94 Chevy S-10 Blazer blowing black smoke from tailpipe!
My 94 S-10 Tahoe Blazer blows black smoke from the tailpipe when the RPM's get high. Not sure how many RPM's at which it happens, I don't have a tach. Also, the driver's side window won't roll up all the way, the truck shakes when idling (even after tune-up), ALL of the toggles for power locks are still in the door, but it seems they've broken off, and none of the power locks work, brake lights on left side doesn't work (despite the many attempts at fixing it, and new bulbs) although the tail lights (when headlights are on) work. And the backl hatch doesn't open (glass included)
I promise I take care of my truck, but Nevada repair shops are EXPENSIVE! I try to fix everything by myself, but I have a limited knowledge (very limited) of mechanics. Anything helps! Thanks
Re: 94 Chevy S-10 Blazer blowing black smoke from...
As far as the black smoke you have rich air/fuel ratio. check you air filter and for vacuum leaks. as for the windows i had one just like it with the same problem. get some circut board cleaner and take the switch in the door out and saturate the little circut board and contacts. thats all i had too do to mine. hope this is help to you
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www.tahoeforum.com > ... > Technical Discussions Dec 5, 2008 - 10 posts - 7 authors
2001 Tahoe, the front heater blows a little hot air when the car warms up and then blows cold air. The rear heat seems to work fine. I changed ...
If you are sure you have a spark to at least half of the plugs, and there is no reason to suspect that the engine was being used abnormally just before it was shut down then it is most likely flooded or you ran out of gas.
Black smoke from the tailpipe indicates that the engine is getting a fuel mixture abnormally high in fuel (flooding). White smoke generally indicates not enough fuel.
Unless your engine is damaged or the timing changed, your engine will run if it has the following: proper fuel mixture, air, a spark to at least half of the spark plugs, and compression.
For a "flooded" engine there are two routes. Wait until the excess fuel has had time to dissipate or hold the accelerator to the floor while attempting to start. Be prepared to let off the accelerator about halfway as soon as it starts. And then down to about 1500 rpm. You do not want to over rev the engine. But holding it at about 1500 rpms for about 3-5 seconds will help flush out any excess fuel. You can then slowly return it to idle speed.
Only two reasons for this first is its below 0 outside the next is blown head gasket. Now thats WHITE smoke.ONLY.If it smells sweet like anti freeze that confirms head problem. black smoke is fuel, blue smoke is oil. sorry hope this helps TIM
A puff of smoke when you start up indicates worn valve seals.That's why all your work didn't fix the problem and it doesn't show a code. It's a pain in the --- job that requires some specialized tools so I guess it depends on how bad it bugs you,if oyu want to fix it.
Does it blow black smoke when it's hot? if so, Replace the cold start sensor. If not check to make sure your cats aren't plugged, (they will get red hot). If they are plugged the engine will loose power and stall.
If your intake gaskets are leaking, when you dump soapy water on the gasket, it should bubble like crazy ( when it's running). If you can, run it with the rad cap off and watch for bubbles. If it keeps bubbling, you probably have a head gasket problem.