Question about 1994 Chevrolet K1500

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Low Vacuum For the last 25,000 miles (currently at 192,000), my engine has had a miss. I replaced the spark plugs, spark plugs wires, distributor cap, and rotor. I also replaced the EGR valve, ignition coil, and fuel filter. There is still a miss. It is most noticeable when the engine is cold. I drive a 1994 Chevy K1500 4.3L V6, AT. I did a vacuum test and the dial read 15 inches Hg. I don't know what Chevy says it should be, but that sounds low. My question is, is that low? If so, what are common problems?

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  • nathan_mitch Jan 30, 2009

    Hey Jerry, I did a compression test. The ranges were 150-165 (non-running compression test). GM has a rule about 10% difference between highest and lowest numbers and so my cylinders are in that range. They could all be low collectively, but I don't think that's my problem.

  • nathan_mitch Feb 11, 2009

    I actually found the problem. All that work and there was a split vacuum valve behind where the EGR valve hooks up... Oh well. Thanks for your help

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  • Chevrolet Master
  • 443 Answers

You might try having someone run a compression test on it it or something you can do easily . might be valves are leaking by some and you might be loosing compression. with that amount of miles very possable its getting there. thanks Jerry ..holler if you need more.

Posted on Jan 30, 2009

  • Jerry Koski
    Jerry Koski Jan 31, 2009

    94 is still throttle body injected .. its about the only thing you havnt checked right ? you might have to replace that injector and see if that is what the problem is .First check the wires that attach to it by looking down into it and making sure all connections are fine to the injector ... you have changed everything else that it could possably be am I right ? also you might just use a temperature gun to make sure you are getting same temp from each exhaust port to see if they are all evenly firing .. this tells me alot when i use mine .. It might tell you if you installed a faulty plug or cracked plug or bad wire.. just a few more thoughts .. you are getting there .. I bet you hope this ends soon ..

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3 Suggested Answers

cansmo
  • 2429 Answers

SOURCE: i have a 1988 k1500

Are you a TBI?(throttle body injector) if you are take the top of the air cleaner out step on the gas pedal(do this in park hood open fire extinguisher on the ready.) does it backfire through the air cleaner if it does you are in need of a whole distributor unit the distributor unit has a relector that has a high tendency for failure by the way the vehicle sound there is only 2 possible problems you coil is faulty and this includes the connection to the coil which has a tendency to seperateor the connection to the ICM.(ignition control module where the coil is) or the whole distributor reluctor

Posted on Aug 01, 2011

  • 422 Answers

SOURCE: 1998 chevrolet k1500 pickup 305 a misfire in # 2 cylinder

hi there, if you can feel the misfire at an idle but not at a higher rpm than the fuel pressure regulator is bad im working on one right now that has mifire code and random misfire codes coming up

Posted on Aug 28, 2008

tech1969
  • 438 Answers

SOURCE: i am trying to remove a distributor rotor on a

pull up on other side nt to hard but put pressure on it then try unscrewing the stripped screw

Posted on Dec 24, 2010

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