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Old 02-01-2005, 02:12 AM   #1
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Default Autotapped the LTZ

So my friend and I were heading to dinner with my dad an hour away and decided to hook it up to an AutoTap we borrowed from another friend. We ran it for about 20 minutes on the highway and verything seemed ok. Mileage was within 1.5 miles of the speedo, RPMs were showing 100 more on the car'* tach, Fuel gauge worked and I am throwing no codes. The temp gauge was off though, reading 140 deg rather then what the car was running at, which was 194 deg. This, and checking codes and speedo were my reasons for trying the autotap. Now mind you the car had 140, 723 miles on it. I checked engine torque, which when I was on WOT, read 360+, which seemed very odd to me. We checked it again and found that it was a fluke error and the max had actually only got to 247, which seemed slightly high to me. The other thing that struck me as odd was that we checked the mileage in the computer and it was 140,480 Now... that is 243 mile difference from what it is actually reading. Anyone know how this would occur? I am almost certain that the engine is original (bought it with 95k) I might be going around tomorrow and trying out some other things... Also, KR was 6 deg at WOT. Good or bad?
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Old 02-01-2005, 02:20 AM   #2
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Maybe I'm a little confused:

"Mileage was within 1.5 miles of the speedo"

You mean MPH? It may be that the there'* two separate things keeping track here. One being the PCM along with whatever sensor its reading off. The other being a factor of the speedometer and time, which is displayed on the dash. Since they're 1.5mph off (?) maybe over the course of 140,000miles+ it would add up to 243miles...? I dunno just a thought.

Might wanna get that temp sensor replaced, prolly worth a few issues.
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Old 02-01-2005, 08:32 AM   #3
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i think he means MPH
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Old 02-02-2005, 02:50 AM   #4
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yeah... sorry for the confusion. I meant MPH. The speedometer shows 75 and the PCM reads 74. Also, the mileage is kinda funny, but you might be right with it being off cause the speedometer is. I am not sure if the odometer on the car runs off the speedo or the PCM.

As for the Thermostat, I know it is correct cause I just had it replaced when it went bad. And it reads correct in the PCM. The only issue is the gauge cluster doesn't display it properly, which might have been caused by the old thermostat going bad. Not sure, but atleast I kno the temp is correct.
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