ODMETER PROBLEM, PLEASE HELP! - Page 3 - 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 06-23-2006, 11:21 PM   #21
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Quote:
Originally Posted by Technical Ted
Maybe the original poster can give us some more info. Do we all agree that changing to those tires wouldn't change the speedo by more than 10%?
Yes. The first number is the only one that we need to worry about. 10 is not nearly enough to make that sort of difference
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Old 06-24-2006, 01:17 AM   #22
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I smell a Canadian car or at least a replacement canuck cluster.
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Old 06-24-2006, 01:24 AM   #23
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That'* the only thing I could think of...I think he'* leaving out some important information.. Maybe he doesn't even KNOW he has a Canadian cluster. "Hey look I'm going 170mph!"
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Old 06-24-2006, 05:51 PM   #24
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it'* me with the speedometer that'* off, my dad bought the car new in 1996, the speedometer is in mph, one day i was driving down my street and the cops had set up one of those radar diplay trailors that tell you how fast you going.....so i made sure my speedo was at exactly 30mph and the radar said 17mph, there was no other cars around to confuse the reading with either.

me and insane lss also did a test where he drove next to me at 45mph and my speedo said like 60mph, so i have no idea what is going on

also my dad has sworn since the day he bought the car that the speedo was 5mph off, but we never confirmed that.
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Old 06-24-2006, 08:13 PM   #25
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is it possible that at the factory the put in a kph computer or sumthing and even though my gauges are ment to read mph they read in kph? also does the odometer go off of the mph or does it take a seperate mesurment of distance
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Old 06-24-2006, 11:48 PM   #26
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Well you're saying your dad swore the speedo was off by 5, but you're saying it'* now off by 13. I was actually going to ask how you knew your speedo was off, and if you were driving by a radar like that.

I'd find it hard to believe that anything went wrong when the car was built, but the speedometer moves exactly the same in an American car as in a Canadian car since both sets of numbers are on the speedo. It'* not like the new speedos that have one set of numbers and the needle can change position drastically when you switch back and forth between mph and kmh. Your speedo reads in both mph AND kmh, not one or the other...it just depends on what set of numbers you're looking at.

I hope you get what I'm trying to say. In other words, the only difference I would think, between a Canadian cluster and American, would be that kmh are the top set of numbers (and the other gauges like temp, oil pressure, and boost, if you're lucky, are in metric). And of course the odometer. There'* no kmh computer in the speedometer. Can anyone else confirm what I'm trying to explain. This thread is like the twilight zone I hope I'm making sense.

I don't know what'* up. When you were driving 30mph and the radar said 17, did it FEEL like you were driving 30, or 17? Because that'* a big difference and you should be able to tell if your speedo was right and the radar was wrong.
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Old 06-25-2006, 04:35 AM   #27
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Well, when he'* driving and I'm in his car, sometimes it feels like we're barely moving, like we're going 33 mph in a 35 zone. Then I look at his speedo to see how fast were going so that I can tell him I'd like to make it there today, not tommrow, but it'll be reading 48-50 mph.

Or if I'm driving behind him, he consistantly goes under the speed limit by 2-5 mph, and when I ask him how fast he was going, he'll say his speedometer was reading 5-10 over the limit.

One time he was in a 45 and I was behind him, and I swear he was crawling, and I was a little annoyed he was going so slow, but he told me his speedometer said he was going 60 and he didn't want to go any faster.

I think a GPS would be a good idea, but I don't know anyone with a GPS unit (I'll have to ask around), and they're not cheep. Maybe we'll just have to pick a late night and get going right next to each other on a 4 lane road and compare speedometer readings between our cars to be sure how far off his speedometer is at different speeds.
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Old 06-25-2006, 08:57 AM   #28
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maybe get a scantool and see what the PCM is reading off the VSS, the cluster may be wacked
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Old 06-25-2006, 10:20 AM   #29
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Quote:
Originally Posted by 1993 SLE
maybe get a scantool and see what the PCM is reading off the VSS, the cluster may be wacked

Sounds like a great idea. I'd pull the VSS (vehicle speed sensor) & clean any crud off it. Also check the wiring connectoins at the sensor.
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Old 06-25-2006, 10:03 PM   #30
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Quote:
Originally Posted by 1993 SLE
maybe get a scantool and see what the PCM is reading off the VSS, the cluster may be wacked
I thought about doing that for him, but then I thought, the speedometer reads what the computer sees, so what would be the differance? It'* pointless.

But, I guess that'll check the integrity of the cluster. One more thing to do.
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