 tachometer question, I'm learning so much about FI and points |
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| brant |
 Apr 4 2004, 12:40 AM
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914 Wizard  Group: Members Posts: 11,951 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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Ok..
I should know this but I don't .... I spent the day getting a car running... not driving, just running on the jack stands... I finally go the wiring sorted out, got the tach working and she starts right up... problem is: at an idle of around 1200rpm.. the tach is reading 2500rpm... WHY? is this a dwell issue or something? I really think I have the wiring straight.. so would it be the tach itself failing? I dunno (I'm so not used to having points and FI.... I'm learning a lot) brant |
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| brant |
Apr 4 2004, 08:35 AM
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914 Wizard Group: Members Posts: 11,951 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains
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good idea about the plug wires...
I don't think it is a multiplication/constant error, when I blip the throttle it seems to work fine but is obviously reading higher than my ears told me was accurate.... the numbers I used were guesses... as the car was at a high idle but reading 2500rpm. The tach worked fine for all of these years and this is my decommisioned race car... Its sat for months now and I've re-installed a street motor (both 4cylinder motors).... The tach has been rebuilt about 10 years ago and always worked flawless.. one thing I molested was that I rebuilt the rear motor wiring harness off of the 12 pin connector... but the tach works so makes me think that the wiring is alright... when the motor is off it drops right down to 0. I'll definitely go look at how close to the plug wires or even coil wire It is that could very likely be one problem thanks for the input rich and all... b |
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