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Thread: ZJ Vacuum Lines?

  1. #1
    Registered '97JGCLaredo's Avatar
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    Icon928 ZJ Vacuum Lines?

    Hi all, was wondering if anyone has the diagram that shows the vacuum lines. I think at one point it was on top of the radiator but somehow it was removed before I purchased the Jeep.
    Looking for the diagram to check for leaks cause my ZJ has this (slight) sporadic idle regardless if its in park or drive. If i'm at a light for instance and the light is about to turn green and I let go of the brake, it doesn't roll smoothly. It sort of has a push at times. When i'm doing 35mph, it runs fine. I hope I make some sort of sense so someone can help me out.

    Has new plugs, wires, cap & rotor. 107k. Cleaned the K&N filter. Has new fuel pump.

    Any help would be greatly appreciated.
    1997 Grand Cherokee Laredo Char-Gold
    106k Inline 6 w/ Bosch Platinum +2 Plugs
    K&N FIPK GEN2
    Clear Corners (Looks Sweet)
    Sylvania Silverstar Headlamps
    Reverse Glow Guages
    Viper Responder 791xv 2Way W/ Remote Start
    Pioneer AVIC N2 In Dash DVD/NAV Unit
    2 10" Infinity Reference 1030w Subs in Ported Box
    Infinity Kappa 63.5i 6-1/2 3Ways in Front
    Infinity Kappa 60.5cs 6-1/2 Components in Rear
    MB Quart DSC450 4 Channel Amp
    MTX 6500d Class D Amp

  2. #2
    Registered '97JGCLaredo's Avatar
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    Anyone?
    1997 Grand Cherokee Laredo Char-Gold
    106k Inline 6 w/ Bosch Platinum +2 Plugs
    K&N FIPK GEN2
    Clear Corners (Looks Sweet)
    Sylvania Silverstar Headlamps
    Reverse Glow Guages
    Viper Responder 791xv 2Way W/ Remote Start
    Pioneer AVIC N2 In Dash DVD/NAV Unit
    2 10" Infinity Reference 1030w Subs in Ported Box
    Infinity Kappa 63.5i 6-1/2 3Ways in Front
    Infinity Kappa 60.5cs 6-1/2 Components in Rear
    MB Quart DSC450 4 Channel Amp
    MTX 6500d Class D Amp

  3. #3
    Registered Doug-ie-Fresh's Avatar
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    I hope this is a good enough pic:

    https://w05.dealerconnect.chrysler.c...S/80b898e1.gif
    94 ZJ: Fully built and Very fast.

    98 ZJ Laredo 5.2: Fully built and very kush.

  4. #4
    Registered Doug-ie-Fresh's Avatar
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    Also check and clean the TPS.
    94 ZJ: Fully built and Very fast.

    98 ZJ Laredo 5.2: Fully built and very kush.

  5. #5
    Registered '97JGCLaredo's Avatar
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    Quote Originally Posted by Doug-ie-Fresh View Post
    Thanks for that pic but I was looking for a diagram showing the vacuum lines. Not fuel lines.
    Last edited by '97JGCLaredo; 10-08-2010 at 12:18 AM.
    1997 Grand Cherokee Laredo Char-Gold
    106k Inline 6 w/ Bosch Platinum +2 Plugs
    K&N FIPK GEN2
    Clear Corners (Looks Sweet)
    Sylvania Silverstar Headlamps
    Reverse Glow Guages
    Viper Responder 791xv 2Way W/ Remote Start
    Pioneer AVIC N2 In Dash DVD/NAV Unit
    2 10" Infinity Reference 1030w Subs in Ported Box
    Infinity Kappa 63.5i 6-1/2 3Ways in Front
    Infinity Kappa 60.5cs 6-1/2 Components in Rear
    MB Quart DSC450 4 Channel Amp
    MTX 6500d Class D Amp

  6. #6
    Registered '97JGCLaredo's Avatar
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    Quote Originally Posted by Doug-ie-Fresh View Post
    Also check and clean the TPS.
    Already checked the TPS and the IAC (both were replaced about 2 years ago). The thing is, this "problem" existed since I bought the ZJ (7 years ago). Now it just seems to have gotten worse or more noticeable and was looking to get it fixed without taking it to a repair shop.
    1997 Grand Cherokee Laredo Char-Gold
    106k Inline 6 w/ Bosch Platinum +2 Plugs
    K&N FIPK GEN2
    Clear Corners (Looks Sweet)
    Sylvania Silverstar Headlamps
    Reverse Glow Guages
    Viper Responder 791xv 2Way W/ Remote Start
    Pioneer AVIC N2 In Dash DVD/NAV Unit
    2 10" Infinity Reference 1030w Subs in Ported Box
    Infinity Kappa 63.5i 6-1/2 3Ways in Front
    Infinity Kappa 60.5cs 6-1/2 Components in Rear
    MB Quart DSC450 4 Channel Amp
    MTX 6500d Class D Amp

  7. #7
    Registered Doug-ie-Fresh's Avatar
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    I assume you searched cause that was the closest thing I could find.
    94 ZJ: Fully built and Very fast.

    98 ZJ Laredo 5.2: Fully built and very kush.

  8. #8
    Registered '97JGCLaredo's Avatar
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    Quote Originally Posted by Doug-ie-Fresh View Post
    I assume you searched cause that was the closest thing I could find.
    I have searched but could not find any images.
    1997 Grand Cherokee Laredo Char-Gold
    106k Inline 6 w/ Bosch Platinum +2 Plugs
    K&N FIPK GEN2
    Clear Corners (Looks Sweet)
    Sylvania Silverstar Headlamps
    Reverse Glow Guages
    Viper Responder 791xv 2Way W/ Remote Start
    Pioneer AVIC N2 In Dash DVD/NAV Unit
    2 10" Infinity Reference 1030w Subs in Ported Box
    Infinity Kappa 63.5i 6-1/2 3Ways in Front
    Infinity Kappa 60.5cs 6-1/2 Components in Rear
    MB Quart DSC450 4 Channel Amp
    MTX 6500d Class D Amp

  9. #9
    the logical one fixer5000's Avatar
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    this is from the 98 manuals but id think its the same
    Attached Images Attached Images
    99 grand cherokee...mine...gone... now its a 2011 toyota tacoma sport... double cab longbed 4.0 and the are cap to match... im loving it !

    98 grand cherokee...wifes
    nothing special just jeeps.....

    "GET THERE FAST BUT ARRIVE ALIVE "

    automation is the future of manufacturing in the USA... if youre a box packer youre screwed. get educated now


    my jeeps gone. two engines were just too much to handle. now i got me a toyota lets see how long that lasts

  10. #10
    Registered '97JGCLaredo's Avatar
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    Thanks fixer5000 for that image. My cruise control and HVAC work as they should. Does that mean that vacuum leak is out of the question? Anyone know what else to look for?
    1997 Grand Cherokee Laredo Char-Gold
    106k Inline 6 w/ Bosch Platinum +2 Plugs
    K&N FIPK GEN2
    Clear Corners (Looks Sweet)
    Sylvania Silverstar Headlamps
    Reverse Glow Guages
    Viper Responder 791xv 2Way W/ Remote Start
    Pioneer AVIC N2 In Dash DVD/NAV Unit
    2 10" Infinity Reference 1030w Subs in Ported Box
    Infinity Kappa 63.5i 6-1/2 3Ways in Front
    Infinity Kappa 60.5cs 6-1/2 Components in Rear
    MB Quart DSC450 4 Channel Amp
    MTX 6500d Class D Amp

  11. #11
    Registered '97JGCLaredo's Avatar
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    Anyone have any tips on where to look (known problem areas) when searching for vacuum leaks?
    Last edited by '97JGCLaredo; 10-08-2010 at 08:28 PM.
    1997 Grand Cherokee Laredo Char-Gold
    106k Inline 6 w/ Bosch Platinum +2 Plugs
    K&N FIPK GEN2
    Clear Corners (Looks Sweet)
    Sylvania Silverstar Headlamps
    Reverse Glow Guages
    Viper Responder 791xv 2Way W/ Remote Start
    Pioneer AVIC N2 In Dash DVD/NAV Unit
    2 10" Infinity Reference 1030w Subs in Ported Box
    Infinity Kappa 63.5i 6-1/2 3Ways in Front
    Infinity Kappa 60.5cs 6-1/2 Components in Rear
    MB Quart DSC450 4 Channel Amp
    MTX 6500d Class D Amp

  12. #12
    Registered '97JGCLaredo's Avatar
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    Can someone please guide me to where I should look for known vacuum leaks. Thanks.
    1997 Grand Cherokee Laredo Char-Gold
    106k Inline 6 w/ Bosch Platinum +2 Plugs
    K&N FIPK GEN2
    Clear Corners (Looks Sweet)
    Sylvania Silverstar Headlamps
    Reverse Glow Guages
    Viper Responder 791xv 2Way W/ Remote Start
    Pioneer AVIC N2 In Dash DVD/NAV Unit
    2 10" Infinity Reference 1030w Subs in Ported Box
    Infinity Kappa 63.5i 6-1/2 3Ways in Front
    Infinity Kappa 60.5cs 6-1/2 Components in Rear
    MB Quart DSC450 4 Channel Amp
    MTX 6500d Class D Amp

  13. #13
    the logical one fixer5000's Avatar
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    theres no such thing as a known vacuum leak...just follow each one and bend them to see if they crack easily. then start replacing them. check the joints carefully too...they also crack and leak...good luck
    99 grand cherokee...mine...gone... now its a 2011 toyota tacoma sport... double cab longbed 4.0 and the are cap to match... im loving it !

    98 grand cherokee...wifes
    nothing special just jeeps.....

    "GET THERE FAST BUT ARRIVE ALIVE "

    automation is the future of manufacturing in the USA... if youre a box packer youre screwed. get educated now


    my jeeps gone. two engines were just too much to handle. now i got me a toyota lets see how long that lasts

  14. #14
    Registered '97JGCLaredo's Avatar
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    Ok thanks. Just thought there were areas or fittings that are known to fail such as near heat sources.
    1997 Grand Cherokee Laredo Char-Gold
    106k Inline 6 w/ Bosch Platinum +2 Plugs
    K&N FIPK GEN2
    Clear Corners (Looks Sweet)
    Sylvania Silverstar Headlamps
    Reverse Glow Guages
    Viper Responder 791xv 2Way W/ Remote Start
    Pioneer AVIC N2 In Dash DVD/NAV Unit
    2 10" Infinity Reference 1030w Subs in Ported Box
    Infinity Kappa 63.5i 6-1/2 3Ways in Front
    Infinity Kappa 60.5cs 6-1/2 Components in Rear
    MB Quart DSC450 4 Channel Amp
    MTX 6500d Class D Amp

  15. #15

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    Make a stethescope with an 24" long piece of garden hose.

    Start the engine.

    Put one end of the hose to your ear, move the other end around the hoses and connections. You should hear a 'hiss' at a leak.
    94 5.2 Ltd.
    00 4.7 Ltd. Selec-trac
    98 5.9 Ltd.
    95 5.2 Ltd.
    62 CJ-5 - Chev 283 V8 - OD

  16. #16
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    Quote Originally Posted by Tcar45 View Post
    Make a stethescope with an 24" long piece of garden hose.

    Start the engine.

    Put one end of the hose to your ear, move the other end around the hoses and connections. You should hear a 'hiss' at a leak.
    Great idea! I will give that a shot. Is it possible to have a vacuum leak and still have cruise control and the venting working properly for AC/Heat?

    Or another question is, what would cause a slight sporadic idle? Would it be a vac leak? While the car is running and in drive at times I would have my foot off the break and as its rolling, I feel a slight push at times while its rolling. What can cause that?
    1997 Grand Cherokee Laredo Char-Gold
    106k Inline 6 w/ Bosch Platinum +2 Plugs
    K&N FIPK GEN2
    Clear Corners (Looks Sweet)
    Sylvania Silverstar Headlamps
    Reverse Glow Guages
    Viper Responder 791xv 2Way W/ Remote Start
    Pioneer AVIC N2 In Dash DVD/NAV Unit
    2 10" Infinity Reference 1030w Subs in Ported Box
    Infinity Kappa 63.5i 6-1/2 3Ways in Front
    Infinity Kappa 60.5cs 6-1/2 Components in Rear
    MB Quart DSC450 4 Channel Amp
    MTX 6500d Class D Amp

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