Fuel trim issue (according to Rover Gauge)
Discussion
Thats a typical error if you have no lambda probe output- so possibility are 1) the probe is faulty 2) Its missing at 12 volt supply (red wire) 3) there is an open circuit between the probe output wire (black) and the ECU or 4) the earth is open circuit (white wire). An ECU reset will clear the error for about 5 mins until the ECU works out there is no output again, and flags the error.
Where is best place to start looking..don't really know how these work.
Have the battery disconnected at the moment.
I also have a meter..
Is it something you can walk me through ??
Is it likely to be a electrical issue?
Have removed the plugs and they don't look to bad..I'll post up a picture of them..
Thanks for you assistance Mr blitz racing ))
Have the battery disconnected at the moment.
I also have a meter..
Is it something you can walk me through ??
Is it likely to be a electrical issue?
Have removed the plugs and they don't look to bad..I'll post up a picture of them..
Thanks for you assistance Mr blitz racing ))
4iturboob said:
car seems to run fine
4iturbobob said:
fuel trim on even bank running 100%, odd seems to be fine.
4i turbo bob said:
My advice would be disconnect the RoverGauge, reconnect your battery, and go for a lovely drive.
Enjoy the car and stop chasing faults that amount to nothing...
4i turbo bob said:
Can't do it..
It needs to be right..
something is obviously wrong.
Have you considered it might be the RoverGauge that's wrong?It needs to be right..
something is obviously wrong.
RoverGauge is nothing more than a basic piece of software created by an enthusiastic amateur to try and hack into the 14CUX ECU to read it's outputs, it's not like it was professionally developed by Lucas in conjunction with the development of the ECU.
I wouldn't trust RoverGauge for one minute over proper old school diagnosis skills, my guess is it's full of bugs and gives lots of false readings that only serve to give TVR owners that use it a load of unnecessary anxiety.
Remember, RoverGauge only reads outputs, its not like you can map the car with it, skilled mechanics have been tuning cars very effectively based on plug colour and the way a car drives for over 100 years.
If the plugs look right and the car drives nicely why are you even plugging in the very basic and amateurish RoverGauge in the first place?
It's very probably just telling you a load of old tosh.
Plugs good, drives good, is good.
Pack away the RoverGauge nonsense and enjoy the car
ChimpOnGas said:
Have you considered it might be the RoverGauge that's wrong?
RoverGauge is nothing more than a basic piece of software created by an enthusiastic amateur to try and hack into the 14CUX ECU to read it's outputs, it's not like it was professionally developed by Lucas in conjunction with the development of the ECU.
I wouldn't trust RoverGauge for one minute over proper old school diagnosis skills, my guess is it's full of bugs and gives lots of false readings that only serve to give TVR owners that use it a load of unnecessary anxiety.
Remember, RoverGauge only reads outputs, its not like you can map the car with it, skilled mechanics have been tuning cars very effectively based on plug colour and the way a car drives for over 100 years.
If the plugs look right and the car drives nicely why are you even plugging in the very basic and amateurish RoverGauge in the first place?
It's very probably just telling you a load of old tosh.
Plugs good, drives good, is good.
Pack away the RoverGauge nonsense and enjoy the car
Blimey - thats strong damnation for a product you now nothing about !- But hey- You are winding me up and Im not going to fall for it. RoverGauge is nothing more than a basic piece of software created by an enthusiastic amateur to try and hack into the 14CUX ECU to read it's outputs, it's not like it was professionally developed by Lucas in conjunction with the development of the ECU.
I wouldn't trust RoverGauge for one minute over proper old school diagnosis skills, my guess is it's full of bugs and gives lots of false readings that only serve to give TVR owners that use it a load of unnecessary anxiety.
Remember, RoverGauge only reads outputs, its not like you can map the car with it, skilled mechanics have been tuning cars very effectively based on plug colour and the way a car drives for over 100 years.
If the plugs look right and the car drives nicely why are you even plugging in the very basic and amateurish RoverGauge in the first place?
It's very probably just telling you a load of old tosh.
Plugs good, drives good, is good.
Pack away the RoverGauge nonsense and enjoy the car
4i turbo bob said:
Got the earth no problem
No 12v between whit and red with ignition on..
Where now ??
The ECU looks for a switching signal between 0 and 1.2 volts from the probe output- thats across the black (signal ) and white (ground wire). It should cycle at about once a second at idle, and increase in speed as the RPM rises. Basicaly a signal of 0 volts is a mixture leaner than 14.7:1 and a signal of over 1 volt is a signal richer than 14.7:1, so the ECU keeps the mixture constantly cycling around a mid point of 14.7:1. In your case it can get the mixture rich enough to get a voltage form the probe, so it keeps adding more and more fuel (the trim) to try and get it to respond, which its not doing hence the error code.No 12v between whit and red with ignition on..
Where now ??
Quite a bit here:
http://www.g33.co.uk/fuel_injection.htm
or instructions for your fault here:
http://www.g33.co.uk/images/PDFS/14cux%20faulot%20...
The plugs may look fine, as all the trim does is add or subtract to a basic fuel setting from the map, which wont be that far out. The ECU will simply use this value without the trim. You could run anywhere between about 13.5:1 to 15:1 AFR and hardly notice the difference in the way the car drives, but it will fail an MOT emission test if the lambda trim is not cycling as it should.
As for the 12 volts- its on the same supply as the fuel pump so its only there while the car is running, or a few seconds when the ignition is first turned on.
Edited by blitzracing on Sunday 12th July 16:55
Edited by blitzracing on Sunday 12th July 16:57
blitzracing said:
ChimpOnGas said:
Have you considered it might be the RoverGauge that's wrong?
RoverGauge is nothing more than a basic piece of software created by an enthusiastic amateur to try and hack into the 14CUX ECU to read it's outputs, it's not like it was professionally developed by Lucas in conjunction with the development of the ECU.
I wouldn't trust RoverGauge for one minute over proper old school diagnosis skills, my guess is it's full of bugs and gives lots of false readings that only serve to give TVR owners that use it a load of unnecessary anxiety.
Remember, RoverGauge only reads outputs, its not like you can map the car with it, skilled mechanics have been tuning cars very effectively based on plug colour and the way a car drives for over 100 years.
If the plugs look right and the car drives nicely why are you even plugging in the very basic and amateurish RoverGauge in the first place?
It's very probably just telling you a load of old tosh.
Plugs good, drives good, is good.
Pack away the RoverGauge nonsense and enjoy the car
Blimey - thats strong damnation for a product you now nothing about !- But hey- You are winding me up and Im not going to fall for it. RoverGauge is nothing more than a basic piece of software created by an enthusiastic amateur to try and hack into the 14CUX ECU to read it's outputs, it's not like it was professionally developed by Lucas in conjunction with the development of the ECU.
I wouldn't trust RoverGauge for one minute over proper old school diagnosis skills, my guess is it's full of bugs and gives lots of false readings that only serve to give TVR owners that use it a load of unnecessary anxiety.
Remember, RoverGauge only reads outputs, its not like you can map the car with it, skilled mechanics have been tuning cars very effectively based on plug colour and the way a car drives for over 100 years.
If the plugs look right and the car drives nicely why are you even plugging in the very basic and amateurish RoverGauge in the first place?
It's very probably just telling you a load of old tosh.
Plugs good, drives good, is good.
Pack away the RoverGauge nonsense and enjoy the car
blitzracing said:
4i turbo bob said:
Got the earth no problem
No 12v between whit and red with ignition on..
Where now ??
[quote=blitzracingThe ECU looks for a switching signal between 0 and 1.2 volts from the probe output- thats across the black (signal ) and white (ground wire). It should cycle at about once a second at idle, and increase in speed as the RPM rises. Basicaly a signal of 0 volts is a mixture leaner than 14.7:1 and a signal of over 1 volt is a signal richer than 14.7:1, so the ECU keeps the mixture constantly cycling around a mid point of 14.7:1. In your case it can get the mixture rich enough to get a voltage form the probe, so it keeps adding more and more fuel (the trim) to try and get it to respond, which its not doing hence the error code./quote]No 12v between whit and red with ignition on..
Where now ??
Surely it would be infinitely better to just fit a proper wide band system.
Such systems are not expensive these days, their clear advantage over the antique lurching narrow band system being that you get to actually see the true AFR in real time.
And in a format everyone can understand
Has anyone actually used this RoverGauge system to fix anything?
All you ever read about is people opening up, getting confused, then asking for help to interpret what it all means.
I still say...if the plugs look good, if it drives good, it is good
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