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Thread: Any 5.4 experts out there

  1. #16
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    kirk, did you put RTV in the dimples at the 4 corners?
    The Blackbird
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  2. #17
    Join Date
    Mar 2004
    Location
    Baltimore, Md.
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    Quote Originally Posted by justbob View Post
    Worse yet is they stock the $500.00 fuel injection spider assembly for GM’s 4.3 thru 5.7’s too!
    Quote Originally Posted by MyBlackBeasts View Post
    That's too funny, I've never seen one fail!
    Quote Originally Posted by justbob View Post
    Seriously? I believe I’ve done four now.
    The poppets are known for sticking wide open causing long delayed starts and cylinder flooding ultimately causing a no start.
    Quote Originally Posted by MyBlackBeasts View Post
    Well I learned something today, good to know.
    With all the 4.3 V6 S10 p/u's, Blazers & Astrovans I've worked on (many with high miles) over all these years, never ran in to it.

    Thanks Bob.
    Quote Originally Posted by decipha View Post
    Ive changed my fair share of injector spiders on the 5.7s on suburbans and tahoes in my day. The cylinders usually fill up with fuel and require you to remove all the plugs and spin it over to get the fuel out. The first time I did one was on my bosses truck and the engine hydro locked after I had it all buttoned up and went to start it. I remember my sphincter was swollen shut til I heard it running actually run I was hoping and praying it didn't bend a rod and was half expecting it to hang a rod out the block.

    The plastic intakes are pretty common here too. In fact there is quite a few that still make it to us with stock plastic intakes.
    WOW!

    Blast from the past!

    My '96 S10 4.3L Vortec ran like a top until about 200K miles.
    Then it started to idle roughly and get really crappy gas mileage.
    Did some research and found out about the bad fuel injection spiders.
    Wasn't going to bother with that mess, so I drove it for another 35,000 miles and sold it.

    BTW: My brother has done the leaking plastic intake (recall) on his 2000 CV.
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  3. #18
    Join Date
    Aug 2003
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    Quote Originally Posted by RF Overlord View Post
    kirk, did you put RTV in the dimples at the 4 corners?
    Don't know what you're referring to? No RTV, unit comes with seals.

    Could be I should have replaced a couple more injectors.
    1963 Marauder S-55, Super Marauder 406
    Only factory 406 powered Marauder, and earliest built Marauder documented to still exist.
    https://sites.google.com/a/wmich.edu/supermarauder/
    ______________________________ _____________

    First retailed 2003 Marauder
    Bought 6 June 2002
    #168

  4. #19
    Join Date
    Feb 2017
    Location
    New Orleans, LA
    Posts
    262
    I would first clean the maf and replace the o2s

  5. #20
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    Aug 2003
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    Quote Originally Posted by decipha View Post
    I would first clean the maf and replace the o2s
    Many of the injectors were really dirty. The one I changed had stuff over the tip (making me wonder how it ran as well as it did). I think my cleaning may have done more harm than good on others. Could I have plugged one of the three nozzles? Would cause symptoms I'm having.

    174k on likely original injectors that were filthy. I'll change a couple more I think.
    1963 Marauder S-55, Super Marauder 406
    Only factory 406 powered Marauder, and earliest built Marauder documented to still exist.
    https://sites.google.com/a/wmich.edu/supermarauder/
    ______________________________ _____________

    First retailed 2003 Marauder
    Bought 6 June 2002
    #168

  6. #21
    Join Date
    Nov 2014
    Location
    KC
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    3,511
    02 sensors are doing their job saying you have a vacuum leak.

    Spray starting fluid, youll find it
    The twins2.3 whipple/aluminatorVortech V-2 lots of goodies

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  7. #22
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    Location
    Battle Creek, Michigan
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    Quote Originally Posted by Turbov6Bryan View Post
    02 sensors are doing their job saying you have a vacuum leak.

    Spray starting fluid, youll find it
    I hear you guys

    I'm still looking

    Thanks
    1963 Marauder S-55, Super Marauder 406
    Only factory 406 powered Marauder, and earliest built Marauder documented to still exist.
    https://sites.google.com/a/wmich.edu/supermarauder/
    ______________________________ _____________

    First retailed 2003 Marauder
    Bought 6 June 2002
    #168

  8. #23
    Join Date
    Sep 2002
    Location
    Cape Cod, MA
    Posts
    13,676
    Quote Originally Posted by kirk View Post
    Don't know what you're referring to? No RTV, unit comes with seals.
    It may not be a thing with the 5.4, but the Dorman 4.6 manifold comes with instructions to put a dab of RTV in the gasket-locating dimples in the corners of the heads to prevent vacuum leaks.
    The Blackbird
    Trilogy #61
    Driveway Queen

    The Spruce Goose
    2004 Grand Marquis LS Limited Edition
    Daily Driver

  9. #24
    Join Date
    Aug 2003
    Location
    Battle Creek, Michigan
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    1,578
    Quote Originally Posted by RF Overlord View Post
    It may not be a thing with the 5.4, but the Dorman 4.6 manifold comes with instructions to put a dab of RTV in the gasket-locating dimples in the corners of the heads to prevent vacuum leaks.
    Could be my problem, hope not
    1963 Marauder S-55, Super Marauder 406
    Only factory 406 powered Marauder, and earliest built Marauder documented to still exist.
    https://sites.google.com/a/wmich.edu/supermarauder/
    ______________________________ _____________

    First retailed 2003 Marauder
    Bought 6 June 2002
    #168

  10. #25
    Join Date
    Aug 2003
    Location
    Battle Creek, Michigan
    Posts
    1,578
    PVC hose at the valve
    1963 Marauder S-55, Super Marauder 406
    Only factory 406 powered Marauder, and earliest built Marauder documented to still exist.
    https://sites.google.com/a/wmich.edu/supermarauder/
    ______________________________ _____________

    First retailed 2003 Marauder
    Bought 6 June 2002
    #168

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