HP, Dougs headers, and M21, Gear Vendors OD, 3.73's, UMI Suspension, Viking coilovers.
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post #17 of 18 (permalink) Old May 1st, 19, 9:09 AM
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Re: Need Help Diagnosing Popping

You can use a timing light pointed at a throttle body injector to see the spray patterns.
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post #18 of 18 (permalink) Old May 7th, 19, 6:51 PM
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Re: Need Help Diagnosing Popping

Popping out the exhaust can also be caused by an air leak at the exhaust manifold allowing fresh air into the hot exhaust and the un-burned fuel igniting.

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65 Chevelle L79 since Feb 1965

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