Question about 2004 Lincoln Aviator
44K miles engine has ran perfect. Today on the freeway all of a sudden hesitation between 55-70mph. Then hesitation spread to 25-40mph in town stop and go and is getting worse the entire time driving. Idle seams normal, very smooth with no miss fire sounds at all. Wide open throttle has bad hesitation/miss fire feel as transmission kicks down but then clears up and produces good strong full power. Normal driving the hesitation/miss fire is continuously getting worse.
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Posted on Jan 02, 2017
SOURCE: 1997 lincoln town car idiling
Hi, a Town Car engine that idles to low can cause the engine to die when decelerating or misfire during acceleration. Sensors, a vacuum leak or throttle problems can cause this low idle problem in the Town Car.
One of the most common causes of idle in the Lincoln Town Car is carbon buildup in the throttle. This carbon causes the Town Car engine to idle lower than normal because vapors from the crankcase enter into the engine system and into the intake system, which eventually goes to the air box. Soot is carried in these vapors and onto the throttle plate causing the throttle to not open and close properly. Correction for this throttle problem is to clean the throttle plate with a cleaning solvent.
The Lincoln Town Car has several sensors that can cause the engine to idle too low, creating a stall during deceleration. Speed sensor, throttle position sensor and MAP sensor failure can all be culprits. The computer on the Town Car uses the speed sensor to determine what speed the Lincoln is running. When the speed sensor fails, the computer does not know how fast the automobile is going, causing the Town Car to idle too low during deceleration The MAP sensor determines the intake mixture of fuel that goes into the injectors. When this sensor fails, the engine may idle erratically. The throttle position sensor tells the computer when the throttle is opened or closed. When the computer does not know if the throttle is closed, the computer compensates and allows the engine to idle too low.
Lastly, vacuum leak can cause the Lincoln Town Car engine to idle too high or too low. The larger the vacuum leak, the higher the engine idles in the Town Car. A small vacuum leak is difficult to detect and there are several hoses on the Lincoln engine. The Town Car owner needs to check every hose on the engine, but when the engine is idling too low, the intake manifold hoses generally have a small leak preventing the hose to maintain a compete vacuum. The Town Car needs to be taken into the dealership and placed on the diagnostic computer in order to determine which hose is leaking. Once the hose is identified as causing the vacuum leak, then the hose needs to be repaired or replaced.
Posted on Feb 20, 2011
Hey Bill, To answer your question about injectors, without a scanner capable of performing a injector balance test its very difficult to narrow down a clogging injector, you could however get a injection cleaning done at the shop of your choice, or even try a fuel additive to pour into fuel tank, however based upon the work you already have done, and the drive-ability your experiencing I would say you have a bad upstream O2 sensor. Bank 2 should be passenger side next to exhaust manifold. If you have access to a scanner you could check the O2 switching, however, I think that's your problem. Fuel pressure would cause both banks lean, vac leaks would really affect idle, and a ignition problem would usually set a misfire code. One thing you could try however which i have had success with is cleaning your mass air flow sensor, auto part store stock it, very easy to perform, i have had luck with it in the past, if dirty it can throw fuel trims out of spec. If you need any thing else let me know, and make sure you let engine cool for a period of time before touching any exhaust areas.
Posted on May 07, 2011
Testimonial: "Hi Mechxd Thanks for your input,you have answered my question and given me a new approach to the problem . I will pursue those issues. Thanks Bill"
SOURCE: I have a 1991 town car and when its cold it runs fine,,after 20 miles or so it starts to hesitate and sounds like its missing,,the problem is worse when the weather gets hot,,the car runs better in th
The small wires on the altenator could be broken. The insulation will still be intact. Try to stretch the wires but dont pull them out of the connector. If one stretches, the wire inside is broken. Splice it and it should fix it. It supplies the feul pump when the engine is running. If it is fractured, then not enough power goes to the pump. If no wires are bad, try replacing the air intake sensor. It is right by the mass air and is round with two wires and just pulls out.
Posted on Dec 29, 2012
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