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Thread: Possible vacuum leak?

  1. #1
    Platinum Member livelyjay is someone we respect
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    Possible vacuum leak?

    I've got some drivability issues with my EXA, so maybe you guys can help me out.

    Vehicle:1987 Nissan Pulsar SE, CA16DE, 135000 miles, with CA18DE 5 speed transmission

    Problems:
    1) Start the car in the morning
    - Starts fine
    - Sometimes it Idles rough and bounces between 500 and 800 rpms
    2) Pull out of my driveway
    - Sometimes the car wants to die just pulling out of the driveway
    - Car has like zero power at low RPMs
    - Car acts like it wants to die at low RPMs
    - Shifting from 1st into 2nd, no power unless high RPMs
    3) Drive for a bit on the hwy and car warms up
    - Higher RPMs the car feels fine, not sluggish, has some pep
    - Get off hwy and the idle is rough and car wants to die

    I tested the vacuum at it reads -17 on the gauge, and wavers a little bit. I hooked it up to my 2003 Mazdaspeed Protege and it reads -22 solid at idle and -19 solid when AC is on. Any thoughts?
    1987 Nissan Pulsar CA18DET
    2003 Mazdaspeed Protege
    2007 Toyota Matrix XR
    Previous Dyno Runs

  2. #2
    HAve you tried the aerosol starting fluid trick?
    1988 Nissan Pulsar NX SE Sportbak
    If Nissan Motorsports is Nismo.. Wouldn't Honda Motorsports be Homo??

  3. #3
    Platinum Member livelyjay is someone we respect
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    No, I haven't tried that yet. I figured carb cleaner would work, but maybe I am wrong. I did some additional reading on vacuum readings and I think my mechanical timing might be off. This article was pretty helpful: http://www.secondchancegarage.com/public/186.cfm My gauge is reading about the same as scenario 3, but only at 17" instead of 15" as shown. I think my mechanical timing might be off by a tooth. I have to get the car in the air to replace the gear position switch, so I might as well check the timing too. I thought it was spot on when I put the belt on last year, but maybe not. Doesn't hurt to check it.
    1987 Nissan Pulsar CA18DET
    2003 Mazdaspeed Protege
    2007 Toyota Matrix XR
    Previous Dyno Runs

  4. #4
    \\\\__GP-EXA__//// exacyzm has a brilliant future exacyzm has a brilliant future exacyzm has a brilliant future exacyzm's Avatar
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    Yes you possibly have a vac leak. Check your timing though. Those kind of symptoms can be caused by dirty injectors too.
    Used to own: 1989 GP #086 (2001 - 2010)


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