PDA

View Full Version : black snow



819_ay
02-10-2012, 09:43 PM
so here is the thing, i park my car in a garage in the winter, and well when i start it up i open the garage door a bit so it doesnt fill up with smoke and well the snow has turned black from the exhaust smoke and well the garage door also has a black circle..what could be causing i'm guessing it's oil or just dirt from the engine to be coming out the back like that...

T-spoon
02-11-2012, 01:41 AM
You're most likely running quite rich, and that's fuel.

819_ay
02-11-2012, 02:28 AM
what could be causing the car to run too rich...it's st185, stock pretty much with a fmic...i'll check into getting an a/f gauge...

T-spoon
02-12-2012, 09:59 AM
They run pretty rich in general, but lots of things could cause it to be more than usual. O2 sensor, exhaust leak before the O2, for instance.

819_ay
02-12-2012, 10:24 PM
well how about no o2 sensors...i dont have any in the exhaust...well i have on but the wires have been cut...would that be part of the probleme??

T-spoon
02-13-2012, 12:44 AM
That could certainly contribute. With improper or no O2 signal the factory ECU is probably going to dump a stupid amount of fuel to keep things "safe"

819_ay
02-14-2012, 02:58 AM
well it's not a factory ecu...it's a mines ecu... that could maybe explain why she goes through 14 L/100km....how do i reconnect the o2 sensor...should there be on or two??
i have a berk DP with a straight 3" exhaust...

T-spoon
02-14-2012, 04:11 AM
One O2 in the elbow of the downpipe just after the turbo. I'm assuming this is an st185, so the female side of the O2 connection should be mounted on a bracket on the alternator or dangling in that area if I recall correctly. If your connector from the O2 sensor is cut off, you'll need to find one and wire it into the cut wires and plug it in (unless they cut the female side off too, which I can't imagine what reasoning there'd be for). There's no guarantee the O2 sensor isn't damaged either, so you may end up needing to replace it, which would certainly solve the issue of finding a replacement connector.

819_ay
02-14-2012, 05:30 PM
well ill just buy a new o2 sensor it but be easier...thx dude appreciate the help

T-spoon
02-14-2012, 08:20 PM
NP, hope that's all it was!

819_ay
02-14-2012, 08:58 PM
so i ordered an new o2 sensor i just be getting it later today...but the female connector is half way melted, i'm gonna try and use it anyways and see what happens...how do i know if it's working properly??

T-spoon
02-14-2012, 09:02 PM
Ideally you'll get a better idle (and closed loop running in general), have less visible exhaust (and related blackening of your surroundings), but also check for codes. If you get no O2 sensor code then that indicates it's working. This is on a properly set up car anyway. I don't know what modifications have been done and whether there was tampering with your diagnostics port/wiring/ecu etc.

819_ay
02-14-2012, 09:20 PM
well i can tell you that even without the o2 sensor i dont have any codes...but as soon as i put the stock ecu well i get a couple of codes, when i put the mines back in well they go away...so i guess we will see....thx again dude....

819_ay
02-21-2012, 02:04 AM
i found a new connector...it's a four pin connector the same as on the o2 sensor, so i pluged it in, but nothing has changed...is it possible that the mines ecu just cancels them out??

T-spoon
02-21-2012, 03:41 AM
Honestly I don't know how the mines ecu is set up. It seems odd that it wouldn't use the O2 at all, but I suppose it might do something funny like never be in closed loop really. Hard to know without a wideband O2 gauge. You could always put the factory ECU on and see if it throws the O2 code and see if it idles leaner.

819_ay
02-21-2012, 06:02 PM
yeah i could try that i have a couple of em ...i'll see what i can do thx again...but for the black stuff coming out the exhaust it only happens for the first 5 minutes after i start up the car, and after that it stops...and only after it's been sitting there for a few hours or over night...