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Try mounts and upper chain guide
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Posted by David Ingram (more from David Ingram) on Fri, 25 Jan 2008 14:00:54 Share Post by Email
In Reply to: 93 Aero, shifter jumps around, jeff, Fri, 25 Jan 2008 12:46:30
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I would first look at the transmission mount, as when these go bad they seem to permit the most pronounced shifter movement. After that check the rest of your motor mounts and replace if needed. At this mileage they're all probably due.

On the rattling chain, 93s were among those affected by crummy balance shaft sprockets. However, just because you're hearing a noise, don't immediately condemn the timing chain (though you may want to steel yourself for this repair if needed).

Often what seems like chain rattle is actually a croaked serpentine belt tensioner. These lose their fluid and make a racket when they're bad. Best way to check would probably be to remove the serpentine belt, and if the shock doesn't fall to pieces before you can start the motor, run the engine to see if the noise is still present.

It still is? Hmm. Probably is chain related. Your next step is to replace the hard rubber chain guide that lives in the underside of the valve cover. Ten bucks and ten minutes. An old one of these will create lots of noise too.

If those things don't quell the noise, then it may be wise to consider addressing the timing chain. Depends how much you spent on the car; even Aeros aren't collossally valuable these days, so you may elect to gamble and hope for a lucky 100,000 miles (it happens regularly!!!).

If you do the chain, don't eliminate the balance shafts. We're talking maybe $75 in additional parts to do this properly and that's all you'd save by leaving them out. With an upgraded sprocket, you're not going to have to worry about those bits again.

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