Chevelle Tech - View Single Post - Need Help Diagnosing Popping
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post #9 of (permalink) Old Apr 16th, 19, 9:19 AM Thread Starter
mdelgado
Tech Team
Mike
 
Join Date: Jun 2013
Location: Boston
Posts: 744
Re: Need Help Diagnosing Popping

No luck last night. I pulled the cap hoping to find some moisture or tracking and nothing, it was clean. I ran the car at dusk and couldn't find any arching either. My temp gun should arrive today and hopefully see what header is off. I did pull the plugs again after the engine warmed up. The color looked more consistent. There wasn't one wet plug like before. If the popping is due to a valve adjustment, think a comp test would tell? Thinking if one is stuck open a bit? Because popping would be fuel bleeding into the exhaust stroke, right? And my concern is how this is effecting my AFR. With the Fuel injection, my one o2 is in that header

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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