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03 lincoln tc

ROLLIN55

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nc
Thread starter #1
hello just joined an first town car bought couple weeks ago 146k drove great but recently noticed hesitation after 30 up to normal speed limit. ive read many post on here and other sites but it is overwhelming trying to figure some sort of direction, what i have done myself is motor craft plugs, 8 mid grade coils because motor craft brand are so expensive also a new egr valve. im going to replace fuel filter soon. any other ideas maybe sensors? thanks for the support.
 
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Town

Senior Member
3,688
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38
Ottawa Ontario Canada
#2
Welcome to the Forum. Congratulations on your new car.

Just to confirm the hesitation is occurring momentarily any time you try to accelerate between 30 mph and 75 mph, or for a consistent acceleration the car will hesitate repeatedly? How does the car respond when in cruise control?

I would suspect the throttle position sensor is worn, perhaps due to predominantly being highway driven. The throttle position sensor can be tested by reading the resistance value as the throttle is opened from idle to full throttle and back to idle. The resistance in ohms should increase in one direction and decrease in the other. If there is a worn segment the resistance may drop to zero at that point, so you are looking for a consistent change in ohms.

I don't have a procedure for the 2003 model and the 2007 model is a different configuration. If you need help with identifying the throttle position sensor or how to test it I will get a 2001 procedure that is probably the same as your car.

Good luck.
 

Town

Senior Member
3,688
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38
Ottawa Ontario Canada
#4
I've never done that test but expect that an analog test meter (with the needle that moves up and down) would be easier to read than a digital for this test.
It could be if you are used to analogue instruments. But the digital works well. You can see the numbers change and when the gap is encountered the display shows zero which is instantly recognised. An analogue display would also be easy to see.
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ROLLIN55

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nc
Thread starter #5
hello its taking me sometime to reply back, you sure know your cars , yes its neat how you mention highway miles it was a preachers car i was told he would do long drives to pass the good word. i still feel the hesitation in driving, there is a difference in cruise control engaged seems to go away a bit. well after 2cans of fuel injector cleaner last 2weeks and replacing the fuel filter i thought it wouldve solved looked like the original an needed to be changed anyway. im not really sure of the testing sensors as you mention so i just bought a new one. i seen the location of the old one with 2 screws facing couple inches from the firewall. you have to remove part of the TB to access other side. when i had it apart noticed it was brownish on the ends from the plate i took off, then i looked into the TB seen 2 ports, one about the size of pencil the other size of a dime. only the areas around was dirty guess that is the problem or the injectors,would that cause a car to give problems like this? i thought it would really have to be gumped up. i didnt have time to clean it then but will monday or tuesday morning. i have to admit to my friends it most of surely rides better than my 05 cadillac dts. i couldn’t amagine what a new one is like. what else you think could it be? thank you again for any suggestions.
 

dave42

Senior Member
#6
I would suggest attaching a scanner (various auto parts stores will do this free) to see if the car is throwing any error codes. If you have a miss it can tell you what cylinder, then you can figure out if it is coil, plug, or injector. Swapping coil pack from a cylinder showing an error with another cylinder will narrow down whether it is the coil or not.

My car just had this problem a few days ago. It was fine at constant speed but missed during acceleration. Code thrown was P0305 which means miss on cylinder 5. Swapping coils between 5 and 6 actually made the problem go away, though that may be temporary.
 

Town

Senior Member
3,688
21
38
Ottawa Ontario Canada
#7
hello its taking me sometime to reply back, you sure know your cars , yes its neat how you mention highway miles it was a preachers car i was told he would do long drives to pass the good word. i still feel the hesitation in driving, there is a difference in cruise control engaged seems to go away a bit. well after 2cans of fuel injector cleaner last 2weeks and replacing the fuel filter i thought it wouldve solved looked like the original an needed to be changed anyway. im not really sure of the testing sensors as you mention so i just bought a new one. i seen the location of the old one with 2 screws facing couple inches from the firewall. you have to remove part of the TB to access other side. when i had it apart noticed it was brownish on the ends from the plate i took off, then i looked into the TB seen 2 ports, one about the size of pencil the other size of a dime. only the areas around was dirty guess that is the problem or the injectors,would that cause a car to give problems like this? i thought it would really have to be gumped up. i didnt have time to clean it then but will monday or tuesday morning. i have to admit to my friends it most of surely rides better than my 05 cadillac dts. i couldn’t amagine what a new one is like. what else you think could it be? thank you again for any suggestions.
The process you describe for replacing the TPS does not sound right to me. The TPS is fastened to the throttle body with 2 screws and it fits over the throttle plate extension. Can you confirm the attached procedure for replacing the TPS from a 2001 model? Perhaps I am misunderstanding.

Since your car has 146,000 miles and the spark plugs are scheduled to be changed at 150,000 miles then that would be my next step. You need to replace all 8 and not just the ones that may be misfiring if you check the DTC with an OBD2 reader or scanner. We have a Tech forum with articles on some common repairs which includes replacement of the spark plugs which you will find here: https://lincolnforums.com/forums/threads/10500-Town-Car-spark-plug-replacement see post #2 for the pdf document.

The throttle body will not likely be the cause of any issues on your car. The brown stain is from fuel blowback and would only be a problem if there is a buildup of deposits around the throttle plate that may interfere. Ford say not to clean the throttle body due to a special coating used; some people reject this idea and clean it anyway. Unless you have noticeable deposits then it is not worth the risk, especially since your concern is at higher throttle opening.

Good luck.
 

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ROLLIN55

Junior Member
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nc
Thread starter #8
hello i wanted to say finally service engine light came on after 3weeks of not knowing, i know that sounds crazy for some kinda hoping for it to happen, i had a guy use scan tool to help figure the hesitation, it sent a p1406 code an i sorta figured it out. but at least i won’t have to do anymore tuning it up lol. i guess i should’ve describe it better, that link you sent of the tps is right its just mounted on the back side on one end of TB its very simple to remove. thank you for the guidance on this forum on how to do it the right way definitely helps.
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ROLLIN55

Junior Member
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nc
Thread starter #10
hey again i seem to still have that hesitation or maybe misfire, ive noticed a pattern when cold first start up runs smooth till it gets about 4-5 miles down the road or warmed up some then it starts happening at any speed now even on cruise control, like before after replacing other parts i would only drive a mile or two with no codes showing up thinking it’s finally fixed but it wasnt. the p1406 code downstream line wasnt secured the last time, i just had to push a little harder on it then it was fine. ive search online read so many reviews stories even dated back 10 years ago, hopefully someone can give me a sense of new direction because im running out of ideas of what is causing it. im no mechanic but found working on this car is easier than i thought. just curious i made appointment to the dealer wanted them to see if i was overlooking anything. the parts guy ran off a diagram of exhaust an motor for this car which looked nothing like mine he recheck seen that the car came out january of 2004, this car was in the middle of changes being made guess do to the emissions. the pics then match up, example like egr or the way connections changed. i left came back to the ford dealership waited on premises 4 hours until i was out of patience total time of them holding the car 7hours only to tell me they couldn’t figure it out an would’ve done everything i did. i couldn’t believe what he was saying, the guys drove it twice putting 13 miles around town but as he said in the beginning no charge to check it out. nothing else he could do unless i came back for valve cover removed an inspect internal block. i said no thanks left. i figured it up on the labor per hour for the work i did saved over 3k. anyways this is revised on what ive done so far, put 2cans of injector fluid in the beginning, then motorcraft plugs,new coils, new fuel injectors, new egr valve, air filter, new tps, fuel filter, cleaned maf sensor on air box twice cleaned throttle body really good, expected all vacuum hoses like they did. seen no dry rotted or holes in the lines. ive read watched alot of videos sorta figure other areas an needed some opinions or guidance with this that hopefully wont cost to much more. im thinking either a new maf sensor instead of cleaning it? or maybe o2sensors since this is a fuel air mixure issue. alternator failing? the convertor packed out since plugs plays a part together. not much more i can think of lol. thanks for your advice
 

Town

Senior Member
3,688
21
38
Ottawa Ontario Canada
#11
Since Ford spent 7 hours driving and checking your car and found nothing then that is significant. To look deeper into the engine, I would say the next step would be a compression test rather than removing the valve covers and checking for some kind of valve train problem.

To do a compression test you need a compression test tool that screws into the spark plug threads and has a compression release button on the side. Remove all the spark plugs and insert the tool in each spark plug hole in turn from 1 thru 8. With the compression tester installed crank the engine for 3 to 5 turns with your foot on full throttle to provide max air and prevent fuel injectors from operating. The gauge should show a rapid rise in pressure to about 135 psi to 150 psi. record the number and go on to the next cylinder and so on. When you look at the results you want very close numbers for all cylinders. If you have some very low numbers 30 psi or lower than the highest then there is a problem. For the lower psi cylinders put a small amount (teaspoon or less) of oil in the cylinder and crank engine etc and record the reading. If significantly improved then rings problem. Adjacent cylinders with low readings possibly indicate a gasket leaking between those cylinders. Post your results here.

Before buying a new MAF run the car without the MAF since you may get a check engine light don't worry about it. The PCM will in the absence of the MAF use the stored MAPS of air fuel settings. The performance will be the same as with the MAF unless the MAF circuits are problematic. Just a thought.

Good luck.
 

ROLLIN55

Junior Member
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nc
Thread starter #12
wow you have good information to know, i went to auto parts today for my moms car and briefly mention a little about mine, first thing he said was maf, i said i cleaned it already then he stated to test it, un plug it start it up if it stalls or cuts off its not the sensor, if it keeps running then it is. i didnt know how to respond to that i just said ok. when i got home i read your post as well so i did that. it kept running till warmed up with no code turned it off restarted code like you said displayed with the car still running idling and acting up alittle. i turn it off plugged it back in. ill try the compression test next and will follow up on here. thanks again.
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ROLLIN55

Junior Member
6
0
0
nc
Thread starter #13
hello again its been awhile i didnt get the compression test, i wanted to change transmission fluid first since it never been done. i added some lucas additive as well to see if that would make a difference but it didnt. then last week due to bad weather i totaled it. i really like lincoln town cars nice ride will be looking for another one. i enjoyed it even though i had a minor problem. thanks again for your ideas and support.
 
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