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Thread: Blowing black smoke..????
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07-26-2013, 05:39 PM #1
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Blowing black smoke..????
Hey guys I was messing around with my cousin yesterday on the street and he said that my car was blowing black smoke out of the tail pipe.. My car has full bolt ons stock heads stock intake with a hotcam and it's dyno tuned.. Do you guys think its just running rich or something else could be wrong..??
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07-26-2013, 05:59 PM #2
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rich. thats about it
aint nuthin but a 1995 slowmaro.... that thumps a lil bit
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07-27-2013, 01:16 AM #3
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How much smoke....
Blue is oil..
White is water...
Black is fuel or carbon....
If only under wot... No biggie.
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07-27-2013, 01:24 AM #4
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Id have to disaggree with your last comment. If your blowing black smoke then id run a fuel pressure test just to make sure your fuel pressure regulator is doing what's it supposed to be doing.......regulating how much fuel your car is getting. Just what id do.
Originally Posted by popo8
Fern_
94 Z28
A4, 3400 stall, B&M shiftkit, Richmond American 373 gears, CAI, shorty headers, Flowmaster catback, PCMforless tune.
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07-27-2013, 01:49 AM #5
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Ithe last part was supposed to be in conjunction with the "right answer" to the first question...prob shouldve waites for an answer before the last line.... Kinda burnt out ...lol Originally Posted by LT1RUNNER
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07-27-2013, 02:58 AM #6
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Just asked him about it again about how much smoke it was he looked and laughed and said I lied it was a very little bit io white smoke and its been rainng here for like 3 days what a asshole guy my cousin is lol. Thanks everyone for telling me ill do a fuel pressure check just to be doing it
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07-27-2013, 08:19 AM #7
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FPS does not regulate fuel at WOT. It runs by vacuum therefore since there's no vacuum at WOT the FPR is wide open. Depending on how much black smoke it's usually perfectly normal. If it's cause for concern then go back to your turner and have him look at the O2's on the dyno.
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07-27-2013, 08:42 AM #8
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With no vacuum the FPR should hold the rail pressure at 43.5psi (assuming it's a stocker, or an AFPR that you set to that pressure). It's there to regulate the differential pressure across the injectors (rail pressure minus manifold gauge pressure).
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