Question about 2003 Lincoln Navigator

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2003 NAVIGATOR #6 CYLINDER COMPRESSION

I HAVE A 2003 NAVIGATOR AND THIS IS THE 2ND TIME THAT I HAVE HAD A #6 CYLINDER DROP ON ME. THE FIRST TIME THIS WAS A TOP JOB AT $2350.00 AND HAVE PUT 15000 MILES ON IT SINCE THEN AND NOW IT IS BACK. wHAT IS UP!!!!!!!! IT NOW HAS 91000 MILES ON IT. A MECHANIC(NOT THE SAME ONE) TOLD ME THAT HE WOULD HAVE TO TAKE THE HEAD OFF AND REPLACE THE CYLINDER. COULD IT BE ANYTHING ELSE. I SERVICE IT REGULARLY AND USE HIGH OCTANE FUEL....HELP

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When you talking about drop #6 cyc, did you mean you had to replace the piston and the rod its self? if you had to replace piston and the rod, what took place that you had to replace them? did you throw a rod or the rod was knocking so you had to replace it. If you replace #6 piston due to a rod knocking or you threw a rod for the second time i wonder if that mechanic inspected the main crankshaft it self. if you threw a rod or it knocking 90% of the time you probably have damaged your crankshaft by scuffing it. scuffing the main crank will not be the same, it can be a hair line scuff, it will take no time before your crackshaft will start wearing out the new rod bearing. scuffing up a crankshaft without having machine shop turn it to smooth out any scuff or damages, it will eat and chew up the new rod bearing like its no tomorrow and your rod will knock again. keep in mind, sometime crankshaft is too damage or scuff to be turn or repair it must be replace. There is no reason if that mechanics done it correctly, you should not have any problems from the same cyclinder; it tells me he did a horrible job although he may got in too deep into the engine and decide to cut cost without fixing it and went ahead and fix it knowingly he should done a proper job. If you have to keep placing the rod and the piston due to the crankshaft wearing out the rod bearing, it tells me you have a bad crankshaft. its not worth replacing and fixing due to the cost factor. you better off to get a used motor from a junk yard for 800-1000 bucks. I hope that help some..

Posted on Jul 19, 2009

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Your mechanic is right. Its absolutely ridiculous, but it needs to be replaced. You can get the original one taken off and re-drilled at a machine shope though. The cost is SUBSTANTIALLY less than hetting it done by the dealer, but you will be with out your car for a few days.

Posted on Jul 15, 2009

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Have 2005 lincoln aviator - has miss at 30-55 MPH - no codes replaced all coils ( ford) & spark plugs (twice) - repair vacuum leak at PCV Still misses -- no codes -- help


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Slim possibility, but very expensive unless you have a service contract.
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:
  1. Perform relative compression check on all cylinders. If abnormal, check cylinder leakage and actual compression for "low" cylinders refer to Workshop Manual (WSM), Section 303-00.
  2. If leakage/compression check indicates a valve train concern, per valve train diagnostics in WSM, Section 303-00, replace cylinder head and cam assembly, pipe plugs and timing chain tensioner, per procedure outlined in WSM, Section 303-01.
  3. If cylinder leakage and compression tests are inconclusive, perform misfire diagnostic, per TSB 05-22-8. NOTE: DO NOT TRANSFER SPARK PLUGS. INSTALL NEW SPARK PLUGS IN REPLACEMENT CYLINDER HEAD AND CAM ASSEMBLY. NOTE: THE ENGINE MISFIRE CONCERN IS TYPICALLY EXHIBITED ON THE LEFT HAND CYLINDER HEAD AND RARELY ON THE RIGHT HAND CYLINDER HEAD. UNLESS CONFIRMED, THE RIGHT HAND CYLINDER HEAD SHOULD NOT BE REPLACED AS AN "EXTRA MEASURE" SERVICE PRECAUTION. NOTE: THE REPLACEMENT CYLINDER HEAD WILL NOT IMPROVE OR REDUCE ENGINE HORSEPOWER OR TORQUE ABOVE ADVERTISED LEVELS.

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