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1965 Superformance 427 Cobra, & 2022 BMW M850
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Depending on how much time you have to devote to this you might want to look at an aftermarket ECU like an MS3Pro PnP or MS3Pro EVO <= clickable. They will start the engine, run the engine and get you away from the problem pit you are currently stuck in. If you use one of the PnP units you can use a factory wiring harness. The MS3Pro PnP supports variable cam timing on as many as four cams so you can keep the VCT feature the engine already has.

Ed
 

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Discussion Starter · #42 ·
Has anybody on here successfully swapped a 3v into something else using the stock PCM/Harness, or a Ron Francis? I am at a loss of what to try next. Could there be something in the cluster/BCM/PATS/other modules that the PCM needs to see?

After doing some more research, unplugging both cam sensors puts it into some sort of "failure" mode and will then fire the injectors and spark on both cycles, thus why it will run for a couple seconds but has a bit of a misfire. Also to note, with the cam sensors unplugged, I can press the gas pedal and get a response (engine revs like it should). It still shuts off after about three seconds though.

with the cam sensors plugged in, it will only run for about a half second, and has no response to the throttle pedal.
Finally, here it is giving it some throttle with the cam sensors unplugged
There is a guy that put one in a ford ranger and he used Ron Francis wiring harness.

Why is it that when you make it go into a default mode by unplugging a sensor it will run longer? It makes no sense. It's like there is maybe a wiring piece missing? It's almost like the key gets shut off or the timing table is confused.

The cam sensors control PWM for the injectors, if I remember correctly. So why do we lose the injector pulse? The injectors are 12V constant and the ground is controlled by the ECM, so where is the break down?

BTW glad to hear you got your refund.

D
 

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1965 Superformance 427 Cobra, & 2022 BMW M850
Joined
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9,477 Posts
Injector pulse width is always modulated by the ECM. The cam sensors report to the ECM the cam position for the variable cam positioning messaging to the cam phasers, which is also exclusively handled by the ECM.


Ed
 
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