Question about 2003 Lincoln Navigator

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2003 LINCOLN NAVIGATOR: ROUGH IDLING AND SOMETIMES SHUTS OFF, CHECK ENGINE LIGHT IS ON BUT NO CODES SHOWS UP ON SCANNER

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Check air filter if it's dirty replace, replace fuel filter. these are the most neglected things on a car. If you need more help let me kow.
Randy

Posted on Nov 09, 2010

Testimonial: "THANKS FOR THE HELP, I REPLACED THE AIR FILTER. I AM NOW TESTING IT BEFORE I REPLACE THE FUEL FILTER. I WILL ADVISE LATER OF THE RESULT."

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6ya6ya
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2000 Lincoln Navigator - few days ago started idling very rough when truck is at a stop or in park. Service Engine Light came right around time I noticed that it was idling rough when stopped. Following...


P1131 Lack of HO2S-11 Switch ,Sensor Lean
P1151-Lack of HO2S-21 Switch ,Sensor Lean
PO171- System to Lean (Bank 1)
PO174-Systen to Lean (Bank 2)

Fuel Filter -Plugged
Low Fuel Pressure
Evap System -Leaks
Leaks - in ducting,air filter to throttle
PCV -Leaks
Exhaust System -Leaks
O2 Sensors-worn out

Apr 06, 2011 | 2003 Lincoln Navigator

1 Answer

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


The COPS (coils) may have shorted the drivers in the PCM (computer). You should get a misfire code for each cylinder misfiring though.

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.

Sep 24, 2010 | 2003 Lincoln Aviator

1 Answer

My engine light is on.


Hi,


The check engine light comes on mostly when you have bad gas tank cup,or you don't tight enough the gasoline.Go to any auto-zone and request the obd scanner,at no charge just leave your driver license or credit card,connect the scanner follow the instructions.They will check up and the check engine light will come off in the next 3 to 5 days.


Thank you !!

Jul 22, 2010 | 2003 Lincoln Navigator

1 Answer

2002 lincoln ls


You can get an ACTRON scanner from Sears. The regular or plus version ($179). Harbor Freight sells scanners too.
But, you can go to AUtozone or most other stores and get the codes read for free when the CEL is on.
Get codes, report back before buying anything.
Sometimes codes are caused by other engine problems that influence the sensors and turn the light on.

The rough idle will usually be a misfire code.

I checked for TSBs. None found for 3.9L engine

Feb 17, 2010 | 2002 Lincoln LS

1 Answer

Check engine lights stays on with rough idle 2004 lincoln avaitor- what sensor needs to be replaced?


You will have to connect a scan tool to the vehicle to pull any codes that the computer is sending.
The number of the code will help us find the problem.
A rough idle could be a fuel or electrical problem.
Please let me know what you find.

Feb 09, 2010 | 2004 Lincoln Navigator

1 Answer

Loping when idling


Any time that the check engine light comes on, it indicates that the computer has found a condition serious enough to require service action. Rent a scanner, read the code(s), and pursue to repair(s). The scanner will clear the trouble light when the repairs are complete.

Oct 24, 2009 | 2003 Lincoln Navigator

1 Answer

98 Lincoln Navigator Check Eng light on


fuel pump is going out causing the truck to run lean and miss

Aug 22, 2009 | 1999 Lincoln Navigator

2 Answers

2000 Lincoln Navigator with rough idling and service engine light


i had the same trouble, there is a rubber boot under the cover on the top of the motor, it is coming from the egr valve, takes about 5 mins to repair and less than 5 dollars.

Jul 21, 2009 | 2003 Lincoln Navigator

3 Answers

Misfire still after plug boot and coil?? 02 Navigator


you most likely have a problem with you cylinder head. Very costly job, but it needs to be replaced. You can find a machine shop who will realign the heads and

Jul 09, 2009 | 2003 Lincoln Navigator

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