Question about 1985 Chevrolet Chevy

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Need vacuum diagram

350/5.7L Chevrolet 1985 K5 Blazer. Vacuum lines are all over the place not hooked up. Any help would be a life saver.

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  • Anonymous Mar 12, 2014

    I NEED TO SEE A VACUUM DIAGRAM THAT SHOWS WHERE THE VACUUM LINES ARE CONNECTED TO. EACH ONE I HAVE SEEN ONLY SHOWS THE COMPONENTS AND NOT HOW THEY CONNECT.

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  • Chevrolet Master
  • 2,002 Answers

I can't send you a diagram but I can tell you the basics that should get you mobile. Take a vacuum line from the lower front of your carb and hook it to your distributer vacuum advance. Take another from the front of your carb and run it to your EGR valve. It should be beside the carb on the intake manifold. At the rear of your carburator there is a large line coming out. It should be steel. It provides vacuum boost to your power brakes. Hook it up. Make sure all other vacuum outlets on the carb and intake are blocked off and you should be able to get mobile.

Posted on Jun 06, 2009

  • 2 more comments 
  • cy schousboe Jun 09, 2009

    I forgot earlier to find out if your truck was an automatic or standard. If it is an automatic there is another vacuum line to hook for the transmission. You should see a steel line coming up from under the firewall. Use a small piece of vacuum line to attach this to a vacuum port on the rear of the intake manifold. There should be one near the center. The other end attaches at the rear of the transmission with a small piece of vacuum line as well. This is the modulator valve and needs to be hooked up for shifting. If it's missing, hook it up.

  • g2xs Sep 25, 2010

    in 1985 TBI or Carburetor trucks had no Vacuum advance, they are all computer controlled timing.
    Also, only the Turbo 350 transmissions had the Vacuum, and since its a K5, has a 700R4.

    hippycy, please, if you are going to give out any information, do your homework first, giving out totally wrong information is not only bad for the guy receiving your information, it makes you look stupid.

    hippycy, there should be a vacuum diagram under your hood, on your emissions decal, it is normally located on the air cleaner or radiator support. If thats not there, you will have to visit a library or pay for your local shop to hook you up with one.

    Sorry, if you get this wrong, you can not only fail emissions, you can cause horrible gas mileage. The only thing I can tel you is to hook manifold vacuum to your MAP sensor.

    Hope I helped.

  • cy schousboe Sep 26, 2010

    If you read the first line I clearly stated that this was basics that should get the engine running. I didn't claim that it was correct as per manufacturer's specs. Since the writer gave it a thumbs up I guess it helped, didn't it.
    I don't know what it's like where you are but where I come from the odds of a 20 year old truck still having all the factory original stuff are slim to none.

  • marine1345
    marine1345 Jan 20, 2013

    My 85 K5 Blazer has vaccuum advance and no ecm, no check engine light. The only vaccuum that needs to be hooked up is the bake canister and the VACCUUM ADVANCE. some late 85 california models have O2 sensors and check engine light but not all. so in saying this you owe the gentalman an apology for your rudeness and comments. im speaking to G2xs

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