i jsut noticed that right under neath the muffler of my car there this thick black build up of some sort anyone have any idea what it could be... its like right under Keith the muffler...

 

classic symptom of running rich

 

but its not coming out of the exhaust tip ..its actually sitting right underneath the middle of the muffler...

and if it is running rich how to i solve this?

 

sounds like road tar, dust, dirt grime buildup just clean it off, it will be there again soon enough

 

It could be a leak.

 

it could ... it was sitting for two weeks. it was not there b4 the garage was clean...

 

that could have been worth mentioning...

 

wha that it was sitting for 2 weeks?

 

its definitely because it running rich but also there is an exhaust leak, thas a big sign of one

 

what od you mean it's under the muffler? on the muffler itself? or on the bumper

 

The muffler had a small hole in it to drain water out of the system, that water mixed with the extra carbon from running rich could have done that.

 

my car has the same thing..... i noticed it when i had it up on the lift to change my oil and rotate my tires...

 

its under the muffler on the floor like dead center of the muffle on the floor there this dried up black stuff

 

Probably just carbon deposits that came out of your muffler at the same time as some water, so it left a black spot. This happens a lot if you also run CAI makes a lots more moisture run thru the system. If you have ever followed a car that keeps spitting water out the the tail pipe its because of the CAI.

 

Probably carbon. Is it powderlike?


I thought you meant on the exhaust when you posted initially.