Problem with Rover V8 injectors

[mgwanderer]

Hi there, My engine has the LH bank injectors permanently open as soon as ignition is on (as you can imagine this is quite dangerous). I have disconnected the lambda sensors (no change) when tracing back the signal to open them it is shown at the emu and is permanently present on the pins going to LH injectors. When I change the emu the new unit is the same!!! Any ideas where to go now??
What sensor is only for the LH bank injector signals apart from the Lambda and, can be giving this problem?

All help is gratefully received

Clive

[Steve_D]

Seen this before. The wire that goes to, and is earthed by, the ECU to fire the injectors is shorted. It wears through against the bracket holding the coil.
May not be your issue but in any case that wire is shorted somewhere.

Steve

[DVR V8]

Hi, just looked at my build drawing and hope this helps.

[DVR V8]

Sorry, and the other bit. . Sorry pic is not good so got more info. All the pin 1s at 1,3,5 and 7 injectors are yellow/blue and go to splice which is 60mm from injector plug No7. The main yellow/blue in the splice goes to pin13 at main ECU which triggers injectors. All the pin 2s at injectors 1,3.5 and 7 are orange/brown which go to a splice between injector 7 and 5. The main orange/brown in the splice goes to the main relay [footwell] terminal 87, which also feeds the airflow meter. Hope this helps. Dave.

Edited by DVR V8 on Thursday 31st March 14:10

[Polly Grigora]

Have posted a test procedure for you over @ your technical topic

[blitzracing]

It's quite simple. 12v on on one side on both banks of injectors. Each side is then grounded and fires the 4 injectors on one bank at a time via switching transistors on the ECU. Just unplug the ECU and see if you loose the grounding on the affected bank. If it's still to earth you have a short in the loom. If not its likely a shorted transistor in the ECU. If you can just get a low value ohms to ground then you can move the loom around and see if it clears.

Edited by blitzracing on Friday 1st April 14:36

[eliot]

blitzracing said:

It's quite simple. 12v on on one side on both banks of injectors. Each side is then grounded and fires the 4 injectors on one bank at a time via switching transistors on the ECU. Just unplug the ECU and see if you loose the grounding on the affected bank. If it's still to earth you have a short in the loom. If not its likely a shorted transistor in the ECU. If you can just get a low value ohms to ground then you can move the loom around and see if it clears.

Edited by blitzracing on Friday 1st April 14:36

this.