aaronlife

Yesterday the car backfired and blew apart the driver's side muffler on start-up.

I seem to recall it backfired once last summer as well, through the carb, and maybe through the tailpipe once.

Maybe 20 years ago a backfire blew apart another muffler, but nothing like that since.

The car is running well, and strong, but perhaps a little uneven (missing on a cylinder on the driver's side?? bad valve?).

Naturally, I'm replacing the blown muffler but I'm a bit concerned about the backfire... presuming fuel in the exhaust?

What could be my possible culprits for the backfire? Was it random? Will it happen again soon? I don't want to blow apart a new muffler.

Btw, i'm replacing the stock 20+ year old 2" system with a 2.5" system from the manifold back, an h-pipe, and probably dynomax super turbos.

Any feedback on that idea is also appreciated as I've been overwhelmed with info on exhausts.

Thank you,

Aaron

oldsonharmont

Get a timing light and check your timing, could be a timing chain starting to go.

Olds64

I would also check timing and carburetor settings before replacing the muffler. Ensure your car is in top running condition.

Jamesbo

X 3

citcapp

I agree check the timing

aaronlife

thanks, i'll start with the timing

Summerof84

Had some nasty backfires turn the muffler into an oval on my 73 S. A new set of spark plugs solved the problem. If one fails to fire for a few seconds, a whole lot of raw gas builds up and Kapow!