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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: 76k104x4 on July 16, 2014, 09:10:52 pm

Title: 454 popping through exhaust
Post by: 76k104x4 on July 16, 2014, 09:10:52 pm
I just installed a new distributor with new rotor and cap, new coil, and new wires I got the truck running good except a backfire in the exhaust on #6 cylinder. It only does it at idle I also put a new plug in #6 it didn't help any. Anybody got any ideas?
Title: Re: 454 popping through exhaust
Post by: rich weyand on July 17, 2014, 12:23:49 am
Swap the wire with the wire on another cylinder, and see if the problem moves.  Another option is to clip the timing light on that wire and see if it triggers.
Title: Re: 454 popping through exhaust
Post by: 76k104x4 on July 17, 2014, 09:37:54 am
Did both of those same problem on the same cylinder also it is firing.
Title: Re: 454 popping through exhaust
Post by: rich weyand on July 17, 2014, 11:11:39 am
Re-check the firing order of the wires on the distributor.

Re-torque the header/manifold bolts on the passenger side.
Title: Re: 454 popping through exhaust
Post by: 76k104x4 on July 17, 2014, 07:18:04 pm
I did those things still had the problem but I got it solved. I had ordered a Accel HEI corrected cap apparently something wasn't right with it because I put a regular HEI cap on it and it runs beautifully now with tons of power. Thanks for the help though.
Title: Re: 454 popping through exhaust
Post by: rich weyand on July 17, 2014, 10:59:00 pm
No problem.  Glad you got it sorted.
Title: Re: 454 popping through exhaust
Post by: HAULIN IT on July 20, 2014, 08:52:11 am
I got it solved. I had ordered a Accel HEI corrected cap apparently something wasn't right with it because I put a regular HEI cap on it and it runs beautifully
And your lesson for today is??? ;) Lorne
Title: Re: 454 popping through exhaust
Post by: 76k104x4 on July 20, 2014, 09:37:29 pm
If it ain't broke don't fix it!
Title: Re: 454 popping through exhaust
Post by: bd on July 20, 2014, 09:38:50 pm
Good reply!