Yes, all 4 injectors fire at the same time.

Have you established that the problem is fuel-related rather than spark?

> On Apr 26, 2025, at 10:56 AM, Markus Benne <mbenne@M-BASS.COM> wrote:
> 
> Ok, following the digifant tests in Bentley 25.61, there are a couple issues so far.
> 1.   Probably minor - tps when fully open, infinite resistance.  The other ranges are fine.   Would not effect start.
> 2.  Air flow sensor.   Different results w and w/out syndrome wire.   W/out, resistance moves w the changes in the vanes.  With the wire, it doesn't seem to move.  Car didn't start w or without it.
> 3.   This may be something.  Step 5, injectors.   Resistance is infinite between pins 12 and 14.   Resistance on a specific injector does fall in the correct range.  I'm testing this with ignition off.
> Pin 12 is for the injectors, pin 14 is for the digifant control relay.
> Maybe one of the relays is flaky.   Either the fuel pump relay or the control unit relay since they seem to be intertwined.
> I am confused by wiring diagram 97.206 (1990 bus).   Do all injectors fire at the same time?
> 
>