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Old 06-07-2012, 03:50 PM   #1
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Unhappy speedo acting like tachometer

having goofy problem with 1995 Itasaca sunrise. the speedometer act like a tach. when in park and rev the engine the speedo reacts. when driving and turn on air spedo goes up 10 mph. any suggestions . thanks Ken
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Old 06-07-2012, 05:17 PM   #2
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I bet you have a Chevrolet P32 chassis with a 454 engine and 4l80e transmission.
I am having the same problem, but if my truck battery is a little down and I start her with the ac on and headlights turned on I am going 40 mph sitting still.
As the battery charges, the speedo gets more accurate. I am lucky enough to work at what was a GM medium duty dealer, so I have picked the brains of the techs. They think is is a chassis ground problem. The speed sensor sends an ac signal to the pcm module that converts it to a dc signal that is sent to the speedo. I am going to ground everything before going any farther. I am also having dash radio problems which may be related since the dash is all plastic.

Safe Travels
Kent
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Old 06-07-2012, 11:03 PM   #3
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sure sounds like a ground problem....try running another ground to the back of the speedo....if possible
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Old 06-08-2012, 10:00 AM   #4
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Quote:
Originally Posted by Old Rocker View Post
I bet you have a Chevrolet P32 chassis with a 454 engine and 4l80e transmission.
I am having the same problem, but if my truck battery is a little down and I start her with the ac on and headlights turned on I am going 40 mph sitting still.
As the battery charges, the speedo gets more accurate. I am lucky enough to work at what was a GM medium duty dealer, so I have picked the brains of the techs. They think is is a chassis ground problem. The speed sensor sends an ac signal to the pcm module that converts it to a dc signal that is sent to the speedo. I am going to ground everything before going any farther. I am also having dash radio problems which may be related since the dash is all plastic.

Safe Travels
Kent
Thanks guys, I have checked all grounds and that fixed the problem.
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