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Getting black specs on my bumper

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Old Sep 25, 2011 | 01:40 AM
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Default Getting black specs on my bumper

have no idea where to put this,
Car is 2002,M6, LS1, H/C/I with catted-y. Car runs great, no codes.
I have noticed since the parts have been installed on my car,
after a couple days after washing. The inner parts of my exhaust tips are very dirty (black, sooty, which I assumed was normal) But I am getting little black specs of soot like material all over my bumper.
When I wipe it with my finger it smears, and sometimes very hard to wash off.
Is this normal?
Plus my car is white, so it is easy to see.
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Old Sep 25, 2011 | 06:44 AM
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If it has not used any oil after the parts install and no leaks, must be soot.

If it has used oil, you might have to install a catch can.
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Old Sep 25, 2011 | 01:44 PM
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A cold engine is going to run a little rich on that first start up, plus the cats are also cold and they need to be hot to do there job.
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Old Sep 25, 2011 | 02:25 PM
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Have you had your PCM Tuned to account for the new parts?

If not, my guess is you're running rich.

I would definitely look into an Aftermarket Tune. At least a Mail-Order-Tune, unless you have a Shop with a Dyno nearby and can afford running your ride on the rollers.

If you already have a Tune on the car, I'm with 99Bluz28. You should invest in a bottle of Detail Spray and some Microfiber Rags so you can wipe down the bumper when you get to your destination.
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Old Sep 25, 2011 | 03:40 PM
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car has been street tuned and dyno tuned.
and I am running a catch can.
A/F ratio is 14.5 at idle and when driving, on decel it goes to 12.5 but comes back up when gas pedal is depressed or coming to a stop.
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Old Sep 25, 2011 | 09:52 PM
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What size cam do you have?
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Old Sep 26, 2011 | 12:41 PM
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it's 231/230 111lsa
I will have to check the cam card for the lift.
I think it was like 630 on intake and a little less on the exhaust.
It doesn't bother me that much. I just want to make sure it is ok.
I just assumed it was a byproduct of running H/C/I
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Old Sep 26, 2011 | 01:36 PM
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How long ago did you install these parts on your car, and did this just now start happening?
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Old Sep 26, 2011 | 01:48 PM
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The intake/exhaust valve overlap of 8.5* is a contributing factor, Check you spark plugs if they look good don't worry about it.
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Old Sep 26, 2011 | 03:02 PM
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Parts were installed about 7 months ago, and has done it from the get go.
The car uses about a quart 1/2 of oil every 3000 miles or so.
I checked the plugs last week, everything looked normal.
thanks for the help guys
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Old Sep 28, 2011 | 07:07 PM
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definitly do M mownts @ the same time I had all kinds of radilds untill i did mine afterwerds & you mite want to go with a 2.5" Y pipe if your lowerd my 3" hits evry thing :/ hears a link to a pic of my hookers & 3" TPS catted Y Pipe instaled. Post #11

https://ls1tech.com/forums/generatio...ed-y-pipe.html
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Old Sep 29, 2011 | 07:32 AM
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I have the same crap on mine. But I don't have cats. That's the last part I wash on the car because it destroys the wash rag. Like Blue said, even with cats that cam pukes a lot more crap through the exhaust than stock.
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