Bypassing the knock box . . .
Hi folks . . .
As many of you know we run a MkII 86ish Jetta GLI. We are currently trying to figure out how to bypass the knock box. So, in theory we believe that we are trying to take the wire that sends the signal from the hall sender to the knock box control and jumper that to the wire (green/white) that runs from the knock box control to the ignition control unit. We thought this should be the red/black wire running into pin position 15, but that did not work. In fact, none of the wires from the hall sender work!!
Also, what voltage do we want running to the ignition control unit after we bypass the knock sensor?
What the heck are we going wrong?
As always, thanks!
DE
Still have problems to solve
Still not there . . .
We used the Bentley diagram on page 79 for 1985-1987 Jetta (except GLI) to bypass the knock sensor control unit by wiring directly from the hall sender to the ignition control unit. The knock sensor is completely disconnected. In addition, we have unplugged the oxygen sensor to put fuel enrichment entirely under our control.
We have good spark, and the car starts immediately. However, as soon as the car burns off the fuel provided by the cold start injector it dies. We have a constant 8V current running to the differential pressure regulator. That current does not seem to change. We have 5 bars of fuel pressure going into the fuel distributor. The fuel system is fine and was not an issue before we started this process. The car is simply not delivering any fuel. We feel like we have messed up the control of the fuel distributor somehow. Any ideas on how to diagnose/solve this problem?
As always, thanks!
Dave