It's been decades since I tinkered with D-Jet, but doesn't the distributor have an extra set of mechanical contacts below the ignition points plate, for signalling the pump and telling the injectors when to fire?
It was a 1973 450sl v8 I worked on, and I still read about them. Here's how I understand it.
- fuel pump relay can fail intermittently.
- fuel pump should buzz when you first turn the key to the ACC position to pressurize the system.
- fuel pressure is controlled by the fuel pressure regulator on the fuel rail ring.
- cold start injector should give enough gas to get the car cranking when you first start it.
- the "trigger points" in the bottom of the distributor tell the injectors when to fire (not how long, just when). With four trigger points in the v8, two injectors fire at once. With two points in the 6 cyl, three injectors fire at once.
- the duration of the injector opening is controlled by the ECU with inputs from the manifold Pressure Sensor and the throttle position sensor.
- spark is controlled by the ignition points in the top of the dizzy and as the points wear, the dwell will increase and the timing will retard. Many replace the v8 system with pertronix, which apparently isn't available for the six. The pertronix can eliminate or work in conjunction with the switchgear transistorized ignition.
I think that covers the basics.
So what exactly is the problem?
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