Re-Setting Tachometer
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You Keep What You Kill
Joined: Dec 2006
Posts: 4,902
Likes: 2
From: Huntersville, NC
Re-Setting Tachometer
So I'm driving back home from my parent's house and hit the on-ramp to I85. I put the pedal to the floor just for the fun of it but have to let off because the outside lane was not clear. The guy slows down and I'm running out of road so I put the pedal to the floor again. I make it ok and notice that my tachometer is displaying unusually high RPM's. In fact, it's consistently 1,000 RPM's higher at all speeds. It was really strange to see the higher RPM's yet hear the engine at normal RPM's.
Anyway, when I get home I begin to wonder how I'm going to fix the tachometer. Even with the engine turned off, it's displaying 1,000 RPM's. So I turn the ignition key on but don't start the engine. I then turn the ignition key off. I wait for approximately 15 seconds and the tachometer drops 200 RPM's. I cycle the ignition key again and it drops another 200 RPM's. I had to cycle the ignition key 5 times before the re-setting of the tachometer was complete.
I don't know if anyone else has experienced this issue with your truck but I wanted to post what I believe is the solution. Thanks!
Anyway, when I get home I begin to wonder how I'm going to fix the tachometer. Even with the engine turned off, it's displaying 1,000 RPM's. So I turn the ignition key on but don't start the engine. I then turn the ignition key off. I wait for approximately 15 seconds and the tachometer drops 200 RPM's. I cycle the ignition key again and it drops another 200 RPM's. I had to cycle the ignition key 5 times before the re-setting of the tachometer was complete.
I don't know if anyone else has experienced this issue with your truck but I wanted to post what I believe is the solution. Thanks!
Post Fiend
Joined: May 2006
Posts: 10,007
Likes: 4
From: Central Florida
The 05 might still have the HEC cluster, in which case, hold the trip button down and turn the key on. In a couple of seconds the needles will peg and the odo will read test. If you press the trip button, you will end up with a digital tach. This should calibrate the swing on the tach and you can verify the ECM/cluster is seeing the right speed and just the needle is out of wack.
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