740 fault code 2-3-2

Jul 13th, 2002, 13:16

I have a 1990 740 auto with B230F engine and LH-Jetronic fuel injection. The tickover is slow (400 - 600 rpm) and the fault code is 2-3-2, adaptive lambda control lean or rich-idle. I have changed the air filter but with no result. The fault doesnt seem to be in the sensor because I assume it would show up as a fault at normal running as well. Any ideas? regards Romar

Peter Milnes · Jul 14th, 2002, 00:31

If the car drives OK then my code list suggests fuel pressure is too high or you have a leaky injector. The sensor is picking this up and would seem to be OK.

All the best, Peter.

Jul 20th, 2002, 21:00

Peter, Thanks for your help. I tested the fuel presure and injectors but no luck. Your advice set me thinking so I performed a functional test and got a code 3-3-3 instead of 3-3-2 when dropping back from full throttle open. Assuming that this had to be some sort of problem indicator I pulled down the idle switch cleaned it and the multiplug up with WD40, put it back and re-set, Bingo the revs are back where they should be.(On the other hand it could have been down to the shouting and swearing) Again many thanks for your reply

Regards Romar

Jul 13th, 2002, 13:16	#1
romar Guest Location:	740 fault code 2-3-2 I have a 1990 740 auto with B230F engine and LH-Jetronic fuel injection. The tickover is slow (400 - 600 rpm) and the fault code is 2-3-2, adaptive lambda control lean or rich-idle. I have changed the air filter but with no result. The fault doesnt seem to be in the sensor because I assume it would show up as a fault at normal running as well. Any ideas? regards Romar

Jul 14th, 2002, 00:31	#2
Peter Milnes Premier Member Last Online: Apr 10th, 2014 00:01 Join Date: Feb 2002 Location: Tonyrefail	RE: 740 fault code 2-3-2 If the car drives OK then my code list suggests fuel pressure is too high or you have a leaky injector. The sensor is picking this up and would seem to be OK. All the best, Peter.

Jul 20th, 2002, 21:00	#3
romar Guest Location:	RE: 740 fault code 2-3-2 Peter, Thanks for your help. I tested the fuel presure and injectors but no luck. Your advice set me thinking so I performed a functional test and got a code 3-3-3 instead of 3-3-2 when dropping back from full throttle open. Assuming that this had to be some sort of problem indicator I pulled down the idle switch cleaned it and the multiplug up with WD40, put it back and re-set, Bingo the revs are back where they should be.(On the other hand it could have been down to the shouting and swearing) Again many thanks for your reply Regards Romar

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