this shop I was talking to was lloking at my car today, and he pointed out how black my exhaust tips were from the inside, almost like a blackboard. I thought to myself that it wasn't a huge deal, but then he told me how much black dust was all over the rear of my bumper and trunk, which I noticed all the time, but never figured it was from that. He even told me that my exhasut wasn't white, but rather a dark grey. What could be the problem and solution?

 

possibly running rich? I had that problem after I installed I/H/E on my 98 prelude. I never really got it adjusted, just sorta went with it till she sold...

 

The inside of the magnaflow tips of my car is dark (same as you describe) yours and all I have is an intake. No black dust on my bumper, but I have a black car so I may not notice it. I don't think its need for concern.

 

running rich i have that prob.

 

can anything be done to lean out the CLS 6mt a little? Is there anything that can be adjusted? thanks

jim

 

Doesn't the CL-S naturally run rich?

Well, if your concerned about the car running rich, maybe a fuel management system (emanage) can be used to lean it out a bit.

 

ron, the black dust is probably carbon from your headers, I dont remember if the headers cut out any cats for the acura cl-s, but i know with my IS I have this problem with the black sut bc I have no cats and normally on a stock Is theres 3.


heres closeup pic of my dragger, all that discoloring is sut built up its not burnt bc i can wash it off. thank god im switch to a full rear bumper instead of a lip so it wont look like that anymore nor crack the paint from too much heat.

 

you dont even have to go that far, a S-AFC would probably do the trick.

 

I have ben searching and I cant figure out what the S-AFC is. So what is it and what does it do? How do you tune it?

 

Well, I have HKS Super dragers, and and AEM CAI, and a set of OBX crap headers that have a crack in one of the welds with black sut around it. The mechanic mentioned that I am probably running rich.
1.) Does that have any adverse affect on perfortmance?
2.) MPG?
3.) How can I fix it without modding anymore. is there a way to just adjust whats already on the car?

 

I didnt see a drastic drop in MPG, but then again I wasnt watchin for it. It could also be your O2 sensor isnt working anymore. My guess is since the car is running rich, there will be a slight drop in MPG. Performance wise, prolly not since WOT has both mixtures running as much air and fuel as possible anyway. Good luck

 

I hope its not the O2 sensor, I would guess that if it went out, I would get some dashboard lights. It happened before when the OBX bung was in the way of the oil pan. I guess I'll take it to a mechanic to see what can be done.

 

Running rich will burn up your plugs. Also decrease MPG. Usually a bad sensor is accompanied by a CEL.

I would run a WB sensor on your exhaust and see if it's running ~14.7:1 at idle. That is a good way to see how your car is doing.

 

I think it's normal. The CLS be design runs rich. My rear bumper & CT mufflers are the same way. They were the same on my old 6MT & the 02 Auto I had.

 

I had the same thing with my Comptechs. The mechanic said it was running rich, but it was nothing to worry about.

 

Same here.