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Join Date: Jun 2006
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924 Tach
MY 79 924 HAS GONE THROUGH 3 TACHS. WHEN REPLACED IT WORKS FOR ABOUT A DAY AND THEN IS DEAD. ANY THOUGHTS ON THE PROBLEM?
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06-21-2006, 10:51 AM
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The tach gets it's signal from the dist side of the coil. Are all the ignition components stock? Or have you changed any out for high voltage aftermarket items?
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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06-21-2006, 01:39 PM
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Everything is stock.
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76 1/2 924 77 924 Martini 79 924 80 924 Turbo |
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06-21-2006, 01:54 PM
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Check voltages on the coil, it shouldn't be over 12 volts, more likely 11.8 or so. I don't know why but if for some reason it wold be high (I don't know why this would even be though) it might fry the tach.
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06-21-2006, 04:14 PM
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Maybe the top of the coil is cracked and the HV is jumping to the dist side. Check it. How do the points look? Or is this the year they changed to a hall sensor???
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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06-21-2006, 04:44 PM
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if the high voltage was jumping to the dist side that could be potentially dangerous to the motronic computer as the wire also connects there.
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06-21-2006, 07:08 PM
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1983 Porsche 944 2.5 liter
