Question about 2002 Cadillac Sts

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I was driving my 2002 Cadillac STS when it started to knock suddenly. Only does it when accelerating, but not neutral or park. Sounds similar to a coke can in a bicycle tire spoke

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  • 38 Answers

This, to me, sounds like worn crankshaft bearings, only it's not bad enough yet to cause you to hear them in a non-stressed/non-load situation (as in when in park or neutral)

the solution to fix this varies and is not very appealing!

Posted on Nov 08, 2014

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Put in a fuel injector cleaner such as Lucas. Use a higher octane gas. 91 or more. After a couple of tank fulls the Knocking should go away unless you somehow bent a pushhrod. Did you replace your timing belt/chain recently??
If not use a higher octane fuel

Posted on Nov 08, 2014

  • Anthony Fancher Nov 08, 2014

    No haven't replaced timing chain. Could it be the oil pump? I was told that could be problem. Also it doesn't sound like it should be driven especially to go through 2 tanks of gas.

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: engine or transmission knock / rattle upon

I had the same problem on my 2006 Lucerne and it was the engine mount located on the front of the vehicle behind the radiator.

Posted on Aug 24, 2009

wracefans24
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SOURCE: 2002 Dodge Grand Caravan, 69k miles, vibration at idle in D and R

if what your feeling is not an engine miss,
then it will be a motor mount,best chances are the front center one,,
or top trans mount

Posted on Dec 02, 2009

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1 Answer

Why wont my cadiilac 2002 sts move in any gear?


I hate to be the bearer of bad news but sounds like your transmission has gone out. But shifting to park and no motion is an acceptable behavior:)
One other possibility is the linkage to the transmission has broken and you are not actually shifting gears when moving the shifter.

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What do you mean it doesn't accelerate? Will it accelerate at all, like gradually build up speed when driving? Or do you mean it doesn't drive at all? Does it rev while in neutral/park or out of gear?

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The speedometer and odometer gets a signal from the speed sensor in the side of the transmission where the speedo cable once was.
The problem could be the speed sensor, or something in the wiring, or in the instrument cluster. Or it could be that the transmission is failing internally.

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So i have a cadillac STS when i start it up its like it is accelerating on its own without stepping on the the gas but what i am concern is when i place the car in drive D it knocks really bad a loud sound...


Sounds like a vacuum leak. this will affect the idle causing it to idle high but with no power (at idle) so almost dies at idle in drive, (under resistance) The knocking is likely your exhaust pipe shaking and hitting under car, cos of the engine shake.
Look for a vacuum tube hanging loose from around the intake area. Maybe trim off stretched end and reattach. May be able to hear it with engine running.

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Sounds like it may be a faulty Crankshaft Position Sensor...had the same problem with a Chrysler LHS once.

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Did this suddenly start on it's own or after some repairs? Sounds like it's somehow getting power through the neutral safely switch, very odd.

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