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greasewagen greasewagen is offline
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Join Date: Sep 2017
Posts: 3
no start no tach bounce. sensor or DME?

Hi all,
new to this forum, but not to these cars. Have had 1 924 and this is my 3rd 944.
This car is a 1985.5 944
Car would run and stall intermittent. Sometimes restart sometimes not. It sat for a week and now it won't restart.
When you crank engine over there is no movement of tachometer.

Battery is decent, charged it over night , has over 12 volt at rest, spins engine over good.
Had spare DME relay. Tried that no luck.

I made a DME relay bypass/jumper and did not start. Does this test bypass the DME itself, ruling it out as bad?

Measured resistance of speed and reference sensors. Getting 900 ohms between pins 8 and 27 on ref sensor, and 880 between pins 25 and 26 on speed sensor. Those seem within spec.
But between 8 and 23 on ref sensor and 25 to 78 on speed sensor I get nothing measurable. Is this normal or do they both seem bad?


Having trouble deciding if the DME or 1 or both sensors are bad. Any info appreciated,
thanks

Old 09-17-2017, 04:40 PM
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