Author Topic: 454 popping through exhaust  (Read 4296 times)

Offline 76k104x4

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454 popping through exhaust
« 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?

Offline rich weyand

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Re: 454 popping through exhaust
« Reply #1 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.
Rich

"Working Girl": 1978 K-10 RCSB 350/TH350/NP203 +2/+3 Tuff Country lift

Offline 76k104x4

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Re: 454 popping through exhaust
« Reply #2 on: July 17, 2014, 09:37:54 am »
Did both of those same problem on the same cylinder also it is firing.

Offline rich weyand

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Re: 454 popping through exhaust
« Reply #3 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.
Rich

"Working Girl": 1978 K-10 RCSB 350/TH350/NP203 +2/+3 Tuff Country lift

Offline 76k104x4

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Re: 454 popping through exhaust
« Reply #4 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.

Offline rich weyand

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Re: 454 popping through exhaust
« Reply #5 on: July 17, 2014, 10:59:00 pm »
No problem.  Glad you got it sorted.
Rich

"Working Girl": 1978 K-10 RCSB 350/TH350/NP203 +2/+3 Tuff Country lift

Offline HAULIN IT

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Re: 454 popping through exhaust
« Reply #6 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

Offline 76k104x4

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Re: 454 popping through exhaust
« Reply #7 on: July 20, 2014, 09:37:29 pm »
If it ain't broke don't fix it!

Offline bd

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Re: 454 popping through exhaust
« Reply #8 on: July 20, 2014, 09:38:50 pm »
Good reply!
Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)