Lucas 14 cux

[grngriff]

Hi

Does anybody have an ecu they would like to part with, don't fancy parting with 300 pds if
It doesn't cure my 5.4k rev problem.
Changed ign module, cap ,rotor arm,vac unit. Any other ideas would be more than welcome?

Pete

[QBee]

Please describe the problem

[grngriff]

Sorry mate,
problem is it wont rev past 5.4k, it like its hitting the rev limiter.
Back in april had the 4.3 BV upgrade, new cam, chip etc and its
Done it ever since.
So either a dodgy chip or ecu problrem checked with powers chip rev limiter not set at
5.4k

Pete

[TV8]

Have you got access to an ECU lead and rover Guage? If you have, set the system to log details and see what the max rev the ECU is actually doing.

[grngriff]

Sorry tv8 I haven't ,only ecu mate no logged faults,
Before the upgrade it used to rev to 6.5k so I'm at loss at the moment after doing a
Search factbv changed his ecu and cured the same problem and one other did the
Same and cured his problem.
Which leads me to the ecu

Pete

[vjj]

Talk to Mark Adams

[blitzracing]

Sounds like you have a Range Rover chip in it? Open the ECU up and see whats written on the chip. The TVR ones had the rev limiter removed, and will be hand written. Who did the chip upgrade? The ECU's themselves are bog standard Range Rover 14CUX units just with a TVR chip added. You can get these second hand for £35 upwards from breakers. TVR power did have the various TVR chips available at 1/4 of of the cost of Mark Adams offerings, although tuned engines can be an issue.

[shpub]

anonymous said:

[redacted]

It does.

Does sound like it has a Range Rover chip installed with the built in rev limit.

[PeteGriff]

grngriff said:

Sorry mate,
problem is it wont rev past 5.4k, it like its hitting the rev limiter.
Back in april had the 4.3 BV upgrade, new cam, chip etc and its
Done it ever since.
So either a dodgy chip or ecu problrem checked with powers chip rev limiter not set at
5.4k

Pete

Hi GrnGriff, why don't you take it back to whoever done the upgrade work and chip? Surely it's their issue not yours to solve mate!

[mattrosersv]

I see you are in Wiltshire. Might not be end solution as mine is a 5.0, but if you want to try a couple of things I have a tornado chip in my ECU (sat in my garage after Megasquirt upgrade) and the original 5.0 chip kicking about somewhere.

I am 5miles North of Andover.

Let me know if I can help.

Matt

[blitzracing]

Two steps backwards, as I think you have checked the chip already......The inbuilt rev limiter is like hitting a brick wall, as it simply cuts all the injectors dead, no misfires, or "soft" rev limiting. Does it do this in any gear? I think (?) If you can get it past 5400 rpm in a lower gear at a lower throttle opening, its not the rev limiter. It could be fuel related if its only in top gear / full load. You can directly monitor the lambda probe outputs with a test meter to check for lean running. Unfortuatley RoverGauge (or ECUmate)wont report back the lambda status in open loop (above 3400 rpm) as the trim values are the ECU's response to the lambda voltages, not the physical voltages from the probes. I dont mind passing an eye over it if you want to bring it over to me. Im near Junc 14 M4.

[grngriff]

Hi

Blitz, it does it in all gears under load and in neutral, powers did the upgrade so assume the chip is ok
As Dom is quite thorough,opened up the ecu saturday and there's nothing on the chip.

I'm working 7 days a week so I'm trying to save myself the journey up to powers
Blitz i might take you up on your offer if I can get away early over the weekend thank you

Pete

[Sardonicus]

PeteGriff said:

Hi GrnGriff, why don't you take it back to whoever done the upgrade work and chip? Surely it's their issue not yours to solve mate!

Spot on they will be reluctant if you start fiddling though

[blitzracing]

Just a thought- RoverGauge will show you the Eprom revison. Its either on the top of the screen on the most recent version or under the options menu on the older versions- something like "get prom revision". If its Range Rover it will give you a tune revision. I think the TVR ones are marked "aftermarket"

[MPoxon]

I take it the ECU Mate is showing the Tune resistor as either White or Green? I had an issue with mine where the resistor failed and the ECU went into 'Limp mode'





Also note engine needs to be switched on to test.

[grngriff]

Hi

Blitz I don't have the rover gauge so can't see the chip, but thanks for the info.
as mine used to be a 4.3 catted now changed to non cat but still running the
Lambda sensors the ecu mate still reads white with cats,

So doesn't display limp home mode so I would say that's normal.

Pete

A question would changing back to the catted y piece make any difference?
Is the fuel map etc any different between non Catt or catted ,other than the tune resistor type

Edited by grngriff on Tuesday 10th September 19:44

[blitzracing]

Nope- the engine will run in cat mode without physical cats quite happily, all the ECU does is control the fuel a bit more tightly below 3400, above that no difference. The only reason to switch maps is to reduce shunting if you have it, and then the green map has to be sutible for your engine set up before you switch.

[grngriff]

Hi

Just a quick update, bought another ecu which came with a 5l cat chip.
Swapped over tonight just took it out and hey presto,I now have car that revs
Past 5.4k.

So the next question , the new ecu seems to have a Lucas cover over the chip.is it a cover?
I still don't know if it was the ecu or the chip causing the problem as I ran with the 5l cat chip
In.
Thanks in advance
Pete

Its a 98 ecu if that helps

Edited by grngriff on Saturday 21st September 18:57

[blitzracing]

Yes its just that. Just crush it carefully across the sides with a big pair of pliers and it should come off. You dont need it.

[blitzracing]

Yes its just that. Just crush it carefully across the sides with a big pair of pliers and it should come off. You dont need it.