Question about 2003 Lincoln Aviator

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I have 2004 Lincoln Aviator. It's running rough and bad gas milage. I took it to the shop and they did a tun eup but it is worse. Check engine is on now and it is hard to keep running. Have any idea what is wrong? Thanks..

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  • rghilarducci Feb 18, 2009

    I have the same prob but no codes.

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You probably have a vacuum leak. I had this same problem and it is a $20 part that takes 5 minutes to replace. Open your hood and listen for a high pitch sucking or whistling sound. My vacuum leaks were around the back center of the engine on a rubber elbow that connected to the PCV valve. Then a year later the other rubber elbow went bad that connected near the back of the intake manifold.

Posted on Mar 18, 2009

  • arkki Aug 25, 2011

    I just had this very same problem. OBD II reader gave diagnostic codes P0171 and P0174 thus at first suspected the O2 sensor but then the whistling sound led us to the leaking rubber elbow. Like Jim said it was very easy to fix once we found the leak.

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Your mass airflow sensor may be dirty it is in line with the air box going to the throttle body has a 4wire or so plug going to it unplug this and see if it runs any better if so try cleaning it with electronics cleaner also try and have the codes read and post them back here and ill tell you whats up please rate good luck -jeff

Posted on Sep 05, 2008

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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


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.

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1998 k1500 o2 sensor rattle, truck runs rough. would that cause it to run rough?


If O2 sensor is bad it can cause Rough running. Are you sure it is the O2 sensor ratteling? Have you taken it out to hear Rattle? Is it loose? I have not Hears an O2 Sensor rattle. I have heard Converters Rattle. over time Inner Material of converter will Not have a tight fit due to heating and cooling. expanding and contracting. carses some of the material to wear away. Causing the it to rattle. and can cause rough running also.

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Rough idle and engine light is on my 2003 aviator 4.6 engine


If there is an Auto Zone around your area, have the truck scanned for the DTC codes which is causing your idle problem. There are to many things that can cause your trucks idle to be rough. Once you have it scanned, we can address the issue and have your truck running 100% again. Auto Zone scan free of charge and can give you the step by step instructions to repairing and replacing the parts needed. Good luck and keep me posted, be glad to help. 

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2004 lincoln aviator having a strange whining noise from the engine


I have an 03 and around 30,000 miles the same thing happened to me . I took it to the dealer and the replaces the idler pully wich is what was making the noise .hope this helps you

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On my 2001 Ford Focus. Bad gas milage, engine running rough, loud vibration when steping on the gas pedal.


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