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Join Date: Dec 2022
Posts: 30
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3.2 swap issues…
Swapping a 89 3.2 motor into a 1980 911SC
Having a no start issue. No fuel pump (works when connect old wire used in SC setup), no spark, no RPM bounce when cranking Where I’m at. 1) New DME Relay 2) swapped both speed and ref sensors for new No change. -No spark and no fuel pulses to injectors when cranking when tested with meter. -ICV vibrates when key on, so harness at least getting power At this point I’m thinking it’s either the DME itself, or I am dumb and wired something wrong. So before I shell out some cash for a new DME if any guru’s can review my wiring to tell me if I’m missing something. Changed the wiring in the 14 pin connectors, but those should have no bearing on this. Last edited by Cozmos; 12-13-2025 at 10:33 AM.. |
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12-06-2025, 05:53 PM
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Posts: 30
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Bump!
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12-07-2025, 06:50 PM
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Did you remove the distributor? Could it be 180 out? Are the fuel lines reversed? Check the fuel pressure. Get a Bentley 3.2 manual, it has a nice troubleshooting section.
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Steve 75 914-6GT clone with a 1995 3.6 DME motor, 915 trans with Martin Bott 916 shift kit, MB911 heat exchangers, boxster brakes, etc... Special thanks to Patrick Motorsports for fixing my 915/916 trans and there associated 3.6 conversion parts. |
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12-10-2025, 08:53 AM
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Here is the diagram that I used for my 914. As far as I know you also need a starter connection to the ignition switch.
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Steve 75 914-6GT clone with a 1995 3.6 DME motor, 915 trans with Martin Bott 916 shift kit, MB911 heat exchangers, boxster brakes, etc... Special thanks to Patrick Motorsports for fixing my 915/916 trans and there associated 3.6 conversion parts. |
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12-10-2025, 09:02 AM
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Flat Six
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I'm assuming you're using a 3.2 flywheel with the studs/pins to trigger the speed & reference sensors? Also, someone here (I think it may have been John Walker) reported a new replacement flywheel he installed had studs/pins made of stainless steel -- looked right but wouldn't/couldn't trigger the sensor.
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Dale 1985 Carrera 3.2 -- SOLD 2026 Jaguar F-Pace / 2025 Ford Bronco Sport |
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12-10-2025, 01:20 PM
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Join Date: May 2008
Location: Grapevine, TX
Posts: 1,115
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Also, could you have possibly crossed the connections for the speed and Ref sensors? they are the same sensors and connectors, so it would be easy to accidently connect the speed to ref and ref to speed connectors at the harness.
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12-12-2025, 08:30 AM
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Join Date: Dec 2022
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Thanks for the input everyone. Went through everything again yesterday with a helper, and the Bus in the fuse box I connected to was not getting cranking power. Should have started there but followed too closely a write for up a 3.2 swap to an older model which has a different order. This is why everything was getting power when testing, but when cranking no spark, DME power was being cut.
So after cranking and checking all the terminals with a meter for switched AND cranking 12V had success and all is up and running! Last edited by Cozmos; 12-13-2025 at 10:35 AM.. |
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12-13-2025, 10:33 AM
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Congrats!
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Steve 75 914-6GT clone with a 1995 3.6 DME motor, 915 trans with Martin Bott 916 shift kit, MB911 heat exchangers, boxster brakes, etc... Special thanks to Patrick Motorsports for fixing my 915/916 trans and there associated 3.6 conversion parts. |
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12-13-2025, 04:04 PM
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1975 Porsche 914-6 84 Euro 3.2
1985 Porsche Carrera
