I have a horrible feeling of De-Ja-Vue at the moment!

OK, my Car was away getting a bespoke exhaust made a couple of months ago, and prior to this it would start fine.

Since I had it back, I have concentrated on taking the engine and all that good stuff out to redo the bulkhead and check everything possible for IVA.

All is back now, and fitted, looking nice and pristine-like!

Then I got to testing the engine ciruit - ign on, and...

... the LP pump starts - CHECK
... Throttle Blade Clunks - CHECK
... HP Pump? ...Hey! Where are youuu? ..where's that 5 second burst to build the presuuuuuure? - GADAYAM! Not a peep!

... So for two nights I have been up to my arm-pits in wiring, tracing tracing....and found this so far:

HP pump will work if connected to LP pump relay to test - so the engine side and pumps are OK
Feed to the relay ... +ve good as is ground, and all wires secure and in correct place.
The HP Pump relay is fed to pin 85 from a + feed (12v) from the ECU Pin 50 (from memory) - none of this has been disturbed.
Checked continuity from Pin 50 on Plug to relay - (good)
When ign switched on...no momentary +ve feed from pin 50 at all - Nothing! No voltage, Nada!

How the heck can this happen to me?

Any ideas before I take an axe to the whole thing?

I guess the only way of telling if the ECU has gone awol is to try to find someone who can plug and test? (this is the second damn one - first was faulty from supply - but this one was working...)

Who can do this for me quickly? Any one know?

Any help would be appreciated....before I lose my mind!

Cheers

It does sound like the ECU is not sending a feed so is faulty.

Can you get hold of another to try?


Paul

Keith, try and hangle Mark to lend you his ECU as I believe he is down the road from you...

Typical Mark! your so o-b-t-u-s-e ain'tcha! Thanks all the same old chap... and YES, it IS likely you will beat me to IVA the way things are panning out for me!



Mr D - this is showing 0 volts, and I would have expected 12v for about 5 secs to prime the HP circuit, dropping back to zero - well, that is what it used to do!

So - either I can find someone that can tell me what to test (just in case something is not connected and signalling the ECU to NOT fire up, or I find another E38 to try, or get mine tested....I don't care which... but I need to do something... otherwise this car will become the MOST expensive ORNAMENT I have ever owned! ...and it won't even fit on my mantlepiece!

Talking to someone today that happened to mention that he thought the HP Pump relay to ecu feed should provide earth to the relay not provide feed! He says most do that!

..so that got me 2 & 8ts and wondering if the relay is wired wrongly! Can anyone verify what should pin 50 from the ECU be doing?

Doesn't explain to me why it used to work and now it is not!

and totally fed up!

Is it possible that whilst you have been taking out and then putting back the engine, you have disturbed some of the work that you did when you did this ?

http://www.pistonheads.com/gassing/topic.asp?h=0&a...

So last night I decided to get tough with my prodigy!
I marched in to the garage and checked all the connections and then when I realised all was as it should be...

... I "R-i-g-h-t! I have had enough! You miserable little ...car- thing! You had better start - or I will beat you to an inch of your life!"
..switched on the ign... and ...Whaaaat? Both Pumps sprang into life

...ehh?

Hit the starter.. and as if nothing was ever wrong the damn thing started without a murmur!
I wiggled things again...but it wouldn't go wrong!

I DONT UNDERSTAND!

Thanks for your help ...but I am none the wiser!

Seems that doing a Faulty-towers actually works sometimes!

It must have been a connection somewhere, most likely an earth.

Anyway, onwards and upwards.


Paul