Question about 2002 Lincoln LS

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My 2005 Lincoln Ls is turning out to be a mechanics worst nightmare. Early last year the car stopped shifting properly became real jerky. The first mechanic thought it was the transmission, so I bought the rebuild kit. Turned out it wasn't the transmission. I also bought a new throttle body and output shaft sensors and I think tps sensors. The most recent mechanic also believed it was the transmission, he replaced my transmission with that of a 2006 Mustang. No difference. When I went to pick up my car he told me he believes maybe it is a electrical thing or it might be because of flooding some of the wires may be eroded. MY QUESTION IS WILL BAD WIRING OR A FAULTY COMPUTER KEEP YOUR CAR FROM SHIFTING PROPERLY AND IS THIS SOMETHING I CAN DO BY MYSELF?

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  • Lincoln Master
  • 5,495 Answers

Yes for the wiring and computer causing shift problems and maybe for you fixing it yourself.
One thing you might do is give an exact detailed account of what shift problems you are having. As in upshift, downshift, or which gears it appears to have problems with. Also is the same problem occurring with either transmission?
One thing you need to remember is that many problems are suppose to be reported by your onboard computer. Your "check engine" light also includes transmission defects. To some extent bad wiring will result in either a "loss of signal" code or "out of range" codes.
Strange as it may seem, have your battery and entire charging system checked. Autozone, Advance, and Oreily usually check those items free. All of your performance settings are based on a good battery voltage and low power will mean some values can fall out of range and affect shifting.
You have a few options. A bad wiring loom can be obtained from a Salvage yard. Some computers have rewriteable memories which can be reprogrammed if some mental gaps have been created by prior shorting.
Probably the best thing to do after having the battery and charging system checked is to break down and take the car to a Dealer for a different kind of diagnostic testing machine to be hooked up.
This machine is actually installed in your car and the car is driven on the road. This machine goes way beyond most handheld scanners. It monitors more components and can be rigged to be placed in-between wiring connectors to measure problems before and after where it is attached.
The chassis pin connector may have 100 wires at the junction, so you can see that a machine which tests 100 wires at a time can quickly detect a problem you would need many hours and a diagram to locate manually.
I believe different manufacturers have their own name for this machine. One used to be called an "Odessey" or "Oasis" I believe.
As for corrosion, another question is with the 2 repairs, did it shift correctly for a short time? Because the end connections were removed from the transmission and may have temporarily made clean contacts when reconnected.
I hope I have been of some help on this.

Posted on Aug 01, 2013

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Posted on Jan 02, 2017

bluedevil42
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SOURCE: steering wheel controls

change out the clock spring. i had this happen to me google the lincoln ls clock spring installation and then go to the dealership and purchase the part. it will run you about $138.

Posted on Aug 23, 2009

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SOURCE: 2003 lincoln town car code p0705 & p1702 changed tr sensor only when car starts

03 Town Car transmission whines & taps on very hot days only, changed fluid filter, trans cooler & radiator. Runs great on cool on days under 90 degress.

Posted on Aug 31, 2009

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SOURCE: 2001 LINCOLN LS V6 - ROUGH IDLE / SOMETIMES STALLING.

Very common problem is about a dime size hole wearing in the rubber elbow on the PCV valve located on the driver side rear of the intake manifold.

Posted on Oct 13, 2009

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What is the problem? What does the veh do,or not do?

Posted on Mar 09, 2010

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SOURCE: 2003 lincoln LS

usually shift kit makes for harder shift also verify engine is well tuned.

Posted on Apr 21, 2010

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