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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 04-02-2003, 12:29 AM   #1
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Default Funky Tachometer

Today i had to briskly accellerate to 60 mph to get in front of a car, and when I got to 60-65 my tach was dropping at rhythmic intervals when i was not pushing the pedal to correspond. It varied maybe about 500 rpms, and when I totally let off the gas for a sec it went away. I put on the cruise after that and it didnt move erratically either. I think that it is something with our transmission and my dad thinks that it is a problem with our fuel system. I drive a 1997 SE with about 137k miles on it, mostly highway driving. The car still drives fine, but I want to possibly nip this problem in the bud and stop something more serious from going wrong.
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Old 04-02-2003, 03:19 PM   #2
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Default Re: Funky Tachometer

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Originally Posted by macho_mike21
Today i had to briskly accellerate to 60 mph to get in front of a car, and when I got to 60-65 my tach was dropping at rhythmic intervals when i was not pushing the pedal to correspond. It varied maybe about 500 rpms, and when I totally let off the gas for a sec it went away. I put on the cruise after that and it didnt move erratically either. I think that it is something with our transmission and my dad thinks that it is a problem with our fuel system. I drive a 1997 SE with about 137k miles on it, mostly highway driving. The car still drives fine, but I want to possibly nip this problem in the bud and stop something more serious from going wrong.
Just so we're clear on this, do you have _any_ symptoms beyond a wonky tach needle?You've been saying that the needle is dropping but the car runs fine. How do you conclude that there is either a transmission or fuel problem here? I'm confused...
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Old 04-03-2003, 12:52 AM   #3
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ok, i just wanted to make sure that this wouldnt blow up in my face, the trans thing was just a guess, I reall have no idea.
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Old 04-03-2003, 11:31 AM   #4
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Originally Posted by macho_mike21
ok, i just wanted to make sure that this wouldnt blow up in my face, the trans thing was just a guess, I reall have no idea.
Might be an idea to see if the coil pack connections are clean and tight; I believe the tach input originates down there.
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Old 04-03-2003, 12:32 PM   #5
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Originally Posted by jr's3800
Yes it sure does... That would be a good place to check... One bolt, just make sure the connection is tight... I forget which wire is for the tach...
Har! Yeah, I'm sure you've forgotten; we had only eighty-six postings about it!

(For everyone else: It'* the fifth wire from the right, a white one sitting in between two darkish ones; i.e. with the connector wires lettered from right to left -- F-E-D-C-B-A -- the tach input is wire E.)
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