RPM input to the cluster - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-04-2007, 08:32 PM   #1
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Default RPM input to the cluster

I know this wouldnt be the best way to test if my tach is way off, but I really want to figure out if I have a high idle of 1100 RPM'*, or if the tach is just off. Would it be possible to get a volt reading in the wire to the Tach and compare it to someone elses at closed loop idle? I dont have the money right now to get an RPM multimeter, or buy a tach at a junkyard. Thoughts, opinions, offers to help?
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Old 04-04-2007, 08:39 PM   #2
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I remember this from a good while back... I'm pretty sure you don't have high idle... I'd be more than happy to check for you... But I'm a little far off..

I think the best method would be scantool

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Old 04-04-2007, 08:52 PM   #3
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Quote:
Originally Posted by jr's3800
I remember this from a good while back... I'm pretty sure you don't have high idle... I'd be more than happy to check for you... But I'm a little far off..

I think the best method would be scantool
i do to. if the stupid thing read it I would. Actron left that function out of the 93 H-Bodies for my model. It just bugs me. The PCM has an idle called for 600-700 depending on AC clutch, temp, load, ect...but The tach still doesnt read it.
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Old 04-04-2007, 09:00 PM   #4
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Next time I am at Snadrocks house I'll have to check and see if his 93 has that function on my Actrons

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Old 04-04-2007, 10:46 PM   #5
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well, i dont need to drive the next two days so I started trying to get the harness at the gauge cluster off, and I failed horribly. I Have the cluster loose, except for the wiring harness. Is there screws on the inside holding the black connecter on? I dont want to rip the wires or break anything.
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Old 04-04-2007, 10:51 PM   #6
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nope.. just clips.. put your tilt all the way down, and either get skinnier arms or have your lil sis do it
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Old 04-04-2007, 10:54 PM   #7
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You do have the steering column dropped, right? Otherwise you will play hell getting the cluster out.
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Old 04-04-2007, 10:56 PM   #8
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oh ya, you do have to drop that dont ya.. only need to drop the front mount, and you dont need to take it off, just loosen the bolts halfway
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Old 04-04-2007, 10:58 PM   #9
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now i got it, thanks guys.
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Old 04-05-2007, 04:14 AM   #10
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I confirmed it with math. Calculate your engine RPM from your speed, making sure to take your slip into account if you're in OD. I had the I/P apart for some reason and had to confirm everything as I put it back together.
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