I've got a wierd (ish) issue with the towcar; it's a 1998 Rangie P38 with the 4.6 V8 running on GEMS.
Took it in for the MoT a couple of weeks back, quietly confident all would be OK but the emissions were a (literally) eye-watering fail with a CO reading of 7%. Interrogation with the Hawkeye (cheaper than Nanocom) - after I'd rewired the diagnostic connector - shows the Lambda sensor signals pegged at 1V (these are Titania sensors, not your usual Zirconium), so it thinks it's running lean, so does what it thinks is right and adds more fuel in the trim to try and address the balance until it maxes out at 24%.
OK then - dead sensors, I presume. One failed eBay purchase (parts they sent aren't what they were selling
) and one correct (read substantially more expensive) order from Rimmers and a new pair of correct sensors are installed and...barely any better.
Occasionally the reading briefly drifts off "fully lean" which is a slight improvement, but 99% of the time, it's still reporting to be in fully lean mode. I did wash a bit of oil out of the connector with contact cleaner but the last cleaning didn't produce any more brown solvent, so I'm reasonably happy they're cleaned out as much as I can. A multimeter doesn't really tell me anything of substance as whilst they are a resistive sensor I can't seem to measure it (I have a vague suspicion they only really work when excited with a voltage?).
As far as I can tell, it's a straight through cable from the connector on the sump back to the ECU (as I'd expect) - faulty ECU maybe?... Totally goosed plugs despite all the washing out?
These Titania sensors seem to be only generally favoured by Jaguar and Landrover in the 90's (but also appear on other random cars along the way) and with Lucas systems so information is a bit sketchy from my research so far.
Any suggestions gratefully received - especially as the MoT expired yesterday..
Took it in for the MoT a couple of weeks back, quietly confident all would be OK but the emissions were a (literally) eye-watering fail with a CO reading of 7%. Interrogation with the Hawkeye (cheaper than Nanocom) - after I'd rewired the diagnostic connector - shows the Lambda sensor signals pegged at 1V (these are Titania sensors, not your usual Zirconium), so it thinks it's running lean, so does what it thinks is right and adds more fuel in the trim to try and address the balance until it maxes out at 24%.
OK then - dead sensors, I presume. One failed eBay purchase (parts they sent aren't what they were selling
) and one correct (read substantially more expensive) order from Rimmers and a new pair of correct sensors are installed and...barely any better.Occasionally the reading briefly drifts off "fully lean" which is a slight improvement, but 99% of the time, it's still reporting to be in fully lean mode. I did wash a bit of oil out of the connector with contact cleaner but the last cleaning didn't produce any more brown solvent, so I'm reasonably happy they're cleaned out as much as I can. A multimeter doesn't really tell me anything of substance as whilst they are a resistive sensor I can't seem to measure it (I have a vague suspicion they only really work when excited with a voltage?).
As far as I can tell, it's a straight through cable from the connector on the sump back to the ECU (as I'd expect) - faulty ECU maybe?... Totally goosed plugs despite all the washing out?
These Titania sensors seem to be only generally favoured by Jaguar and Landrover in the 90's (but also appear on other random cars along the way) and with Lucas systems so information is a bit sketchy from my research so far.
Any suggestions gratefully received - especially as the MoT expired yesterday..
