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No Spark on my '85 - HElP
I have no spark on my '85 911. I have pulled plug and grounded against engine and nothing. I checked primary resistance (1-15) on coil and it is .6 ohms, secondary (15-4) is 5700 ohms. (These are in line with what I checked on my sons '87 944 (same coil) - I even swapped them out. I also have 12V into #15.
What next? Thanks Trey |
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03-22-2009, 02:36 PM
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Autobahn Garage
Join Date: Jun 2003
Location: Ohio
Posts: 1,546
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DME relay, or engine speed sensor is my next guess
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T Tanner 76, 911s w/ Webers 76, 914/4 57, Speedster |
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03-22-2009, 02:40 PM
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The DME relay is new, and the speed senson has good resistance (to spec). Any other ideas?
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03-22-2009, 02:54 PM
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Do a search - this topic gets covered about every other week. First check if you get power to the DME with the key to ON (vibrating ICV), next check if you have +12 volts at the coil with the ignition to ON. If the sensors are good (oscilloscope) check if you get fuel injector pulses during cranking (LED test light). If no, sensors or DME are suspect, if yes you either have a bad coil, bad distributor or a bad DME.
Ingo
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1974 Targa 3.6, 2001 C4 (sold), 2019 GT3RS, 2000 ML430 I repair/rebuild Bosch CDI Boxes and Porsche Motronic DMEs Porsche "Hammer" or Porsche PST2, PIWIS III - I can help!! How about a NoBadDays DualChip for 964 or '95 993 |
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03-22-2009, 04:15 PM
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Registered
Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
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On my car it was the coil and or the coil wire. When you pulled off the coil wire, you could see it had burned trough.
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03-22-2009, 05:17 PM
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Totaled by illegal, uninsured, drunk, hit and run
Fair Weather
Interim Daily Driver - For Sale Soon
New Daily Driver
1974 Porsche 911 Targa 3.6
