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Thread: 1991 Plymouth Acclaim LE

  1. #21
    Garrett booster Turbo Mopar Contributor
    Join Date
    Jun 2016
    Janesville, WI

    Re: 1991 Plymouth Acclaim LE

    I'd bet replacing the valve stem seals will mostly if not completely stop the oil burning. If you use the right valve spring compressor it can be done pretty easily without removing the heads. Just remove the intake and the valve covers carefully remove the cam caps and use a compression gauge hose hooked to the air compressor to hold the valves up. You can usually tell if it's the valve stem seals just by looking at the plugs.

    As stated above the PCV system can suck in oil as well. In my experience it's not really an issue on the newer VCs. You can tell the difference by the location of the PCV valve. It's screwed into the VC on the older 3.0ls instead of the intake. A 91' should have the revised ones.

    I'll admit I'm guilty of using RTV instead of a gasket on the upper intake plenum. Sure makes it a b***h to remove.

    It's probably a good thing that it has no EGR with it burning oil. There was a layer of gunk at least 1/4" thick in my vans original plenum when I opened it up to port it(original engine burned oil for at least 50k miles).

    Cool car!

  2. #22
    Supporting Member Turbo Mopar Contributor Ondonti's Avatar
    Join Date
    Dec 2005

    Re: 1991 Plymouth Acclaim LE

    OEM springs don't even need a tool, just an wrench under a rocker shaft with no rockers (not that I am suggesting taking apart your only set of heads). I have parts, parts parts.
    1992 Duster 3.0 The Junkyard- Now - Megasquirt II/Extra. OEM 10:1 3.0 n/a.
    - Old - 11.5@125 22psi $90 Stock 3.0 Junk Motor - 516whp 519wtq 20psi 91 oct built 3.0 stock n/a computer
    1994 Spirit 3.0 - 12.3@113 15 psi - Daily Holset He341 280whp 304ft/lb @10psi
    1994 Spirit 3.0 a670 - Wife's - Disassembled
    1990 Spirit 3.0 E.S. 41TE
    1993 Spirit 3.0 E.S. 41TE
    1994 Duster 3.0 A543
    1990 Lebaron Coupe 2.5 T1 31TH
    1981 Starlet KP61 Potential driver, 1981 Starlet KP61 Parts, 1983 Starlet KP61 Drag
    1998 Dodge 12v Cummins 47re 4x4 4dr longbed

  3. #23
    Mitsu booster
    Join Date
    Jun 2017

    Re: 1991 Plymouth Acclaim LE

    Always loved the AA models too. Never had one with a 6, just the 2.5, but I'd have to look in PA and south to find a descent one. Every thing here in NY is rotted out from road salt. These things are unstoppable in the snow, I mean deep snow. Every now and then I pass one (or a Shadow) that can't be a NY car, too nice a shape. Just have to wait for some grandmother to part ways with her 60.000 mile gem.... G.P.

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