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2003 lincoln towncar acceleration knock


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Jason C.
New User

Mar 6, 2021, 2:48 AM

Post #1 of 7 (348 views)
2003 lincoln towncar acceleration knock Sign In

Hi, I own a 2003 lincoln town car with 200,000 miles.The car had been well kept for years and I am currently experiencing a knocking sound when my car accelerates at high rpm.Not sure what The issue is.The car is quiet in idle.My car is silent when moving except when I gas it at high rpm.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Mar 6, 2021, 4:41 AM

Post #2 of 7 (308 views)
Re: 2003 lincoln towncar acceleration knock Sign In

200k says a lot and is enough IMO for this car.
Knock with load of acceleration is controlled automatically, strong guess is a vacuum leak to find and fix will confuse the auto adjustment NOT to knock.


Find those first with a hard look at all hose and gaskets including intake plastic parts by eye. If good on with smoke machines are safest or on to dangerous I'll bring up later.
BTW these cars (extinct now new) are/were so dang quiet an engine could explode you wouldn't notice inside.
It also could have or should have a code reading to get anything 2003 monitors lots if not running perfectly get those if you don't see it easily then let's fix it,


T



Jason C.
New User

Mar 7, 2021, 1:54 AM

Post #3 of 7 (282 views)
Re: 2003 lincoln towncar acceleration knock Sign In

I have done more research and I've seen that if there is engine knock it could be due to using a lower octane Gas? So maybe if I go from 87 to 89 then maybe that would help? Both are unleaded*


Tom Greenleaf
Ultimate Carjunky / Moderator
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Mar 7, 2021, 2:20 AM

Post #4 of 7 (269 views)
Re: 2003 lincoln towncar acceleration knock Sign In

This has a "knock" sensor to adjust to the fuel used. No Town Cars required more than 87 that I know of first Named that in 1980 - before "Town Car" was an option package on Continentals.

Try higher octane or if working it hard sure. Already said it's not adjusting so I would look for vacuum leaks first.

Codes know it's knocking or should so get them read. If nothing comes up it might be mechanical something just sounds like ignition knock?

There's a chance (I don't see this ever anymore) of carbon build up making compression too high or maybe a hot spot of carbon pre-igniting fuel rare to me,

T



Jason C.
New User

Mar 7, 2021, 2:35 AM

Post #5 of 7 (264 views)
Re: 2003 lincoln towncar acceleration knock Sign In

Yeah so my thought process since it's been well over 200,000miles. It's possible there could be build up or preigniting fuel and as the Knocks only happen with acceleration, I may also have to get my sensor checked out even at some point. I am not certain Of all the maintenance history of the vehicle other than what I have had. (Air suspension, brakes, etc;)


(This post was edited by BuriedAlien0 on Mar 7, 2021, 9:12 AM)


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Mar 7, 2021, 4:12 AM

Post #6 of 7 (249 views)
Re: 2003 lincoln towncar acceleration knock Sign In

Another thought on this noise YOU call knock? It might be a heat shield for exhaust. Just look for exhaust manifolds, follow to see them and tap on them (ENGINE COLD) many (assorted vehicles) use spot welds and two piece covers do resist rusting and falling off except where the spot welds are then if enough give out you lose them bottom on whole things! Not funny - they are all over the sides of busy roads. You can also tap with a rubber hammer on tailpipe(s) and cause those to make noise. If you and I am fooled about engine knock exhaust parts could be it.
They could choose just a certain spot of load/acceleration to make a noise, rattle or the noise you hear. If you drive with window open or part open you hear it more.
Already said check for loose stuff underhood and how intake air goes in all those parts intact and tight.
Other notes: These cars are so quite inside you don't usually hear much even if really wrong unless zero use of sound system or device that makes noise.
Check the belts too. Less miles than this may look good but pulleys and rubber belt is shined up can make a crackle sound! If you hear it, hood open, engine running can try spraying water on belt(s) where they ride on pulley and the pulley's groves (engine off) and start if that makes it quit for just minute belts really do make noise NEW ones even.
Miles again: If over doing oil changes and using synthetics these will pass the 200,000 mile mark and be fine lots longer somehow I don't see these or prior engines used really do and be well over 300,000. Not sure why except it's a heavier car and engine works harder still capable of great fuel mileage for the size and weight of them.


Still want you to get a code reading not all places allowed but common to get free ones at major parts outlets and some chain shops. Try to get a printout with the codes NOT just what someone thinks what to do yet if it has one or more,


T








Use of premium could stop real ignition knock isn't likely to solve it.



Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Mar 7, 2021, 5:20 AM

Post #7 of 7 (243 views)
Re: 2003 lincoln towncar acceleration knock Sign In


Quote
more research has said that running it at premium For about a month should get rid of build up and hopefully stop pre igniting fuel. (After knocks are gone you can go back to regular)


I don't know where you read that but there is no truth at all to that. Running premium fuel will do nothing for getting rid of carbon buildup. There are chemicals that can be run through the intake to break that stuff up but that process by itself can cause a whole new set of problems with that stuff breaking off in chunks.



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