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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: Redneckchevy on April 07, 2006, 10:25:00 PM

Title: Back fire
Post by: Redneckchevy on April 07, 2006, 10:25:00 PM

Just bought new plugs new wires new dist cap and coil pack.new pcv valve. all new fuel lines new vac lines...And its all seald real good no leaks ...its all on right...And i have no emsion stuff ...So any one no y i got a back fire? and o yea its only after i left off the gas ... i think it might be the dist gear...??? ...Its a 1986 k10 4x4 with the V6 4bbl setup  

Edited by: Redneckchevy at: 4/7/06 9:27 pm

Title: Re: Back fire
Post by: DnStClr on April 17, 2006, 04:46:00 PM

Too much unburned gas in the exhaust system is a usual culprit. The fuel ignites in the hot exhaust.
Another cause can be oxygen entering the exhaust system by means of a leak in the pipes someplace.

Title: Re: Back fire
Post by: Z28 c10 on April 19, 2006, 09:27:00 PM

Have you plugged off the air injection lines going to your exhaust manifolds?? I had the same problem on my 4.3 S10 when I opened up the exhaust, between every shift and during downshifting it would be a non-stop backfire. pulled the air injection off of the exhaust manifold and plugged the holes and the backfire disapeared.

 JayTater

 Z28 C10  

Title: backfire
Post by: Redneckchevy on April 22, 2006, 03:47:00 AM

yep that worked out fine i pluged the oped lines and it stoped  thanks

Title: Re: backfire
Post by: Z28 c10 on April 22, 2006, 01:16:00 PM

happy to help.

 JayTater

 Z28 C10