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seanoswald@earthlink.net
New User
Sep 22, 2008, 8:58 PM
Post #1 of 2
(1463 views)
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knocking and pinging
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I have a 1991 lincoln town car, V8 with 55,000. My car knock when it shifts into a new gear and on hills. Super unleaded has helped, but what else can I do>
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Sep 27, 2008, 9:31 AM
Post #2 of 2
(1452 views)
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Re: knocking and pinging
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Is this like a ping/knock - as in "detonation"/"preingnition" and assorted terms for spark knock? With the low miles it may have spent lots of time just poking around, idle speed or whatever and have compression too high from carbon build up.
You may see evidence on a spark plug of this condition. It was common back with leaded gasoline back when and a good hard run usually cleared it out.
I'm guessing based on the age and miles that this is a possibility. They do have carbon cleaner that is put down throttle body which can help or quickly remove carbon build up. It's tricky doing that properly and you might want to just drive aggressively in a safe place where you can "pedal to the metal" a few times allowing first gear to run to max (in mormal drive so it will shift to second) by full accelleration - glance in rear view for a cloud of dust as evidence that this is the likely problem.
There are also "carbon cleaners" that you use as an additive in the fuel I've seen but not tried myself. Those may take some time.
Use all caution if you are going to run it hard from slow or a stop - like a low/no traffic highway and if you aren't up to that get someone who can for you. I'm just suggesting full throttle take offs up to legal speed limits in a safe place,
T
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