Vehicle & Technical > Discovery
V8 over heating
Range Rover Blues:
Disconnect the Lamdas at the back of the engine bay, you can follow the wiring up but mine have a white 3 pin plug if this helps.
Next to the ECU is a small resitor in clear haeat shring tubing, often looped round so that it fits onto a connector. Remove it and replace with one from a non-lamda car or replace the resitor with one of the correct value if you can solder. The ECU then thinks it is a non-lamda car. You could try just pulling the lamdas off, one at a time to see if it runs better as the ECU has a certain degree of redundancy in the programing, eg mine runs fine with no MAF sensor.
Henry Webster:
--- Quote from: "Range Rover Blues" ---Disconnect the Lamdas at the back of the engine bay, you can follow the wiring up but mine have a white 3 pin plug if this helps.
Next to the ECU is a small resitor in clear heat shring tubing, often looped round so that it fits onto a connector. Remove it and replace with one from a non-lamda car or replace the resitor with one of the correct value if you can solder. The ECU then thinks it is a non-lamda car. You could try just pulling the lamdas off, one at a time to see if it runs better as the ECU has a certain degree of redundancy in the programing, eg mine runs fine with no MAF sensor.
--- End quote ---
Absolutely correct - the engine in the racer now runs without lambda sensors because we replaced the 'tune resistor'. Basically this selects which map the ECU uses. I think that there are about 4 different maps in total on a 14CUX.
RRB - Your's may appear to run fine with no MAF sensor, but when I had one fail on the Welsh Hillrally last year and we disconnected it, whilst it went well enough it did run over-rich to protect the engine from leaning out. Really stung the eyes after a few stages and we were pouring petrol in it like it was going out of fashion (well more than normal anyway!) also fuelled up the plugs.
Don't know whether this will solve your problems though Disco-V8 its really difficult to diagnose these sorts of problems remotely. I struggled with an overheating Tdi a while back, radiator looked fine and flushed ok, but it was not until I replaced it that I sorted the problem. It was missing some fins, just really difficult to see past the fan etc on the back!
Range Rover Blues:
I get what you're saying there Henry but on the LSE I still have the lamdas connected, so the ECU has 2 ways of deriving the air/fuel ratio. If you like the MAF is a pro-active measurement, the lamdas are reactive. This is why MAF sensors are so much better than VAF sensors, to calculate the MAF an ECU needs MAP and ACT sensors too (manifold air pressure and air charge temperature).
Henry Webster:
Fair point, but I would imagine that the ECu goes into safe mode if any one of its core sensors goes down. I'd be surprised if it didn't go into safe mode if the MAF was disconnected. They aren't that clever.
H
Range Rover Blues:
I honestly don't know, it drinks like a fish all the time no matter how it's set up.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version