black smoke!!!!
09-15-2007, 12:02 AM
#1
3rd Gear Member
Thread Starter
Join Date: Dec 2005
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Posts: 606
black smoke!!!!
today i saw black smoke coming out of the tailpipes when its revved. it only comes out when i first turn on the car. about 30-45 seconds later there is no smoke coming out even while revving. whats wrong with it?
09-15-2007, 12:06 AM
#2
RE: black smoke!!!!
Well do you have that "rich gas smell"? If so, then it's burning rich upon start up, and is leveling out down the road. Could be a million things if it's this.
If there is no odd rich smell, then I'm thinking that it may be part of the EGR system that's going out.
If there is no odd rich smell, then I'm thinking that it may be part of the EGR system that's going out.
09-15-2007, 12:26 AM
#4
RE: black smoke!!!!
Well cats filter out the smell, so it being cloged doesn't make sense to me. It's one of many possible things, so to narrow the search down more, does the car idel normally, start normally, run throught out all RPM ranges normally. In other words, if "anything" at all isn't normal, then what's it doing. I'm willing to bet it's the EGR system, just did a little bit of reading up on the system, and how it functions, and it "can" cause a car to burn excessivly rich and therefor have black smoke, but the fact that it goes away is a little odd, I'm banking more on the EGR sensor, or the valve itself is faulty.
09-15-2007, 12:33 AM
#5
RE: black smoke!!!!
Second thought about the cats, is your "check engine light" on. If it isn't then the cats are fine, if it is, then they're probably cloged, but even being cloged I don't see hoe they'd make black smoke under normal circumstances that just "goes away".
09-15-2007, 12:52 AM
#6
The Rogue Mod
Join Date: Feb 2006
Location: Maryland Sucka's!!
Posts: 21,918
RE: black smoke!!!!
The egr system is not functional on a cold engine. It could be an injector/s leaking down, leaving extra fuel in the combustion chamber and being burned on start up. That would explain why after start up, it goes away. Could be a lot of things including an o2 sensor or a bad ect, but the egr not being one of them.
09-15-2007, 01:01 AM
#7
3rd Gear Member
Thread Starter
Join Date: Dec 2005
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RE: black smoke!!!!
well i just replaced the ect sensor so impretty sure it isnt that and it runs perfect throughout the rpm range. i havent noticed any changes in the way it runs. is this a major cause for concern?
09-15-2007, 01:04 AM
#9
RE: black smoke!!!!
ORIGINAL: PRO50SC
The egr system is not functional on a cold engine. It could be an injector/s leaking down, leaving extra fuel in the combustion chamber and being burned on start up. That would explain why after start up, it goes away. Could be a lot of things including an o2 sensor or a bad ect, but the egr not being one of them.
The egr system is not functional on a cold engine. It could be an injector/s leaking down, leaving extra fuel in the combustion chamber and being burned on start up. That would explain why after start up, it goes away. Could be a lot of things including an o2 sensor or a bad ect, but the egr not being one of them.
09-15-2007, 01:41 AM
#10
2nd Gear Member
Join Date: Jan 2007
Location: LOS ANGELES
Posts: 408
RE: black smoke!!!!
its definately running rich, cars usually run rich during cold starts to help warm it up, egr has nothing to do with it along with clogged cats, changing the ect sensor would help if it was faulty.If you have access to a scan tool check out your readings otherwise check your air filter, 02 sensors and possibly leaking injectors.