Idle idle or wacky tach? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 12-31-2002, 07:06 PM   #1
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Default Idle idle or wacky tach?

I've got what I think may be a weird anomoly with the tach my '94 SE NA.

It hot idles at 1000 on the tach (my wife'* '98 SE NA hot idles at 750). I was wondering about that disparity so I started comparing the tach readings on both.

Weird thing is that when I turn off the '94, the tach stays at 1000 with the engine off until I switch the ignition back to "on" position again when it drops to about 250.

On my wife'* '98 the tach rests well below the "0" mark whenever the ignition is switched off.

When both are side by side at hot idle they sound and feel the same.

I was wondering if the tach on the '94 is whacked and the 1000 rpm reading is actually 750 plus the 250 offset from when it'* at rest?

If so is there a way to adjust/zero the tach?

BTW, we just got my wife'* '98 back from having the intake manifold replaced for coolant leak and EGR port warpage. Ouch!
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Old 12-31-2002, 07:42 PM   #2
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How much did that repair cost you?
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Old 12-31-2002, 09:07 PM   #3
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Quote:
Originally Posted by 1995BvSSE
How much did that repair cost you?
We had a bunch of stuff done but that part of the bill came to about $800 as far as I can tell.

Any idea about the tach issue?
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Old 01-02-2003, 06:24 AM   #4
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welcom to the club of wacky tachs...mine is by far the worst i think...just pulling out of my driveway im bootin about 4000 rpm [not really but thats what it says ] have yet to either get it fixed or get a different one installed.
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Old 01-30-2003, 09:56 PM   #5
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Years ago, just prior to me installing a new cluster, the SSE showed an idle of about 750 RPM. Because my fuel gauge and oil pressure gauges started going south at the same time I replaced the old cluster with a reman ($110 as I remember). After that I noticed that the 1dle was about 1000 RPM. I'm betting your cluster is goofed up. My 2 cents.
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Old 01-31-2003, 12:03 AM   #6
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Re Wacky Tach:
First check your connector at the back of the cluster. It'* known to loosen off with road vibration.
Second, if you've got a remote start installed, check the Tach Signal wire from the Ign Module. This is the wire that 99% of the people tie into to send a signale to the remote starter module to let it know when the car is running.
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