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Registered
Join Date: Mar 2019
Location: Saarland, Germany
Posts: 1,246
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Quote:
Originally Posted by Tori
-I've verified i have power at DME relay on both pins, 86 and 30 (30 when ign. on)
-I've swapped coils with another Bosch coil (not 100% positive it's a good coil, but it's what i had. I do have 12v at coil.
-Checked ohm readings of speed and ref. signal sensors. 971k and 973k respectively.
-Pulled dist. cap to inspect, rotor looks fine, cap has normal buildup and does show wear on a few of the terminals - looks like rotor contacted a terminal at some point, but nothing looks excessive or beyond it being able to function. (at least to some degree). - I'll order new cap and rotor for later this week.
I'll pull the DME apart next and look for failed solder joints next.
Open to any other suggestions.
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Sorry to say, but your tests are not appropriate. You cannot rely on simple voltage measurements of the DME relay. It's contacts corrode, and they fail more likely when heat (after driving some time) or vibrations rather than being cold with a sitting engine...
Tinker a three wire cable by yourself as I linked earlier, as this creates a solid and permanent connection between the contacts instead of errorprone switched contacts.
Your Ohm readings on both speed and reference sensors are not correct, the numbers you want to read is approx. 0.6 - 1.6 kOhms each. Not 970kOhms!! If the sensors really got these numbers, ther're crapped and have to be replaced! Place the test probes at the plug of each sensor directly! Otherwise you probably measure everything else but the sensors.
Visual inspection on ignition parts is senseless without electrical check. You want to read 4-6kOhms on each wire from plug to rotor cap. The rotor itself for the 3.2 Carrera has 1kOhms resistance. Wiggle the cables too while measuring to rule out broken cables.
Thomas
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1981 911 SC Coupé, platinum met. (former tin (zinc) metallic), Bilstein shocks, 915/61,930/16,WebCam20/21, Dansk 92.502SD,123ignition distributor with Permatune box as amplifier,Seine Systems Gate Shift Kit,Momo Prototipo. Want to get in touch with former owners of the car. Last registration in US was in 2013 in Lincolnshire/lL.
Last edited by Schulisco; 12-09-2025 at 05:08 AM..
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