popping noise coming out of tail pipe, not back fire

[az1966]

car runs good,, 20 mpg, starts great,,,when I let off the gas or down shift or even sit there and gun the engine and then let off I get this popping out of the tail pipe,,,,, any ideas?

200 ci 6 popper, 2 spd manual tranny ,,a/c

any help ideas help ful,,, THANKS

 

[TCIC 300ci superbeast]

does it sould like your geting fire ball going through the pipe? not a backfire. i have that going on in my truck. is some what rich and i have no cats. if it sound like that your cat may be burnt. i have such a short exh. that you can see the fireballs

 

[The Plankster Prankster]

idle mixture is too rich. your popping noise is a normal symptom. in my experience, there is a fair chance of backfiring when this popping noise is present. if such a backfire happens and your muffler is old, it may split open. ask me how i know
if you lean out the idle mixture it should go away, assuming the carb still responds to that screw (sometimes they don't when they get old)

oh, and if you want to scare your friend while you're beside him on the freeway, let off the gas and get that popping, turn the key off for about 2 seconds, then back on, and you'll get a nice little backfire - enough to light up the side of the road on a dark night bad advice on a stock muffler

 

[TCIC 300ci superbeast]

to get really goo fire balls make it some what rich, start rolling clutch and rev. and let off. if i hit 5G i get a flame 2ft out each side.

 

[Bort62]

does it sould like your geting fire ball going through the pipe? not a backfire. i have that going on in my truck. is some what rich and i have no cats. if it sound like that your cat may be burnt. i have such a short exh. that you can see the fireballs

I doubt he has a cat on his '66... the popping you are hearing is most likely fuel combusting in your exhaust. Lean out your idle mixture and it should go away.

 

[TCIC 300ci superbeast]

well i said two things and one of them has been comfermed by you me and plank. and besides is 1:20 and i need to get some sleep you know how it is. it gets late and you say sh*t that doesnt make sence. like a 66 with cats

 

[shetland]

check your timing. I had the same and I advanced the timing to 12* and reset the points, problem solved.

 

[Ba Mustang]

Mine does that all the time. I actually like the sound though. :roll: My choke is broken so i can't fix it. :roll:

 

[TCIC 300ci superbeast]

i really like it when i engine braked it. just a lot of growling and flames + the spool down

 

[250mav]

when my donut gasket was blown out it would do that

sae with any other car i had that had a rusted out muffler or shortened/opened pipes

 

[jahearne]

when my donut gasket was blown out it would do that

You have an exhaust leak. My flange gasket leaks and pops when decelerating.

 

[The Plankster Prankster]

when my donut gasket was blown out it would do that

You have an exhaust leak. My flange gasket leaks and pops when decelerating.

i have an exhaust leak too, but leaning out the idle mixture caused the symptom to go away.
and that makes sense, the ex leak introduces air to the unburned fuel in the exhaust, and the mixture burns

 

[AZstang66]

The problem lies in carburettor or timing. Changing to a NEW, not rebuilt, carb should fix it.
Also, it is NOT recommended to turn the ignition on then off while driving. You can hole a piston!