LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

Speedometer Reads Slow

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Old 01-06-10, 08:31 PM
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cjmeyer
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Default Speedometer Reads Slow

Having an issue with my 95.For awhile the speedometer was reading high for the first 10 minutes or so.Showing 60 when running 25mph.Now it is the oppossite.It seems to be about showing about 20 miles an hour slower than it is going.
Any advice?
Old 01-06-10, 09:47 PM
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91LS400LEX
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Not sure what it is.

I dont have that problem, HOWEVER my tachometer reads too low... way too low. Sometimes its below 0 when idling if its cold out.

Its gotten worse... I have not seen it above 1800 rpms in months.
Old 01-07-10, 08:50 AM
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Thermactor
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I think that it's probably your gauge cluster, possibly the gauge itself. If it turns out that way, I have a '96 or '97 cluster (minus the fuel gauge) that you can have for fifty bucks. You could yank the gauge out of there and throw it on. That is, if it is the gauge.

I had a fuel gauge that bounced right to the top - the problem was the gauge itself, it had lost its silicone dampening fluid and was looser than (insert relationship reference here)
Old 01-07-10, 10:37 PM
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Twix
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There is a balancing screw on the inner needle end...you can try ajusting it (you need a normal philips screwdriver)...

That is how I calibrated my speedo as it was also reading too low...
Attached Thumbnails Speedometer Reads Slow-balancingscrew.jpg  

Last edited by Twix; 01-07-10 at 10:53 PM.
Old 01-08-10, 10:48 AM
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Thermactor
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Twix, did you ever fix your fuel gauge?
Old 01-08-10, 11:37 AM
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Twix
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Nope
Fuel gauge still works "crazy", doe I read quite a bit and found a few other guys having the same issue...
Unfortunately, the only way they sorted the problem is by buying a new fuel gauge, as the problem is not electronic components on the boards in the cluster, but the needle itself (I'm not sure if it's the mechanism or couple of components that are on the needle base itself)...
Old 01-09-10, 08:09 PM
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cjmeyer
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Originally Posted by Twix
There is a balancing screw on the inner needle end...you can try ajusting it (you need a normal philips screwdriver)...

That is how I calibrated my speedo as it was also reading too low...
Thanks for the advise and great photo.I will give it a shot when I get a chance and let you know how I make out
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