14CUX ECU help

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durhamsmudger
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14CUX ECU help

Post by durhamsmudger » Mon Nov 27, 2017 10:11 pm

I have a problem with my Morgan ECU, can anyone on this forum recommend a good reasonably priced company that can test & repair
Cheers



Robrover
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Post by Robrover » Tue Nov 28, 2017 1:11 am

Mark Adams / Tornado Systems is the guru with these..see their Facebook page

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r2d2hp
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Post by r2d2hp » Tue Nov 28, 2017 7:59 am


DaveEFI
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Re: 14CUX ECU help

Post by DaveEFI » Tue Nov 28, 2017 9:52 am

durhamsmudger wrote:I have a problem with my Morgan ECU, can anyone on this forum recommend a good reasonably priced company that can test & repair
Cheers
Do double check it isn't a problem with a sensor or the wiring. Perhaps if you gave the symptoms?
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Ian Anderson
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Post by Ian Anderson » Tue Nov 28, 2017 7:19 pm

I would first try resetting it
Simple, disconnect the battery for 30 seconds.
It will clear the fault codes and fire up again.

Ian
Owner of an "On the Road" GT40 Replica by DAX powered by 3.9Hotwre Efi, worked over by DJ Motors. EFi Working but still does some kangaroo at low revs (Damn the speed limits) In to paint shop 18/03/08.

durhamsmudger
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Post by durhamsmudger » Tue Nov 28, 2017 11:14 pm

This is on a '99 Morgan 3.9, with the same type of ECU fitted to the TVRs of the era
Ok a brief history
About 6 months ago I started having intermittent problems with the fuel pump not starting,there is nothing wrong with the pump
The green immobiliser box is communicating to the ECU OK
The spider unit is wired out
the inertia switch , main relay and fuel pump relay have been replaced
all the earths from the ECU are fine
The wire from -ve side of the fuel pump relay coil which returns to the ECU has voltage, but the relay isn't pulling in because whatever it is in the ECU that controls the operation of the fuel pump isn't allowing the the relay coil -ve to go to earth.

I am hoping it's something simple like a dry soldered joint, what makes me think this, is it started off as an intermittent problem, then because circumstances meant I couldn't use the car for about 6 weeks - then when I went to start it nothing ! I have redone all the checks but the pump wouldn't start
the pins and plug show no signs of corrosion

That is why I want it testing & repaired

unstable load
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Post by unstable load » Wed Nov 29, 2017 1:48 am

Isn't there a switch that is oil pressure related in that system? Maybe that is starting to go bad on you and causing the issue?
Cheers,
John

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Ian Anderson
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Post by Ian Anderson » Wed Nov 29, 2017 6:35 am

Keep your eye on E bay
https://www.ebay.co.uk/itm/TVR-4-0-L-Ca ... SwskFZg0uJ

This one is a bit pricy, and I have seen them at £50

If you can wait till around Christmas I can dig my spare out the garage and let you try a different box.
I work in Edinburgh and the car and bits are in Surrey so a bit difficult to do it before then!

Cheers
Ian
Owner of an "On the Road" GT40 Replica by DAX powered by 3.9Hotwre Efi, worked over by DJ Motors. EFi Working but still does some kangaroo at low revs (Damn the speed limits) In to paint shop 18/03/08.

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Post by DaveEFI » Wed Nov 29, 2017 9:32 am

A define fault like that would be at the easier end of repairing. The snag being with all intermittent faults is having it show up on test.

If you can't find a firm to to a warranted repair, I'd certainly have a look at it. Although I'm more familiar with the older 4CU.
Are they that expensive to buy used?

There will generally be a circuit that drives the pump relay. That controlled by a signal from the processor itself. If the fault is in that driver, likely an easy fix. If the fault is within the processor, not.

Oddly, pump relay driver failure is perhaps the most common fault I've fixed on Megasquirt.
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Ian Anderson
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Post by Ian Anderson » Wed Nov 29, 2017 5:47 pm

There is a black wire that follows the inlet hose from the plenum to the air flow meter

If that comes free the pumps do not run, we'll certainly did not run on mine!

Ian
Owner of an "On the Road" GT40 Replica by DAX powered by 3.9Hotwre Efi, worked over by DJ Motors. EFi Working but still does some kangaroo at low revs (Damn the speed limits) In to paint shop 18/03/08.

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richardpope50
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Post by richardpope50 » Mon Dec 04, 2017 12:22 pm

Just jumping in on the act.

I have a spare 14CUX ECU. It came off my 1997 Griffith donor engine that had done 41k miles. Used on my Dax Rush for a week or so and then I switched to MegaSquirt.

PM me if interested.
Richard.
Dax Rush 5.0l TVR V8, EFI with Megasquirt ECU and wasted spark, Racelogic Traction Control, ABS and Quaife LSD

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Post by DaveEFI » Mon Dec 04, 2017 12:59 pm

It would make sense to try a known good one before spending money having one tested/fixed. As that would eliminate other causes.
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