Need help with a Range Rover 4.6ltr V8 running issue.
Discussion
Hi
I’m working on a kit car with a Range Rover 4.6ltr V8 (fuel injected) engine, the car starts and runs perfectly, until the coolant temperature reaches 100°C at which point the engines tick-over suddenly jumps up by an extra 500 RPM, and stays there. You can still drive the vehicle around, but having a constant extra 500 RPM on the revs isn’t very good for fuel economy on a car that already drinks petrol.
The car has a 1990s Lucas ‘hot-wire’ fuel management ECU, so I connected a ‘Rover Gauge’ diagnostic system to it to read any fault codes, and see live monitoring but, unfortunately, I can’t get the dam thing to communicate, so I’m going to have to diagnose the fault the hard way.
My suspicion is that one of the ECUs thermal sensors has gone open circuit and without the correct data the ECU is just defaulting to a pre-set fuel delivery amount, does this sound plausible? To make matters worse, the fuel management ECU has a custom ‘Tornado Chip’ fitted.
Is anyone familiar with this setup? – Any advice gratefully received. (I have a complete electrical schematic for the car).
Ben
I’m working on a kit car with a Range Rover 4.6ltr V8 (fuel injected) engine, the car starts and runs perfectly, until the coolant temperature reaches 100°C at which point the engines tick-over suddenly jumps up by an extra 500 RPM, and stays there. You can still drive the vehicle around, but having a constant extra 500 RPM on the revs isn’t very good for fuel economy on a car that already drinks petrol.
The car has a 1990s Lucas ‘hot-wire’ fuel management ECU, so I connected a ‘Rover Gauge’ diagnostic system to it to read any fault codes, and see live monitoring but, unfortunately, I can’t get the dam thing to communicate, so I’m going to have to diagnose the fault the hard way.
My suspicion is that one of the ECUs thermal sensors has gone open circuit and without the correct data the ECU is just defaulting to a pre-set fuel delivery amount, does this sound plausible? To make matters worse, the fuel management ECU has a custom ‘Tornado Chip’ fitted.
Is anyone familiar with this setup? – Any advice gratefully received. (I have a complete electrical schematic for the car).
Ben
Try and get Rovergauge up and running as it will help.
Its worth checking the coolant temp sensor, also the wiring to the maf sensor.
Im assuming its a 14cux system?
If so some info here.
http://g33.co.uk/pages/technical-fuel-injection.ht...
Its worth checking the coolant temp sensor, also the wiring to the maf sensor.
Im assuming its a 14cux system?
If so some info here.
http://g33.co.uk/pages/technical-fuel-injection.ht...
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