Question about 2003 Lincoln Aviator
O.K. here we go. Noticed poor Idle and bad (worse ) gas milage in local driving. Took car in for survice before vacation to S California had rough idle checked and engine miss checked. Was told no codes. Drove over the grape vine to LA car had so little power had to shift out of overdrive on approach to the big hill. Lower gears only over hill with car missing intermidently. Milage bad. Usully got 18 to 20 on road was getting 16. on return home took car to ford again still no codes but cop was replaced on one cylinder. Better but still miss and no power. returned to dealer. Dealer did compression and leakdown and you guessed it bad head #7 and #8 cylnder. Still no codes. Now with new head and one or more new coils Idle is still rough, and I still have an engine miss after the car has been driven for 30 min or more. Engine misseds on transition from no throttle to light throttle,and between 50 and 65 miles per hour on light throttle as in going up a slight incline and trying to maintain speed. Engine feels like it is light on torque (shifts more frequently than it used to) and uses 15 to 20% more fuel than before problems began.... still no codes! Dealer called Ford tech. and didn't get any help.So I have an Aviator that has 38000 miles on it, and will be out of warrantee as soon as the current work ticket is closed, and ford can't fix it. ANY ideas on what the poblem might be or any one with simular prob to point me in the right direction will be GREATLY appreciated.
Might be silly but I had the same problem on my 2001 Navigator. Finally found out it was a bad pcv valve causing the poor idling and lowered gas consumption. A CHEAP fix for sure. Also check your vacuum hoses as one could be bad, they do rot after awhile and cause small vacuum leaks which can cause bad idling etc.
Posted on Jul 24, 2010
I HAVET HE SAME PROBLEM WITH HEAD # 7, THEY SAY I NEED A NEW ENGINE? $ 5000, DON'T KNOW WHAT TO DO?
Posted on Feb 26, 2010
Hate to be a late in reply, but had the same problem. Might be the one or more of the coil packs, and I extremely doubt the engine is bad. My Tuffy mechanic said a $107 Ford vaccum hose (plus labor) was leaking causing rough idle, poor performance, and bad gas mileage. Here I spent 2-weeks under the hood, spark plugs, coil packs that didn't reinsert correctly all because a leaky vaccum hose was changing the timing...Best $250 I ever spent and no problems after that.
Posted on Nov 06, 2014
Ive done all that new cops ( coils), plugs , getting misfire codes and #2 cyl misfire. On a chance I switched 1 and 2 fuel injectors.... New codes were misfire # 1 so the fuel injector is bad. Bad fuel economy not to mention rough idle and loss of power. Whew!!!! Depending upon miles. Less than 100k I wouldn't suspect a bad head but ford does acknowledge they have problems so first a compression test then if good 150 lbs or all average same then ck injectors. Hope this helps save you time.
Posted on Mar 14, 2013
Crank case vacuum line. Common problem with fords. Ive replaced all coil packs plugs and cat conv. Cheap dix on top of motor takes 10 seconds to fix. Wish i wouldve known that $5000 dollars ago.
Posted on Aug 06, 2012
I have an '04 with same problem. Keep bugging the dealer until they replace all of the old coils with the updated version! They will resist! Everytime mine goes in for a service I get one replaced. I only have 2 to go before they will all be replaced. One coil was so weak it had fouled the spark plug but of course it had not thrown a code yet..... It runs smoother, no longer hesitates and has more power than it ever has! The difference is night and day! This is a great motor and it is sad to see people missing out on the full potential because of crummy coils....
Posted on Feb 02, 2010
I have 03 aviator and have had this problem since i have gotten mine. I have been told that the coil pack was bad and had to take it on 3 separate occasions to have checked/replaced. Lincoln has extended the warranty on this item for 100,000 miles from my understanding. Every time i noticed the problem the check engine light never came on. I saw similar signs, rough idle, transmission would shift hard at higher speeds, going up inclines/hills would cause the transmission feel like it was slipping and i would hear the lifters rattling. Hope this helps
Posted on Mar 21, 2009
Has anyone tried to check the wiring on the secondary side of the coil packs (the 12 volt wiring coming from the computer?) sounds like one of those wires might be shorted or open. also might be the computer itself... at least that seems like the most logical places to look next, for me, although i could be way off... hard to tell without being able to look at it myself or drive it. let me know what you find, i know that wiring can be tricky. look for maybe a rodent thats chewed trough your wiring or something tthat might have cut through your wiring, would be the most obvious. electrical is not always about the obvious though.
Posted on Feb 18, 2009
a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Nov 30, 2015 | 2004 Lincoln Aviator
It can be issue
with IAC( idle air control valve) causing the problem.
are many other possibilities causing these idle issues.Engine idles rough.
are few help links with solutions to troubleshoot such idle issues.
suggest you refer the link below and follow
its troubleshooting details:------
the link below:-----
Bad miss at idle? http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html
Stumbling and stalling at idle after engine rebuild?
1999 Ford F-150 Idles rough and quits when gas pedal is pressed less?
Engine stumbles coming off idle when warm?
Erratic idle on car?
Cold start problem and vehicle shudder around 2500 to
Low idle when cold out side?
GMC Sonoma Stalls and idles low
GMC Idle Air Control (IAC) Valve Replacing?
1996 Camry intermittent engine failure while idle?
Engine quits at idle?
Car overheats and Air blows hot at idle?
While stop engine idles like cylinder missing?
Idle flair is noticed on car? Rough idle? car will not idle? Erratic idle speed?
High rpm in neutral? Inconsistant high RPM in neutral?
Vehicle stumbling at idle and shows code 54?
Rough idle, staling and Erratic shifting?
While stop engine idles like cylinder missing?
details will help.
Nov 24, 2012 | 2001 Ford Taurus
Jun 25, 2011 | 2003 Lincoln Aviator
Dec 08, 2010 | 2004 Lincoln Aviator
Jun 13, 2010 | 2004 Lincoln Aviator
Apr 02, 2010 | Mercedes-Benz 190-Class Cars & Trucks
Jul 24, 2009 | 2004 Lincoln Aviator
Jul 05, 2009 | 2003 Lincoln Aviator
Sep 05, 2008 | 2003 Lincoln Aviator
7,640 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: