Wedge under-bonnet wiring

[peaktorque]

Still in the process of putting the 'i' back into the 350 (got rid of the Carb's).

The Range Rover EFI system is all fitted and I have re-run the original TVR wiring loom (which had luckily been looped up behind the dash!).

All connectors present and correct. Well except a couple (I think )

Just as the loom exits the bulkhead I have three chopped wires, one thick (ish) black one which is 'earth' I believe and two thin black/white wires. I can't find any reference to them or their duty in either the 'bible' or Range Rover Haynes manual. (I have studied the wiring diagrams )

I also have one other mysterious long black/white wire protruding from the loom by the airflow meter plug.

Strangely I have two wiring connectors sticking out of what I think is the over-run valve, but no wires to plug into them! Or am I missing something?

If you have no idea, but can have a quick look under your bonnet and let me know roughly where they end up, I will be very grateful!

Thanks

James

[Jack Valiant]

I can help with the two wiring connectors by plenem, they are not needed! My 89 350i has them as well (Grey connectors?)

Good luck

Chris

[Roger McLittriss]

peaktorque said:

Still in the process of putting the 'i' back into the 350 (got rid of the Carb's).

The Range Rover EFI system is all fitted and I have re-run the original TVR wiring loom (which had luckily been looped up behind the dash!).

All connectors present and correct. Well except a couple (I think )

Just as the loom exits the bulkhead I have three chopped wires, one thick (ish) black one which is 'earth' I believe and two thin black/white wires. I can't find any reference to them or their duty in either the 'bible' or Range Rover Haynes manual. (I have studied the wiring diagrams )

I also have one other mysterious long black/white wire protruding from the loom by the airflow meter plug.

Strangely I have two wiring connectors sticking out of what I think is the over-run valve, but no wires to plug into them! Or am I missing something?

If you have no idea, but can have a quick look under your bonnet and let me know roughly where they end up, I will be very grateful!

Thanks

James

The long wire from the loom near the airflow meter plug will be the pickup wire that connects to the ignition module to signal the ECU when to inject (needs to be the (-) side of the coil).

The over-run valve has no connectors; do you have a hotwire plenum with the idle stabilisation valve instead?

The thick and two thin wires are all earths for the injection system, they usually go to ring terminals that are secured to a stud on the rear end of the lefthand cylinder head.

HTH

[peaktorque]

Great!

Just the information I needed

Concerning my query with the over-run valve, well, I think I may be wrong.



(sorry about the crap pic.)

This is what I am on about. Two wires and it sits on the O/S of the engine and is vacuum connected.

I have had to take it off to deal with a leaking injector pipe (one thing after another!)

Thanks for help,

James

[Roger McLittriss]

Ah that's easy, don't know why I didn't realise earlier...
Serves you right for ripping the injection off a Range Rover

That's the vacuum switch that operates the over-run fuel shutoff. It feeds a relay that interrupts the trigger wire from the ignition module (confused yet?!) thereby persuading the ECU that the engine has stopped, so it quits injecting fuel. As I recall, it plugs into a pair of white wires from the injection harness at the back of the engine bay. Your car may or may not have the wires, depending on whether TVR were using Range Rover or SD1 harnesses that day

[peaktorque]

Roger McLittriss said:

Ah that's easy, don't know why I didn't realise earlier...
Serves you right for ripping the injection off a Range Rover

That's the vacuum switch that operates the over-run fuel shutoff. It feeds a relay that interrupts the trigger wire from the ignition module (confused yet?!) thereby persuading the ECU that the engine has stopped, so it quits injecting fuel. As I recall, it plugs into a pair of white wires from the injection harness at the back of the engine bay. Your car may or may not have the wires, depending on whether TVR were using Range Rover or SD1 harnesses that day

I see!

No white wires, only the black+white pair I mentioned earlier.

So no over-run shut-off then , does that mean lots of popping and banging on the O/R? (at the expense of fuel )


Thanks again!

James

[peaktorque]

IT RUNS!!! (can't drive it yet as have snapped throttle cable, bald rear tyres and no MOT!)

Thanks for the assistance chaps!

Just this over-run thing I need to sort-out.

Is it actually needed and if it is what would be the best resolution?

1) Modify my existing SD1 wiring to suit the RR set-up. (as it is newer is it better?)

2) Get an SD1 type o/r valve, mechanical?

3) Live without it.

Thanks

James

[TVRleigh_BBWR]

peaktorque said:

Roger McLittriss said:

Ah that's easy, don't know why I didn't realise earlier...
Serves you right for ripping the injection off a Range Rover

That's the vacuum switch that operates the over-run fuel shutoff. It feeds a relay that interrupts the trigger wire from the ignition module (confused yet?!) thereby persuading the ECU that the engine has stopped, so it quits injecting fuel. As I recall, it plugs into a pair of white wires from the injection harness at the back of the engine bay. Your car may or may not have the wires, depending on whether TVR were using Range Rover or SD1 harnesses that day

I see!

No white wires, only the black+white pair I mentioned earlier.

So no over-run shut-off then , does that mean lots of popping and banging on the O/R? (at the expense of fuel )


Thanks again!

James

I have those white black wires and there not connected to anything. 89 400SE.

[Roger McLittriss]

peaktorque said:

IT RUNS!!! (can't drive it yet as have snapped throttle cable, bald rear tyres and no MOT!)

Thanks for the assistance chaps!

Just this over-run thing I need to sort-out.

Is it actually needed and if it is what would be the best resolution?

1) Modify my existing SD1 wiring to suit the RR set-up. (as it is newer is it better?)

2) Get an SD1 type o/r valve, mechanical?

3) Live without it.

Thanks

James

The over-run valve is the bulbous thing on the back of the plenum chamber. That vacuum switch was, to the best of my knowledge, never fitted to the SD1 or any TVR. Chuck it (Don't forget to blank the vacuum port that fed it!)

[peaktorque]

I appear to be missing the 'bulbous' thing!

I would like to add that the engine bay is 'work in progress'!

[Roger McLittriss]

You do indeed

Not to worry; if you can find one, simply knock out the blanking plug, position the o/r valve and drill/tap the plenum to suit

Or live without it!

[peaktorque]

Roger McLittriss said:

You do indeed

Not to worry; if you can find one, simply knock out the blanking plug, position the o/r valve and drill/tap the plenum to suit

Or live without it!

Thanks for your help Roger

Now onto my next problem..........