Question about 2004 Lincoln Navigator

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2004 navigator we have in the shop a 5.4 3 valve with a engine miss at idle . cylinder 8 . installed new plug and coil and injector. we havent done a compression test yet and waiting for the customer to bring it back in. but still is setting code for 8 cyl. any ideas?

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  • paul erickson
    paul erickson Sep 12, 2008

    tried the noid its getting the signal to the injector . yea i agree the SBDS is a great tool but way too far out of our range we have the OTC Genesis . which has done us a good job.
    just wondering if you have run into this before?
    i saw a service bulliton on this and they say to replace the head. but doesnt give any info on why or what is wrong with the head?

    also i like this fixya but im seeing alot of so called experts giving answers that they have no idea on what is going on. do you agree??


  • paul erickson
    paul erickson Sep 12, 2008

    will do as soon as the customer brings back in

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  • Lincoln Master
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Have you used a NOID light to see if injector is getting a signal, the NOID lite is a little test tool that plugs in the injector connector and flashes when eng is running is signal is present, a vacuum leak can cause this as well, also the injector can be faulty, check the compression 1st, then do the other tests, I was a dealer tech so I had access to a piece of test equip called a SBDS, it could quickly give me all the info about the miss-fire, most case knew the problem in 10 minutes, of course the machine cost $75,000 so in a independent shop it is out of the question. Good Luck

Posted on Sep 12, 2008

  • yadayada
    yadayada Sep 12, 2008

    Yes many tiimes, but when I retired the 5.4 was a new engine to the line, I am a retired Ford Factory certified master electronics tech, the steps I recommened are what I would do, have you run a cylinder balance test, can your test rig do that?

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LINCOLN: 1999-2004 Navigator
2002-2003 Blackwood
2003-2005 Aviator MERCURY: 2003-2004 Marauder
ISSUE: Some 1999-2004 Navigator, 2002-2003 Blackwood, 2003-2005 Aviator, 2003-2004 Marauder and 2003-2004 Mustang vehicles built before 12/19/2004 equipped with 4.6L 4V/5.4 4V engine may exhibit a runs rough, lacks power, and engine misfire, prompted by a MIL light and DTC codes P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, and P0316.
ACTION: Diagnose engine for engine misfire concern. If diagnostics determine an engine misfire which is characterized by leakage through exhaust valve(s), only replace the affected cylinder head(s).
SERVICE PROCEDURE FOR VEHICLES WITH RUNS ROUGH/MISFIRE CONDITION:
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