Porsche 924s
10-25-2014, 05:27 PM
#1
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Porsche 924s
So today I have checked a lot of electrical on my Porsche 924s. I have found that I do not have a ground to my coil which is not grounding my plugs, also I have no ground to my injectors. I have positive, but no ground at ignition on either. Could this be as simple as a bad ECU? I have replaced the ref. and speed sensor, put in a new DME relay. I have checked all fuses and they seem fine, no breaks. What am I missing to get this car to start? I’m thinking it’s the ECU, but I would like your input. Thanks Matthew.
11-04-2014, 01:12 AM
#2
Although I have zero experience with Porsche's I am experienced with other cars and sometimes a fuse might look good and even work on occasion but not really work good consistently. I would change out the fuses for good measure.
11-04-2014, 03:52 PM
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Rainman
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The ECU switches the ground of the ignition coil when it wants to fire the plugs.
So if the DME is not running the car there isn't a ground. The +12v is hot with ignition switch.
So if the DME is not running the car there isn't a ground. The +12v is hot with ignition switch.
11-08-2014, 09:01 PM
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Has anyone else changed the harness side of the reference connectors before? To my amazement there is a shielded wire wrapping them that becomes a wire with an open barrel terminals. What do you guys use to disconnect the terminals from the connectors? I’m going to finish a few things before putting in the new ECU I purchased off EBay for $225.