![]() ![]() Just FYI, basic Lambda sensor operation :ĭuring idle, the ECU will constantly run a rich/lean cycle on closed-loop control, usually under WOT conditions it will go open loop and enrich the mixture, during cruise it is once again closed-loop and will oscillate up/down.Ī cold sensor won't give any output voltage and nor will a dead one - this causes the ECU to try and enrich the mixture causing rich running.ĭuring the MoT on my Coupe one year, one of the Lambdas failed during the emissions test. ![]() Just another thought - have you tried disconnecting the +ve feed from the compressor clutch and feeding the clutch direct from the battery? That will prove the operation of the clutch at least. The generally accepted service life of a Lambda sensor is 10 years or 100k miles so the chances are renewing them and resetting the ECU will return things to normal operation. With the mileage at 133k on the last MoT in March, i'd suggest renewing the Lambda sensors and resetting the ECU and also running some Cataclean through the fuel system. It could be sensor 2 is unplugged or some other workaround has been used, assuming it has two sensors of course. If it has, i think you may have found the problem. Have you actually confirmed it has 2 sensors? If it is indeed the post-cat sensor it should follow what sensor 1 does but with a lower value. More worrying is the fact that the sensor 2 is showing 0.48V constantly. Until the sensors are hot enough (i presume they're heated on the Merc as they are on your Rover) they shouldn't give any voltage at all. The sensor 1 value that oscillates between 0.18 - 0.82V is correct for a hot engine under closed-loop control. Given it's not a Vee engine, i'd suggest the "sensor 2" value of a constant 0.48V is the post-cat sensor. How soon after a cold start is the reading available for the Lambda sensors Adrian? ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |