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Black Tailpipe Soot
I've searched the archives prior to posting this.
The prob is my 94 Civic has black soot that emits from the tailpipe and gets all over the rear bumper and tailpipe. It shoots out some black water sometimes when cold. The motor is a bone stock 1.5l, only an intake. New parts within the last week are: Spark plugs Wires O2 sensor PCV Valve Cap and rotor The air filter is clean as well. I've tried putting back the stock intake to see if this would make a difference, but no diff. The car doesn't consume much oil for it's mileage (320k). Otherwise it runs and starts excellent, but this is annoying. Some older posts have suggested oil consumption or misfiring but I have none of those probs. I'll try checking fuel pressure this week (40psi right?) and when the tank runs empty I'll try some Ultra 94. Any other suggestions or has anyone had this problem before? Coolant temp sensor, maybe? Thanks |
catalytic converter
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Probably running rich.
Running rich causes black smoke out the tail.. (Unburnt fuel) |
yeah i have that problem as well....
what is running rich? |
Originally posted by j_limitz yeah i have that problem as well.... what is running rich? bad O2 sensor .. O2 sensor signal shorted stuckl injector bad ECU fuel pressure off the wall to high fuel filter???? fuel pump???? MAP sensor signals fubarred? lots of stuff can cause the ECU to dump more fuel.... engine running to hot will also cause it.... |
car is running rich, my car spits unburnt fuel out at idle, makes a nice puddle for me on the driveway everytime :(
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pull ur spark plugs out and observe the colour....
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Originally posted by QuiCK_TiME car is running rich, my car spits unburnt fuel out at idle, makes a nice puddle for me on the driveway everytime :( haha... man the puddle is water vapour from your exhaust, it's not raw fuel :) think about it... fuel evaporates even at room temp, right? now... think about how hot the engine gets... do you really think raw liquid fuel could make it all the way from your engine to the tailpipe w/o evaporating? |
Originally posted by bbarbulo try to light that puddle on fire :D haha... man the puddle is water vapour from your exhaust, it's not raw fuel :) think about it... fuel evaporates even at room temp, right? now... think about how hot the engine gets... do you really think raw liquid fuel could make it all the way from your engine to the tailpipe w/o evaporating? true that is :thumbup:, how come i leave big black stains/puddles every i go? perhaps i need SeaFoam and my car is super rich currently. |
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