sounds like my motor is farting...that is if engines could fart?

65fordguy · #1 (**permalink**) 01-05-2008, 04:16 PM

When Im driving around town I dont hear it but as soon as I put some gas to it, I hear this wierd sound kinda like a engine fart.phhhtttttt hthththththth sort ish.

let off the gas goes away. I dont think they make gas x for this problem. so what do you think? vacuum leak, exhaust leak??

I just replaced the cats, the muffler is realativly new. exhaust note is sweet and strong. until I get on the gas. then all I hear is ....... well im not going to do it again.

Any Ideas..... also I think whatever this is might be effecting my gas mileage because it is baddddd. Just a week ago it was 10 times better after I put the new cats on. I dont get it!!!!!!! one thing after the other!!!

HELP!

LxMan1 · #2 (**permalink**) 01-05-2008, 05:40 PM

Sounds like a clogged cat somewhere, even though they are new.

65fordguy · #3 (**permalink**) 01-05-2008, 05:47 PM

brand new cat clogged? you think? how would it get clogged?

bigblock_drock · #4 (**permalink**) 01-05-2008, 10:52 PM

is it like a bunch of marbles bouncing around ??

kaboom10 · #5 (**permalink**) 01-06-2008, 12:18 AM

Had a muffler clog on me once that sounded like that.

Modified 99 · #6 (**permalink**) 01-12-2008, 08:44 AM

Could it be an exhaust manifold leak?

65fordguy · #7 (**permalink**) 01-12-2008, 04:25 PM

im wondering about the muffler...there was half of the catalytic converter in the y pipe and he said that most of it prob. went out the tail pipe and could of gotten some in the muffler. But it still sounds like a leak. He checked my manifold gaskets with a flame next to them and they didnt blow out or wiggle apparently

streethealer · #8 (**permalink**) 01-13-2008, 05:27 AM

Could it be in the intake tract, like a messed up air filter or the duct work is sucking air through a leak somewhere?

LxMan1 · #9 (**permalink**) 01-14-2008, 04:56 AM

Could be caught up in the muffler!!

streethealer · #10 (**permalink**) 01-14-2008, 05:55 AM

Funny that you say that. I have seen, first hand, a 7.3l psd suck an air filter through a turbo and really mess things up. It wasn't funny then but it is now looking back on it.

1993 E-150 · #11 (**permalink**) 02-01-2008, 07:27 AM

are you sure its the vehicle and not the driver

65fordguy · #12 (**permalink**) 02-01-2008, 09:04 AM

HAHA...nooo.. well depends on what I had for lunch. Just kidding. No its the truck for sure...Its not a sound like I just ate at taco bell and let a wet one. its more like if you S.B.D'd really hard in a tin can....But the guy who installed them said its just the sound of the exhaust going through the cats, that it should go away after awhile. Or, I could wrap them with exhaust wrap to reduce the noise...it isnt that loud. but just awkward sounding if your listening for it.

kaboom10 · #13 (**permalink**) 02-01-2008, 01:26 PM

Quote:

Originally Posted by 65fordguy

HAHA...nooo.. well depends on what I had for lunch. Just kidding. No its the truck for sure...Its not a sound like I just ate at taco bell and let a wet one. its more like if you S.B.D'd really hard in a tin can....But the guy who installed them said its just the sound of the exhaust going through the cats, that it should go away after awhile. Or, I could wrap them with exhaust wrap to reduce the noise...it isnt that loud. but just awkward sounding if your listening for it.

Sounds like a weak sphincter valve........lol

65fordguy · #14 (**permalink**) 02-01-2008, 03:56 PM

o lord. this forum has gone to poot

LxMan1 · #15 (**permalink**) 02-02-2008, 08:28 AM

You shouldn't be able to hear the cats externally. I still think you have old cat material in your muffler.

Add some Beano to the tank on your next fill-up