Question about 2006 Cadillac STS

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I have 67k on my sts and im hearing what sounds like a sloppy timing chain chattering from the right side of the engine as im sitting in the drivers seat. Im aware that there are 3 chains in this motor and that it is also an interference engine . No engine lite on and no other trouble lites on as well . IS THIS POSSIBLE AT 67K??? Mark.........

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Yes, it is possible. Most probable cause is a timing chain guide that is broken or the hydraulic chain tensioner is bad. No way to tell without going into engine. Unfortunately Northstars are not fun for the novice, or even slightly motivated weekend mechanic to tackle.

Posted on Nov 09, 2010

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I have a loud tapping noise when im driving,it does not sound like a lifter, good it be a timing chain slapping?


usually it is the rings from piston to cam that cause a loud chatter similar to a lifter tic on 4 cyl olny

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Loud chatter on start and rattle from timing chain area


The timing chain area also takes in the alternator and water pump. To isolate the source of the noise, use the old mechanics trick.

Place a 3 foot 1/4 inch brass rod against the flap at the opening of your ear and push until it closes. Place the other end of the rod against various engine components and listen. The noisy problem will conduct the noise up the rod to your ear and you can hear quite precisely where the problem is. Much safer than laying your ear all over a running engine.

You can also loosen the fan belt and run the engine without alternator or water pump (briefly) to see how that affects the problem. Chatter on start makes me think of starter and Bendix gear problems. Sounds like a 2 person diagnostic team to me; one to start the car and one to listen and probe.

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I checked out the pajero forum, they don't mention the bottom tensioner as being the noise maker here but rather a sloppy chain, stretched beyond the tensioner and riding on the guides. The noise sounds like it comes from the fan area as a metallic chattering. They sell a chain that has a master link in it, and you don't have to tear down the entire engine again to get to it, just the top cover,, Cut the old chain, and use it to pull the new one through. Also, if your chain did jump its gear, it would only be a matter of 8 - 10 miles before the cam breaks. Hope this helps.

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1 Answer

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Any abnormal noise coming from the engine needs to be investigated dealt with before it causes you extra problems and expense. If you have a worn and sloppy timing chain it will effect your valve timing and ignition timing and can possibly skip a tooth and then run really roughly so that could be your problem. But you say you have two cylinders not firing right, with the timing chain they would all be bad so it could be something else. With the engine idling take off one plug lead at a time and note the change in engine sound. If no change this is a the bad cylinder. If the two bad cylinders are adjacent you may have a blown head gasket (look for a milky residue in the oil, foaming in the radiator and overheating). Once you have tried this report back with your results and you can get more help.

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