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View Full Version : 1998 Sierra clattering while accelerating



threepoint14
01-03-2015, 18:38
1998 Sierra, 168K, new fuel + air filters, new glow plugs.

Truck idles relatively smoothly, but clatters loudly with gentle acceleration. No black smoke, not stumbling, not stalling. Runs delightfully reliably, starts consistently if not easily.

It's still accelerating relatively smoothly, and the clatter quiets when the turbo kicks in. It gets a consistent 17MPG.

I'm only slightly mechanically inclined, still learning. I'm hesitant to take it to a shop because they'll almost certainly say it's the fuel injector pump, and the issues started 1600 miles ago... Doesn't sound like IP dies slowly for the most part.

threepoint14
01-03-2015, 21:44
Oh - Sierra 3500, if that matters.

phantom309
01-04-2015, 21:37
Put a socket on the alternator nut,. see if you can move the alternator and the belt back and forth about a 1/4 turn quite easily,

IF you can,. the balancer has failed,.

john8662
01-07-2015, 11:34
he means check the crank pulley, not balancer.

phantom309
01-07-2015, 19:21
he means check the crank pulley, not balancer.

Doh!!

yes he's right,. i should have said crank pulley,.i changed mine last year when the alternator seized up burnt the belt off and ruined the crank pulley,.

sorry,.,.