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Thread: EGR vacuum leak

  1. #1

    EGR vacuum leak

    alright. I have been trying to work out all the small bugs on my 1995 Cutlass Supreme SL 3.4 DOHC, and this vacuum leak is starting to get to me.

    First of all, I replaced the EGR to be sure that it is not the EGR itself, but it does the same thing. I got a new upper, and lower gasket, removed the old stuff, cleaned it up real good, none of the old gasket is left on the mating surfaces, and put it all back together.

    It still does it.

    When the car is running, my AC vents don't move off of defrost, but I think this is an unrelated problem. I had no idea the EGR was leaking, but I was spraying around the engine compartment with carb cleaner to check for a leak for the climate control, and when I hit the EGR with it, it stalled the car.

    I have sprayed the hoses behind the EGR, and the vacuum lines near it. It only stutters when I spray the EGR itself in that area between the egr and the intake manifold.

    Any idea what is causeing my leak?
    Last edited by bszopi; 05-14-2008 at 11:06 AM.
    Taylor
    1988 Olds Cutlass Supreme 3100 MPFI
    1990 Pontiac Grand Prix STE 3.1 MPFI
    1994 Olds Cutlass Supreme convertible
    1998 Lincoln Mark VIII
    "find something simple and complicate it"


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  3. #2
    LB62LHObbqftmfw 1988GTU's Avatar
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    Crack or sticking valve from an electrical issue.
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  4. #3
    Did you check your vacuum lines running to the ball under the left fender? The ones that go there under the battery are prone to cracking.

    You could also take off your EGR valve and disassemble and clean it, that may help.

    Plus did you run a small diameter brush thru the EGR line itself into the manifold? Sometimes they get very caked up with carbon and clog or otherwise severely restrict the flow.

    '93 Cutlass Ragtop LQ-1 -- Semi-retired over winters
    '06 Dodge Magnum SXT 3.5L -- My Daily Driver

  5. #4
    the vacuum globe holds pressure. I pulled the line off at the check valve, and it vented.

    I will try it with the connector unplugged first thing in the morning.

    If it was the passage blocked up, then it would not be causeing a stalling problem when I sprayed it with carb cleaner.
    Taylor
    1988 Olds Cutlass Supreme 3100 MPFI
    1990 Pontiac Grand Prix STE 3.1 MPFI
    1994 Olds Cutlass Supreme convertible
    1998 Lincoln Mark VIII
    "find something simple and complicate it"


  6. #5
    i went ahead and ran out there and checked it. I unplugged the EGR electrical connector, started the car, and then started spraying carb cleaner. It still does it.

    I have also replaced the EGR itself. Both the old one and new one does it, so it rules out a problem with the EGR itself.

    I am starting to think it might be a problem with the EGR adapter.

    Tomorrow I will take it apart YET AGAIN, and see if there is something I am overlooking. Either a problem with the adapter, or the intake manifold itself.
    Taylor
    1988 Olds Cutlass Supreme 3100 MPFI
    1990 Pontiac Grand Prix STE 3.1 MPFI
    1994 Olds Cutlass Supreme convertible
    1998 Lincoln Mark VIII
    "find something simple and complicate it"


  7. #6
    Okay. One problem fixed, and I caused another one.

    The EGR ADAPTER was messed up. I replaced it with a different one, and that solved the vacuum leak problem.

    HOWEVER, when I was trying to get the old one off, I guess I cracked the EGR tube, so now I have an EXHAUST leak.

    SIGH

    I have a spare one, but it is not in any better condition. I dont think it is cracked at least, but it is creased pretty bad. I guess as long as it does not leak, then it will be fine.
    Taylor
    1988 Olds Cutlass Supreme 3100 MPFI
    1990 Pontiac Grand Prix STE 3.1 MPFI
    1994 Olds Cutlass Supreme convertible
    1998 Lincoln Mark VIII
    "find something simple and complicate it"


  8. #7
    Because stock sucks... pocket-rocket's Avatar
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    If you have the EGR shut off in the ECM, why not just plug the hole in the exhaust manifold? Or do you have emissions testing down there?
    -60v6's 2nd Jon M.
    91 Black Lumina Z34-5 speed
    92 Black Lumina Z34 5 speed (getting there, slowly... follow the progress here)
    94 Red Ford Ranger 2WD-5 speed
    Quote Originally Posted by Jay Leno
    Tires are cheap clutches...

  9. #8
    We have emissions testing down here. As for shutting off the EGR in the ECM, this is a 1995. OBD 1.5 CRAP.

    I want it to work, but if it comes down too it, I will block it off until I can get a new tube. I need to be able to drive the car.
    Taylor
    1988 Olds Cutlass Supreme 3100 MPFI
    1990 Pontiac Grand Prix STE 3.1 MPFI
    1994 Olds Cutlass Supreme convertible
    1998 Lincoln Mark VIII
    "find something simple and complicate it"


  10. #9
    okay. It is FINALLY fixed.

    Here is the original setup that was causing the VACUUM LEAK.

    Notice that there is only HALF of a gasket in there.



    After I fixed the vacuum leak, I then had an exhaust leak. Here is my EGR tube that I removed from my car.





    Yup, it was in 2 pieces.

    This is the new pipe that I put in.





    It was a little creased at the end where the EGR adapter goes, but it does not leak, and that is the most important thing.

    I also took some pics of the working conditions.

    Here is the car as I worked on it.



    big ass fan to keep me cool.



    And the temp at like 6 PM.






    I also fixed the vacuum leak that caused the interior vents to not work. I now have AC vents. Now I just need a can or 2 of R134a and I am good to go.
    Last edited by 3100 MPFI; 05-10-2008 at 01:01 AM.
    Taylor
    1988 Olds Cutlass Supreme 3100 MPFI
    1990 Pontiac Grand Prix STE 3.1 MPFI
    1994 Olds Cutlass Supreme convertible
    1998 Lincoln Mark VIII
    "find something simple and complicate it"


  11. #10
    nice!
    Brian

    '95 Cutlass Supreme- "The Rig"
    3400 SFI V6, 4T60e
    Comp Cam grind, LS6 valve springs, OBD2 swap, Tuned
    2.5" DP/ 2.5" dual exh/ Magnaflow Cat/ crap mufflers/ 3500 Intake manifold/ 65mm TB
    TGP steering Rack/ 34mm Sway Bar/Vert STB/ KYB GR2's

    '08 Chevy Trailblazer SWB 1LT "Smart Package"- LH6 5.3L V8/4L60e, A4WD

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