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#1 |
Registered User
Join Date: Oct 2002
Location: Chanhassen, MN
Posts: 1,061
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Hey all,
For the last 3 weeks my truck has been blowing black smoke when I start it. It's just when I start it and not while idling or driving. I adjusted the carb over the weekend and I know I have it adjusted correctly. It was running a little rich before. I just changed the plugs today to have a somewhat fresh start with the newly adjusted carb. It doesn't matter how warm the engine is, in fact, when it's cold, I don't notice any black smoke. But it doesn't happen ALL the time. Maybe 80% of the times I start it when it's warm. Also when it does have black smoke, it's really stinky. It doesn't smell rich. It smells like something else is going on. The smell is kind of hard to explain. I guess the closest I can come is it smells like old burning grease. Not quite as bad as hot differential fluid but kind of similar...I think?? Another thing that might be worth noting is I have oil that comes out of the filler hole. I've replaced the PCV valve and checked the new one to make sure it was good and checked the breather hose for obstructions but all is clear. Overall, it drives really good and has been very reliable lately. I just want to catch this problem before it gets worse and leaves me stranded someday.... Any clues?
__________________
ChevyChic 86 Chevy K-10 If I can't be a good example, then I'll just have to be a horrible warning. "You're braver than you believe, and stronger than you seem, and smarter than you think" - Christopher Robin |
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#2 |
Senior Member
Join Date: Mar 2003
Posts: 2,500
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Too me,
That is your choke coming on. You know............making the mixture rich (or too rich?) You might try to back off the choke a little and see if it helps. If it is running a little rich; that's better than running lean. |
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#3 |
Hoarding Rusty Objects
Join Date: Aug 2002
Location: Slatington, PA
Posts: 267
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Yeah, but running very rich can be very bad. Thats why I have to rebuild my Chevelle engine. I took the pistons out yesterday, or rather they fell out, since the cylinder walls were so washed with gas.
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1985 Chevrolet K20 Silverado 1994 GMC Yukon Follow me on Youtube! - http://www.youtube.com/user/FuelInjectionSucks |
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#4 |
Registered User
Join Date: Oct 2002
Location: Edmond, OK
Posts: 5,906
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ok, heather and myself discussed this last night.. whats with the oil coming out of the breather and pcv? i am having the same problem. and have replaced the pcv..... breather clogged maybe?
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Jon 1982 Chevy Silverado 350/th350.... RETIRED 1993 Jeep XJ 2 door(Cherokee) 4wd 4.0ltr/AX-15 (5spd)/NP231 .... Oklahoma Roll Call |
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#5 |
You get what you pay for
![]() Join Date: Dec 1999
Location: Cherryville, NC
Posts: 4,798
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The oil coming out of the breather is a sign of worn rings most of the time. It's called blow by. Does it blow oil out or just build up over a period of time? Does it smoke out of the valve cover breather?
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Mike 1985 Chevy C-10 |
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#6 |
Registered User
Join Date: Oct 2002
Location: Edmond, OK
Posts: 5,906
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as far as mine, it appears to blow oil as it covers everything on both sides.. and yes it comes out the breather...
__________________
Jon 1982 Chevy Silverado 350/th350.... RETIRED 1993 Jeep XJ 2 door(Cherokee) 4wd 4.0ltr/AX-15 (5spd)/NP231 .... Oklahoma Roll Call |
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#7 |
Registered User
Join Date: Oct 2002
Location: Chanhassen, MN
Posts: 1,061
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mine blows oil too. Mainly on the side with the filler hole. I can't keep anything on that side of my engine compartment clean because of it.
I have a bit of seepage out of the breather hole that appears to be build up, but its blowing out of the filler hole.
__________________
ChevyChic 86 Chevy K-10 If I can't be a good example, then I'll just have to be a horrible warning. "You're braver than you believe, and stronger than you seem, and smarter than you think" - Christopher Robin |
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#8 |
Account Suspended
Join Date: Oct 2002
Location: Elkhart, IN
Posts: 6,400
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if you've literally got oil blowing out of the valve cover openings, to the point of oil all over everything on that side of the engine, it may be time to start saving for a new engine, or rebuild the one you have. do any of your mechanic buddies have an air compressor that you have access to? if so, get ahold of a leakdown tester, and run a leakdown test. that will tell you the quality of the ring seal. my guess is, its not healthy. it still may be healthy enough to run, and get you where you need to go reliably, just make sure to keep an eye on your oil level.
oh yeah, if you do decide to do any major work to the engine, please take lots of pics. there's nothing sexier than a woman grease covered and elbow deep in an engine. ![]() |
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