Question about 1993 Chevrolet S-10 Blazer

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1993 s10 blazer has hesitation

I have a 93 s10 blazer. has a 4.3 vtec.When i start it up it seems to run fine, and it warms up (about 150 degrees) it starts to miss and act up. If i drive it, it hesitaes and sputters. if i hold it to the floor it will take off. But just for second. After it gets to operating temp, the engine light comes on and it runs like it should. I heard a vaccuum leak and sprayed carb cleaner. It idled up.... thus a vaccuum leak. I looked at the egr valve and one of the screws was backed off about 1/4 inch. i tightened it down and took her around the block. Ran like it should. thought that fixed the prob. the next day it was doing it again. PLEASE HELP
email yeunroach@yahoo.com

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  • Anonymous Jan 16, 2009

    I have the same problem. Its hard to start, then once going misses and hesitates. Slowly gets worse for about 20 mins until it until it dies. New wires, fuel pump, filters, ignition module. Each fix from the mechanic does nothing. It gets it running but then fails again. Mechanic is reluctant to check CRG valve (tough job?) as he says that would make it run rough but not die and quit.

  • Anonymous Feb 13, 2009

    I once had the same problem, after doing almost everything up there, replacing sparkplugs, plug wires, checking fuel pump, replacing sensors and such. It would seam to get better then get worse. The problem was in the distributer cap. $20 bucks at schucks and it hasn't done it since.

  • brian c
    brian c May 11, 2010

    The 4.3's as well as the 5.0, 5.7, and 7.4 liters that used the TBI (throttle body injection) are well known for the throttle body passages getting plugged up.

    Simply go to your local shop and pick up a throttle body gasket and a PCV valve.

    Disconnect all of the fuel and vacuum lines, and remove the throttle body from the intake manifold, flip it over (yes some gas will trickle out) and you'll see all of the neat little air passages clogged with carbon.

    You can use either an aerosol gum cutter or find a bucket/ pan that you can lay the throttle body flat in, and put about 1/2 - 3/4 of an inch of kerosene in the bottom (just enough to cover the lower mounting flange with the clogged passages (do NOT submerge the entire throttle body!). This is where a nice stiff parts cleaning brush comes in handy. You can either let it soak and think about life for a while, or brush it out of the passages.

    The aerosol gum cutter is definitely faster, but that stuff is really hell on your hands (and eyes).

    Once the passages are all clean and sparkley, dry / blow out the throttle body with compressed air to remove any chunks left behind (believe me, you don't want that stuff getting pulled into your engine). Wear safety goggles for this part.

    Remount the throttle body, reattach the vac and fuel lines. This is a good time to replace the PCV valve that's probably clogged / sticking.

    If this problem happens on the MPI (multi port) version, then it can be whole other host of problems, but usually the injector "octopus" is failing, and will eventually leave you stranded.

    An easy way to tell which one you have it look at the air cleaner. If you have the big round one in the middle of the engine (like the cars from the 70's - 80's, it's a TBI. If you have the aluminim intake runners and a square air filter mounted somewhere else besides right in the center of the engine, than it's a MPI.




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Hi everyone,

I had a very similar problem with my 93 S-10 Blazer. I thought it was just cold blooded. I'd start it and it would idle so rough and spit and sputter and it seemed as though the fuel was dumping right out the tail pipe! I placed the computer on it as my engine light finally came on but all it said was that the exhaust was rich. Well I know that! Thanks computer. So then I heard about a product called "Seafoam." It will clean the engine of carbon build up. There are three ways to use it, let the PCV valve **** it up, add it to the oil, or add it to the fuel tank.
I pulled the PCV valve out of the valve cover, removed the valve from its stem. turned the engine on then I reved the engine a bit from the throttle body while I placed the PCV stem inside the can of seafoam. While the can is being emptied you will see and SMELL a huge white cloud of smokey fog coming from the tailpipe. As soon as the can is empty let go of the throttle. If the engine does not stall on its own shut it off. Let it sit for 4 or 5 hours. Then start the engine.....it may start a bit hard....and PRESTO!!! I was skeptical of this product as there are so many out there that claim to be the best but this one actually works!! My truck now runs and idles like never before. It even increased my gas mileage considerably. I'm going to wait another week then add another can to my full tank of gas so it will do a job on cleaning my injectors. This can of seafoam cost me only $11.00 dollars Canadian. Thanks Seafoam!!

Posted on Jan 18, 2009

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