Question about 1994 Chevrolet S-10 Blazer

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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

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  • JBlazer Mar 11, 2009

    I do believe I have a rich air to gas ratio, because the cab and area up to a radius of about 6 feet around the truck is innundated with the stench of raw gas... I have no clue what that's about. I replaced the fuel filter recently maybe that's it? 


    Also, the switches are no longer connected to the contacts, they are just kind of loosely in there making contact with nothing other than the door panel that keeps them in the door. If i take the door panel off, they fall out. This has also happened to the window switch in the back seat.


    And what are vacuum leaks? Not mechanically savvy, but I do kinda know my way around my truck.

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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

Posted on Mar 10, 2009

  • zazzarettid Mar 11, 2009

    when yor pistons are on thier in take stroke they pull in air creating a vacuum. you have vacuum hoses in various places on the engine. You can listen for them when you are under the hood and accelerate the engine. leaks dont always come from hoses, they can come from any where parts are added to the engine block or head. you can buy a vacuum tester fairly cheap in the autoparts store. you just hook the hose to a vacuum port ( usaually theres a diagram under the hood or above the radiator. with the tester hooked up start the truck and you should have a steady vacuum between 18 and 22 hg. vacuum leaks sound like a hissing sound. you just got to kind of track it down.

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