4.3 v6 POPPING BACKFIRE THROUGH CARB ON ACCELERATION

[Ckp]

i Have a 1995 gmc sonoma 4x4 with a 4.3l v6, when accelerating, it will pop through the carb? it only does this a couple time, sometimes only once and then accelerates?, which is more likely fuel pressure, vacuum leaks, distributor cap and wires? appreciate the input thanks!

[Scotty V]

I would check your Distributed cap and rotor. If you have the TBI engine. 

Or If you have done any maintenance right before this problem started you can start there.

[dna9656]

Back fires are usually a timing issue that's why Scotty referred you to the distributor. That thing has to go back just like it came out. Get a Haynes, it'll tell you how to get the engine (get the No. 1 piston up on TDC) in the correct position and how to insert the distributor.

BTW unless some one changed things on your truck (doubtful) GM installed it's last carburetor sometime in 1986 or 1987.

Edited June 8, 2022 by dna9656