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Need to replace vacuum hose to brake booster.Cannot get fitting out of intake plenum

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Posted on Jan 02, 2017

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SOURCE: mazda 626 gf 1.8l vacuum hose

I am not a pro but I know engines in general I grew up in my dad's mechanical repair shop..

A vacuum gauge is usually connected in between the Air filter and the engine intake manifold. The best place to fit one would be on the Vacuum advance and ****** that is found on the Distributor. It is a rather thin pipe thinner than a pen but I think that is the size required and it does **** on the distributor all the time.

It is usually a round little silver UFO look alike thingy with a pipe coming out of it going to the carburetor or injection system somewhere. I would cut that pipe and put a T piece in to connect to my Vacuum gauge or in your case, cruise control. (Aquarian pet shops sell the right size.)

Be sure to buy a few strait fittings with the T piece so you can repair or mend any cutting you did if you made a mistake.

To prevent a vacuum gauge from jumping around and rather give a smooth reading we often put a little thick oil in the pipe to ad as a buffer between extremes but it can also ****** your responses too much on the other end so its a little of a trial and error situation to determine exactly how little oil to use.

Posted on Aug 13, 2012

Testimonial: "thanks for the tip of the strait fitting and a t-piece in case of repair."


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2004 Nissan frontier. Bypass hose replaced by a mechanic that had to remove the intake plenum. Now the check engine light is on. EGR is not getting vacuum. Brake booster looses vacuum when off.

It sounds like a vacuum leak either at the intake plenum or intake manifold, or egr valve.You might check all the vacuum lines to be sure they are all connected. But if it was not doing that before the mechanic worked on it I would take it back to him and say fix it. The check engine light is on because there is a vacuum leak and it's causing the egr valve and booster to not function properly.

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What you are doing is chocking the system and there is only 2 possible reasons why you can do this 1st you may have a large vacuum leak like the PCV hose or disconnected brake booster hose or intake manifold gasket,the other possible is the EGR is stuck open or a failed MAP sensor

Sep 13, 2011 | 1997 Chevrolet S-10 Pickup

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How to remove intake manifold on 2005 Buick Lesabre

You didn't post the size of your engine so please pick the appropriate one:

  1. Relieve the fuel system pressure.
  2. Drain the cooling system.
    1. Remove or disconnect the following:
    2. Negative battery cable
    • Supercharger
    • Thermostat housing
    • Exhaust Gas Recirculation (EGR) tube at the intake manifold
    • Engine Control Temperature (ECT) sensor
    • Intake manifold
  • To install:

    1. Install or connect the following:
      • Intake manifold with new gaskets. Torque the bolts, working from the center out, to 11 ft. lbs. (15 Nm).
      • ECT sensor connector
      • EGR tube to the intake manifold
      • Thermostat housing
      • Supercharger
      • Negative battery cable
    2. Refill and bleed the cooling system.
    3. Run the engine and check for leaks and proper engine operation.
    4.6L Engine
    1. Remove the brake booster hose from the throttle body.
    2. Remove the fuel pressure regulator vacuum tube from the fuel pressure regulator and the water crossover.
    3. Remove the PCV fresh air feed tube from the camshaft cover and the throttle body.
    4. Remove the PCV dirty air tube from the PCV orifice in the right camshaft cover and from the intake manifold.
    5. Disconnect the fuel injector electrical connectors from the fuel injectors.
    6. Remove the fuel injector wiring harness.
    7. Remove the fuel rail bracket nut from the engine lift bracket.
    8. Remove the fuel rail studs.
    9. Lift and remove the fuel rail with injectors.
    10. Loosen the plenum duct clamp in order to remove the intake manifold.
    11. Remove the intake manifold bolts.
    12. Remove the intake manifold.

    To install:

    1. Install the intake manifold, fitting the plenum duct over the intake manifold duct.
    2. Loosely install the intake manifold bolts.

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    Intake manifold torque sequence-4.6L engine

    1. Tighten the intake manifold bolts in sequence. Tighten the intake manifold bolts to 89 inch lbs. (10 Nm).
    2. Tighten the plenum duct clamp to the intake manifold. Tighten the plenum duct clamp to 24 inch lbs. (2.75 Nm).
    3. Inspect the fuel injector O-rings. Ensure the fuel injector O-rings are not missing, misaligned or damaged. Replace the O-rings if necessary.
    4. Lubricate the intake manifold fuel injector bores with light mineral oil (GM P/N 9981704), clean engine oil, or equivalent.
    5. Install the fuel rail with fuel injectors as an assembly.
    6. Install the fuel rail studs. Tighten the fuel rail studs to 80 inch lbs. (9 Nm).
    7. Install the fuel rail bracket nut to the engine lift bracket. Tighten the fuel rail bracket nut to 89 inch lbs. (10 Nm).
    8. Install the fuel injector wiring harness.
    9. Connect the fuel injector electrical connectors to the fuel injectors.
    10. Install the PCV dirty air tube to the PCV orifice in the right camshaft cover and to the intake manifold.
    11. Install the PCV fresh air feed tube to the camshaft cover and the water crossover.
    12. Install the fuel pressure regulator vacuum tube to the fuel pressure regulator and the throttle body.
    13. Install the brake booster hose to the throttle body.

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    Where would i install a vacuum gauge on a 1994 3.4l v6? The fitting at the back of the motor is about impossible to get your hand in between the plenum and intake.


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    No vaccum on brake booster inlet

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    The sable brakes well first application then if applied soon after have no assist

    check the large vacuum hose on the vacuum booster,unplug it from booster and make sure it is getting alot of vacuum from the engine intake,if you have a blockage in the hose that will give you this problem,if it is ok,reconnect hose and start car,listen closely as you push down on the brake pedal,to see if you can hear vacuum leaking from under dash,if you do the diaphram in the booster is cracked and you will need to replace the booster.and even if you don't hear vacuum inside you will need to replace it

    Dec 10, 2009 | 1995 Mercury Sable

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