1996 Jumpy Tachometer

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1996 Jumpy Tachometer

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Chevrolet Forum >> Chevy Trucks, Vans & SUV's >> Suburban >> 1996 Jumpy Tachometer

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1996 Jumpy Tachometer - 10/31/2007 5:35:54 AM

Rivernut

Posts: 25
Joined: 10/31/2007
Status: offline

Hi, I'm new to this forum. I just bought a 1996 Suburban with 226,000 miles on it. It has the 5.7 vortec gas engine in it. I have owned other Chevy full size stuff in the past, but this is the latest model I've owned. It runs well, but the tachometer jumps all over, especially when accelerating. Yesterday after driving it about 40 miles, the tach stopped completely. There are no other symptoms, it idles smooth and has great acceleration. No ignition misses or codes. I did install a beefy ground wire to the engine, but that did not help with the tach problem. Where is the tach lead on these? Does it plug into the distributer like the old HEI ones? What color wire? Also, how many miles are people getting out of these Vortec engines when maintained?

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RE: 1996 Jumpy Tachometer - 10/31/2007 10:39:30 AM

ZX1100F1

Posts: 2429
Joined: 8/1/2006
Status: offline

Probably need to replace the tach stepper motor inside the cluster.

Most people are getting 226,000 miles out of the 96 Vortec 350 mills before they require an overhaul.

(in reply to Rivernut)

Post #: 2

RE: 1996 Jumpy Tachometer - 11/1/2007 5:14:09 AM

Rivernut

Posts: 25
Joined: 10/31/2007
Status: offline

If it is not a loose wire, I have read that it could be caused by a short or open ignition circuit such as a loose or defective plug wire, bad distributer cap, carbon tracking in a cap, or a bad tach. Can just the tach be relaced? SOme people have told me the tach problem on my Suburban is very common on GM trucks of that vintage.

(in reply to ZX1100F1)

Post #: 3