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MG MGB GT V8 Factory Originals Technical - 14CU to 14CUX swap info

Last week I successfully switched from a 1989 14CU ECU to a 14CUX unit from a 1994 Range Rover with fault code display. It was a good improvement and the engine runs smoother and has more power. I am using a 470 Ohm Tune Select resistor. I have updated my website to include a detailed account of how it can be done. Just thought I would post this to help anyone in the same situation. I also included a few pages from the factory Range Rover manual and all the different tune select resistance numbers.

http://rebornco.com/mgbv8/newmgbv8.htm in the fuel section

http://rebornco.com/mgbv8/rv8fuel.htm

Evan Amaya

Just love that aeroplane propeller
Peter

Hi Evan, thanks for the interesting info about the O2 sensors. I was under the impression that they were ignored by the box with one of the tune resistors.

And, the first time I have learned that there are 4 tune resistors for the CUX box. Might be worth some experimentation.

Have a good week-end.
Edd Weninger

Hi Evan
I cannot find a tune resistor in my harness anywhere, also my harness plug doesn't have a pin 5 ! I definately have a 14CUX ecu and the harness is off a 94/5 4.2 engine. Any ideas?
Regards
Tony
Tony Bates

Hey Tony,
The late 94 and 95 Range Rover Classics (with the dual air bags, new style dash) had a slightly different system than the rest of the Classics. The ECU was located on the passenger side kit panel and had no tune resistor. They had the same setup as the 95 Disco I.
Evan Amaya

Hi Evan,
You say the same set up as the 95 Disco 1, the configuration was still using a 14CUX ecu? Certainly my engine and EFI is not a GEM's system.
Regards
Tony
Tony Bates

The 95 disco ran the 14 cux not Gem.
Evan Amaya

A look through the Rover factory manual shows that for the Range Rover using a 14cux after a certain vin#, the tune resistor was deleted. This was a 1991 update which would lead one to believe that some/most/all Rovers after 1991 had no tune resistor.

Also in the update is mention that the revised throttle position sensor was no longer adjustable & did not require calibration, while the RPI website indicates these need to be calibrated & that you should cut slots at the screw holes to allow adjustment.

Is some of this a bit confusing???

Thanks to Evan for all his help on my conversion.

Jim Stuart
Jim Stuart

This thread was discussed between 28/04/2004 and 01/05/2004

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