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Black spots on rear bumper...exhaust?

 
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Old 12-11-2012, 08:51 PM
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Black spots on rear bumper...exhaust?

I bought a Prelude this summer that is mostly stock except for the exhaust. I've noticed that after I wash my car, small black spots start to form all over the rear bumper. I think it's coming from the exhaust.

I've done some research, and I've read that's it's not really a concern and that my car is just running rich? Not sure what that means. Is it burning oil or something? I don't drive the car hard at all, usually shift around 2.5k. I hope this doesn't cause me to fail my do emissions test when that comes up.
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Old 12-11-2012, 08:54 PM
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Re: Black spots on rear bumper...exhaust?

Soot, means you're burning a tad rich. not really an issue as our cars tend to do that as is
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Old 12-11-2012, 10:12 PM
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Re: Black spots on rear bumper...exhaust?

typically there's a bit of moisture in your exhaust pipe. it's condensation from heating and cooling of the pipe. maybe you've seen a bit of water spurt from the tailpipe of a car in front of you when taking off at a traffic signal? those black dots are likely where water spews from your tailpipe with just a wee bit of carbon build up attached. nothing to worry about. you may have your exhaust gas recycler (egr) valve check for inner build up. that's normal too..
if you take mostly short trips there'll be more water build up in your exhaust than longer commutes.
i drive a 2010 ranger for work 30 miles each way to work, and there's usually me water drops coming from the tailpipe everyday.
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Old 12-12-2012, 12:10 AM
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Re: Black spots on rear bumper...exhaust?

as said above, it is a mixture of running rich, our cars typically burn oil at higher rpms, so that could be part of it, mixed with the carbon build up and the moisture in the exhaust especially when the air starts to get colder it will condense on the inside of the exhaust as it cools down

edit: pressure washer should take it right off. its very hard for me to keep my lude clean. when it was warmer i washed it like 2-3 times a week lol
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Old 12-12-2012, 12:39 AM
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Re: Black spots on rear bumper...exhaust?

if your burning oil this can happen also but usually can swipe the inside of your muffler with your finger and tell if theres oil residual on it. if its black and chalky your running rich, if its black and oily it could be a combo of both running rich and oil man. (thats always a worst case scenario) but as to anything just laying the options on the table
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Old 12-12-2012, 06:55 AM
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Re: Black spots on rear bumper...exhaust?

both are typical for your motor.

shouldn't fail emissions because the black dots you see
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Old 12-12-2012, 04:35 PM
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Re: Black spots on rear bumper...exhaust?

listen to bykfixer.. i got an apexi n1 and they sit out the back at an angle and everyday i look at my car to see if some idiot hit me in the parking lot and notice a puddle of black water in the tip. could soak it up with paper towels if you really want but that wont help anything totally "normal"
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Old 12-16-2012, 03:14 PM
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Re: Black spots on rear bumper...exhaust?

Thanks for all the posts guys. I took a rag and rubbed the inner part of the exhaust and it just came off as black-like dust. So I guess I'm ok there.

The weird thing is when I bought the car this summer it never did this. Perhaps it's the cold weather or something.
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Old 12-16-2012, 10:30 PM
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Re: Black spots on rear bumper...exhaust?

Your probably running better gas than the other person . Injector cleaner will cause a little of that too I wouldn't worry unless you can actually see it out your mirrors haha
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