Sticking Exhaust Valves
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Thread: Sticking Exhaust Valves

  1. #1
    Premium Member rtkraken's Avatar
    Join Date
    July 23rd, 2005
    Midcoast Maine USA

    Sticking Exhaust Valves

    Hey Guys,

    Anyone out there with a GEMS 4.0 that has had the "sticking exhaust valve problem?" I guess it's supposed to be a rather common fault on these engines as they age. Apparently the valves in this engine weren't cut to properly break carbon build up on the guides/stems.

    The vehicle starts, idles, and runs fine but throws a check engine light under heavy accelleration indicating misfire on #8 cylinder and excessive emissions. I've changed the plugs and wires with no change. I'm presently awaiting the return of my injectors from refurbishment, but don't have a lot of hope that this will solve things.

    I'm facing around $2K in repairs to get the heads rebuilt with new and proper valves. Anyone solved this with a less costly alternative?

    Side note: I had to do a little window shopping for a new vehicle to try and bolster my dedication to my Rangie, and it worked. Both wifey and I agree, nothing compares to a Range Rover.. when it's working.

    Best to all. Thanks.

    92 RR Classic (retired waiting resto)
    95 RR Classic (sold)
    95 RR P38 4.0 SE (200K)
    96 RR P38 4.0 SE (240K)
    07 RR HSE L322 (110K)
    01 Toyota 4Runner (203K)

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  3. #2
    Join Date
    July 29th, 2004
    Sunnyvale, CA
    guys on the discoweb tend to swear by a product called "seafoam". apparently you pour it into your crankcase and its supposed to clean out the valve train...

    ive also heard it creates a hell of a smokey exhaust while your cleaning out your engine...
    Ken N.
    2001 P38A, 4.6 HSE
    95 DI

  4. #3
    Join Date
    November 30th, 2004
    Northern California
    Yes, search for my previous post about Seafoam. It's lots of fun. Your neighbors will hate you. But it might help your problem.

    1995 Classic LWB
    2000 DII

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  6. #4
    Join Date
    November 1st, 2005
    Abbotsford BC Canada


    I heard this problem was more in discos because they run a manifold like the classics where as the rangies run a far better manifold, almost as good as a tube header.
    The classic style header does not let engine breath as well the rangie ones and thats why discos seem to have this problem,well so I heard as I am running a 4.6 in my classic and was told this may be a problem I may end up with due to using my classic headers.[/i]
    1993 Range Rover 4.6
    Maxi Drive rear Difflock, Snorkel, Non Viscous LT230 Transfer case, 4.6 engine, Arnotts Gen III air Springs and Bilstiens.

    1952 Series 1 80" Land Rover

  7. #5
    Join Date
    August 19th, 2005
    El Paso, Texas
    Sea Foam is great but DON'T put it in the oil it will destroy the engine seals. Run it through the upper plenum via a vacuum hose and through the fuel tank. Cleans like nobody's business.
    1999 Range Rover
    Callaway #42

    Fix or upgrade your air suspension at Rover Renovations.

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