ECU Part Number - 400 se flapper

[matt-man]

Hi All,

I had the chance to try and sort this on going problem with the wedge again at the weekend, and with help from Steve_D from the Ultima Forum who very kindly tested and adjusted the throt pot and lent me an ECU and Flapper i am almost in business!

I tried the flapper and this wasnt the problem so another possible ticked off the list...

The ECU steve lent me had a different part number to mine and was from a 3.5 and this totally transformed the car! FANTASTIC!!

I am going to send mine off for repair although can i confirm the number to see if what was in my car is correct?

Its a LUCAS 4CU fuel control unit - 83986B

Does this sound right?

Dont want to send off for repair if it isnt right!

This means i might be let out to play soon!!!!

[carob]

Hi Matt

I have got a spare here and the number is 4cu control 84477B.

It was off the old 350, so there may be a few different numbers.

Rob

[rev-erend]

This might be useful :

http://www.carelect.demon.co.uk/rrp1.html

Also - at bottom he quotes somewhere that repaired his 4CU

http://www.mez.co.uk/TuningTheRoverV8-pt9.html

Another very useful document to download here - those who love electronics will love it.. get that soldering iron warmed up.

http://www.vintagemodelairplane.com/pages/Rover_Te...

Edited by rev-erend on Tuesday 22 September 12:30

[Wedg1e]

The ECUs are all the same, just that a few component values were altered to suit the required power delivery of the intended vehicle. Lucas changed the part number to differentiate but in essence you can convert any of them to do the job as long as you know which bits to change and the required values to use.
I have a couple of ex-Range Rover 3.5 ECUs tuned for a 390...

[adam quantrill]

Matt - buy a soldering iron and some solder, won't cost you more than a tenner.

It takes about an hour to go over all the joints on the two circuit boards.

You can still sent it away if that doesn't work!

[haighy]

ive got a complete fuel injection system and wiring loom off my 400 se that im wanting to sell which was working perfect.also full low mileage engine with suspected cracked liner that was running sweet.

[leorest]

adam quantrill said:

Matt - buy a soldering iron and some solder, won't cost you more than a tenner.

It takes about an hour to go over all the joints on the two circuit boards.

You can still sent it away if that doesn't work!

You'll need real lead solder not the namby pamby RoHS compliant stuff they sell these days! I did this to mine and it solved the problem.

[adam quantrill]

Actually the main thing you need is flux (which comes in the solder), you could also probably use a flux pen or flux dispenser and melt the existing solder with that on there.

You can still get the lead solder - we have it at work - there's some on ebay at the moment - look for tin/lead solder.