Dark Color Coated in Exhaust Pipe

Hi Guys,

After doing some searching and browsing for my answer I still have not found anything. Question is, I notice dark almost black residue on the rear fender when I bought my 05 with 108k miles. Most of it was cleaned off when I had it all detailed in and out. But I recently put a wicked flow muffler on and used the stock piping and it still has this dark build up on the exhaust tip? Almost looks like a diesel sometimes! lol

Id imagine its some kind of carbon build up or maybe im running rich? I replaced the stock air filter and used carbon cleaner on the maf and throttle bottle at 108k miles.

Is this somewhat normal or maybe something to look into? Any feedback or suggestions would be much appreciated! Thanks in advice.

 

These trucks tend to run rich. I have a similar issue with my white Tacoma. I'm pretty sure it's excess fuel coming out of the tailpipe

 

What a waste of gas

 

Can this be fixed or improved? Like changing spark plugs or cleaning anything? Id imagine its not a huge deal but just would like to do what I can. haha

 

Dump the exhaust you wont notice it

 

Wonder why they tend to run a little rich? Guess that would be better than lean.

Brett

 

^^^Exactly. I believe if you install a urd MAF calibrator you can clean up the mixture and make it a little better.

 

That would make sense to run more rich than lean, but mine (or maybe others too) seem to run too rich. Especially to the point of coating my rear fender with exhaust. Ill look into the urd maf, but anyone come up with some good tune up tactics feel free to add anything!

I think Ill start with replacing the spark plugs, 1. because it probably needs to be done at 115k miles, and 2. it may help run cleaner/more efficient.

Good thing is I can monitor the color of the exhaust due to the chrome tip. I can clean it and see if it builds up faster or not after making changes.