Last post on Oct 28, 2013 at 1:21 PM
You are in the Lincoln Town Car
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Lincoln Town Car, Auto Body, Engine, Suspension, Sedan
#917 of 1123 Re: 2005 LINCOLN TOWN CAR "SIGNATURE" [hja1]
Jan 07, 2010 (3:07 pm)
We bought a 2006 Town Car about 2 months ago and are having the same problem. Ford dealer said the car had warped rotors and "fixed" the problem. After that I crashed into another car because my car kept lurching as i was braking. My husband also had the same problem and narrowly missed hitting 2 people. Lincoln dealer cannot find a problem. Did you find out what was wrong with your car? I read in the forum that someone with the same problem was told it could be the throttle air control but I can no longer find that posting.,
Does anyone have any other ideas?
#918 of 1123 Disconnected MAF Sensor, Runs Like A Top... WTF?
Jan 15, 2010 (6:50 pm)
My '94 Town Car started idling rough and even stalling on occasion. I cleaned the throttle body and MAF sensor wires. After starting it back up, it was idling just as rough. This morning, after a cold start, it was still idling rough. Just for the hell of it, I disconnected the MAF sensor, and it smoothed out. Connected it again and it became rough. Disconnected, smooth... ????
Drove it 7 miles to work without a hitch. Ran great, as a matter of fact. Coming home, I noticed it was perfect from a cold start. Used to be a bit sluggish when cold.
I'm assuming I can eliminate plugs, wires, injectors etc. as the problem. Is it a given that the MAF Sensor is no good? Could it be triggering another bad component, like the Idle Air Control, or EGR valve? What am I risking by running it as is, with the MAF Sensor disconnected? I really can't afford to just throw parts at it.
#919 of 1123 Re: Disconnected MAF Sensor, Runs Like A Top... WTF? [0rnery]
Jan 15, 2010 (7:19 pm)
I understand that great care is to be used in cleaning the wires of the MAF for they are rather tender. If in the process of cleaning, they were damaged, perhaps a new MAF sensor is in your future. I agree that you have ruled out other ignition parts and wonder what is at risk if you drive without the MAF sensor connected?
How many miles on your engine?
#920 of 1123 I'm Broke & Befuddled
Jan 15, 2010 (7:45 pm)
Like I said, I can't afford to just throw parts at this. Just got done reading the story of a fellow with the exact same problem. He replaced his MAF Sensor ($75.00) with no improvement. Also, read about the cleaning procedure, and Failure Mode and Effects Management (FMEM). Moved on to vacuum leak detection. I'll try and track down leaks in the morning. Won't cost me anything but time. The leak detection source mentioned a stuck EGR valve ($50.00) being a culprit. I'm also worried about the Idle Air Control Valve ($75.00). I've got an old one on my bench, and am unable to "unstick" it.
I used spray carb cleaner liberally on the wires. I suppose I should have used the "Tuner Cleaner" instead.
This car only has 125,000 miles on it, but our Northeastern Ohio winters are taking a toll rust-wise. With such a short commute, I can afford to take a hit on gas mileage, but I'd hate to hurt the engine due to a rich mixture, or similar damage.
If I figure this out, I promise to post the answer. Thanks loads for the super prompt reply.
#921 of 1123 I Think I Fixed It
Jan 16, 2010 (6:36 am)
A couple hours, and a couple bloody knuckles later, it seems to be back to normal. Pulled the Idle Air Control Valve and noticed the connector may not have been attached. Its socket is damaged and unable to clip tight. Not 100% sure it was connected at all, because it fell free of the IAC as I removed it.
Cleaned it and used needle nosed pliers to work the shaft up and down freely, however the valve doesn't seat in the default state. It's about .05" open, but has free movement to seat. Applying 12VDC in one polarity merely shorts, and the other way hums, but doesn't move. The IAC I have on my bench is a different style, but will hum with either polarity, yet not move up or down. Obviously, I don't know what kind of voltage this thing operates with.
After a struggle of an installation the car started and idled OK. Not super smooth, but OK. Disconnecting the MAF Sensor didn't affect it. Seemed a little "lumpy" while pulling out of the drive, and a bit sluggish once on the road, but smoothed out nicely after the first stop. Idled fine, and accelerated great. Every stop after that was a nice idle. I suppose I should relearn the idle. Hope to be done with it otherwise...
#922 of 1123 Re: I Think I Fixed It [0rnery]
Jan 16, 2010 (8:46 am)
Was your problem lurching (accelerating) while braking? That was our problem.
#924 of 1123 acceleration while brakiing
Jan 16, 2010 (6:29 pm)
I don't know what a brake booster is so I don't know if it was leaking. Lincoln mechanics could not find anything wrong with the car.
#926 of 1123 Re: Are you using cruise when this occurs? [0rnery]
Jan 17, 2010 (12:21 pm)
No, I don't use cruise control. I don't even know if it works on this car because I didn't try it.