Tip & How-To about Buick Skylark

To install a timing chain on a 1990 Buick Skylark

My Skylark used to make a diesel sounding noise while idling and it turned out to be a worn timing chain which I replaced myself. Some models have a timing gear instead of a timing chain and these can be very noisy as well (2.5 Iron Duke). By 80-90,000 miles you should replace the chain and or the gear set. Before you install your new chain make sure that tensioner is in the box and is compressed with a small metal clip. You will not be able to install the chain unless the tensioner is compressed. There simply won't be enough slack in the chain to reach the cam and crank shafts. While you are replacing the chain be sure to spend a couple of extra bucks and install a new timing cover seal. This seal keeps oil from leaking out of the oil pan behind the harmonic balancer. It is definitely worth the effort to put it in while it is apart.

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2 Answers

Growling engine noise only at idle. Cam area

Take all of the belts off for a short run at idle. If the sound goes away it is pulley related, spin each pulley and listen for bearing noise, also check for play at this time.

If the noise does not go away when the motor is driving no accessories you have a more serious problem.

Jan 13, 2010 | 1991 Oldsmobile 88

1 Answer

Making clicking sounds while idling. goes away while driving. changed tensioner arm fortiming chain. Car started overheating. Changed water pump now sound is back. Mecahic cannot figure out what sound is. Do I need a new timing chain?

u have to check chain for slack if ther is lots slak change if not try to change oil and replace with haver oil and add can lucas u may have lifter noise or worn roker arms

Nov 25, 2009 | 2000 Chrysler Concorde

2 Answers

92 buick skylark 3.3 erratic idle

vacuum leaks, air filter clogged, idle control system, or leaking egr, leaking head gasket, worn timing chain, camshaft lobes worn, valves burnt or leaking, faulty emissions or engine control system.
Could be any of the above. Check your air filter first, then vacuum leaks, the idle control valve sensor. Work your way through them from the cheapest to the expensive. Good luck!

May 15, 2009 | 1992 Volvo 940

3 Answers

When idling my car sounds like a diesel engine, what can that be? also I had the belt to the AC cut cause i dont use the ac where i live! is that ok? will i get better mpg? Thanks!

Your timing chain maybe worn and rubbing the inside of the timing cover and or tensioner. I had this problem and a new chain fixed it. Also it could be your engine has a factory gear drive instead and those are very noisey at idle. The gear drives will shatter after 80,000 miles usually when going at higy speeds.

Apr 28, 2009 | 1990 Buick Skylark

1 Answer

My 1990 nissan sentra has a noisy timing chain when running idle.

Your timing chain tensioner is using oil pressure to stay tight.Could be your oil pressure is so low at idle the tensioner just can't stay tight.At the next oil change you could go for a thicker oil and see if the tensioner keeps the chain tighter at idle.

May 05, 2017 | 1990 Nissan Sentra

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