Question about 2003 Oldsmobile Silhouette

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I press the gas from a complete stop and sometimes the engine will rev without the van moving until for a second or two the hear a small bang and van is fine...doesn't hardly happen but it does and would like to correct Thanks PC

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Sounds like the Automatic Transmission "lock-up". If you haven't changed your filter and fluid in a while do that. There are some good additives to help the transmissions when they get old. Lucas was one I used. My APV got so hot in Palm Springs, CA I had to go in and get some additive before it would move. I loosened the line to the radiator to get a little fluid out and eventually went to a add-on cooling radiator, like you would for a towing vehicle. It seemed to quiet all the noises.
The vacuum modulator went out an other time - but that prevented the car from shifting up to second.

Posted on Oct 24, 2010

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Posted on Jan 02, 2017

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When i put my 2004 f150 fx4 truck into reverse and or drive there is a knocking and or shuttering sound, only while idling. When i start to give gas and move noise stops completely. everything else works...


Sounds like a bad U-Joint.

On this particular truck this is bad news.. unless someone has already replaced the factory ones once.. as the factory ones are pressed in you may need a special tool to get the old ones out.

A driveline shop may be able to do this for you.. and check with the Ford dealer for their repair procedure.. many folks have simply had to replace the entire drive shaft with new U joints.

They will be aware of the issue.. have them check service bulletins etc.

You can have someone check the location of the noise by keeping your foot on the brake.. placing the truck in gear.. and giveing it a little gas.. putting strain on the drive train.. shifting back and forth.. rolling a foot or so.. repeat.

The other things to check.. Motor mounts.. and transmission mounts..

Motor mount.. simply observe the engine with hood open.. and rev it up a little.

Best of luck!

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Sounds a whole lot like something inside the trans has failed...Time for a trip to the trans shop!!!1
sorry to hear that!!! Warning light came on and usually will set a code that indicates mismatch of speed & rpm.

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