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Join Date: Apr 2016
Posts: 43
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If it us the radio I can handle it as it is not original to the car. The PO installed a Volvo radio??? He took a sharpie pen and colored in the logo and put a Porsche emblem on it. Lol
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04-04-2016, 06:49 PM
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Quote:
For the other stuff make sure to get the alternator checked out. The regulator is integrated and can be replaced. At this point you don't want to do much beyond testing. And yes unfortunately, disconnecting the battery might have aggravated the situation. It acts as load and somewhat tames the alternator output. Once it's out of the circuit the alternator can drive even more voltage into the +12V bus and for the most part electronics suffer. Email me to pcarsba (at) gmail once you have completed your diagnosis and if you need help fixing the DME. Good luck, 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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04-04-2016, 06:54 PM
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Registered User
Join Date: Apr 2016
Posts: 43
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Could it also be the Relay for Injection Pump..?
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04-04-2016, 06:56 PM
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no, the relay is a two-stage relay. The first stage comes on when you turn the key to ON or START. it then powers the second stage input, the DME and the coils and injectors.
The second stage is controlled by the DME. It gets turned on when either the flywheel moves with more than 200RPM or when the starter is energized. It powers the O2 sensor heater and the fuel pump. If you are certain that the fuel pump is running during cranking the DME relay is fine.
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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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04-04-2016, 07:00 PM
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any updates on this?
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04-05-2016, 06:34 PM
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Registered User
Join Date: Apr 2016
Posts: 43
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Sorry for not updating. I am traveling at the moment and it will be the weekend before I can resume working on it. Will update ASAP.
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04-05-2016, 07:50 PM
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Registered User
Join Date: Apr 2016
Posts: 43
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Ok, I had my friend whom has been helping me go over to my house and unplug all the injectors and plug in the Noid attachment. He performed a crank test and NO LIGHT ON THE NOID INSTRUMENT!
Could the voltage regulator issue play a part from this being successful ? |
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04-06-2016, 07:41 AM
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Not likely. Check permanent +12V on one side
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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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04-06-2016, 07:43 AM
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Registered User
Join Date: Apr 2016
Posts: 43
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Also verified that there WAS spark still at the spark plug. If not the voltage regulator we can assume it is the "brain" ?
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04-06-2016, 08:14 AM
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Once you have confirmed +12V at one side of the injector connector and ohmed out the other side to the 35pin connector at the DME (pin 14 or pin 15 depending on which bank)
If both check out it's almost certainly the DME itself. 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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04-06-2016, 08:26 AM
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Registered User
Join Date: Apr 2016
Posts: 43
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Can you elaborate a bit on the ohming out the 35 pin connector ?
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04-08-2016, 02:16 AM
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The injector signal is carried from the DME via the DME harness to the individual injector connectors. On each injector plug one pin is +12V (when ignition is on) and the other pin goes to the DME. One bank goes to pin 14 and the other bank to pin 15. Inside the DME pin 14 and pin 15 are connected to each other and driven by the single injector stage output driver. See here:
 With the DME connected and all injectors unplugged check for +12V on each connector while ignition is ON. Then turn the ignition off, unplug the DME, and measure from the other pin in the injector connector to it's two neighbors with and Ohm meter. It should be close to zero. Same one the other side. Then pick one of the injector connectors and measure from that same pin to pin 14 or pin 15 on the DME connector. One reading again needs to be close to zero.
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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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04-08-2016, 06:25 AM
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1974 Porsche 911 Targa 3.6
