Lambda 1 Fault

[P S K]

Hi All.

Have a problem with poor running and have plugged in laptop to find a Lambda 1 fault showing.

Checked connections above gearbox. All fine. Replaced sensor today and sadly it's still the same, poor running and fault still showing.

Have also checked ECU connector, which seems to be OK.

Any pointers as to where to turn my attention next?

Thanks

[Tanguero]

If the fault is still showing on a new sensor with no wiring issues then it is possibly that bank running sufficiently rich to max out the sensor. Is there an AFR fault as well?

[P S K]

Thanks for the reply. Yes I have an AFR on that bank showing Bad.

Reading through some previous threads, could be an injector stuck open?

[Tanguero]

More likely to be lack of spark on one cylinder, though a stuck injector would do it. Injectors are more reliable than coils and HT leads as a rule though.

If you uses a stethoscope (or a long screwdriver against your ear) you can listen to each injector while the engine is running. It should be clicking clearly and you will be able to hear if one isn't closing.

Coils and leads would be my bet - but listening to injectors is free so try that first.

[P S K]

Again, thanks for your input! Plugs & leads recently replaced.

Took fuel rail off and cleaned injectors. Refitted. Adaptives reset. All running perfectly again with no fault codes and good AFRs.

[Tanguero]

Glad you got it sorted! Obviously a grungy injector not closing properly.

[P S K]

Tanguero said:

Glad you got it sorted! Obviously a grungy injector not closing properly.

Looks that way! Thanks for your help.

[Gray_101]

Hi Paul,

Glad to hear you ve sorted your Cerb.

Just out of intrest, how did you clean your injectors ?

[P S K]

Gray_101 said:

Just out of intrest, how did you clean your injectors ?

I carefully removed each injector from the rail, then I made up a connector the same as fitted to the cars wiring harness, with a switch in series. Connected to a spare 12v battery.

Then sprayed carb cleaner through them while pulsing the switch until a good consistent spray pattern achieved.

Seemed to be very effective and sure beats the £15 per injector I had been quoted locally, which didn't include removing them from the car.

I can't take credit for the system, got the idea from here.....

http://www.youtube.com/watch?v=VFJlTfHyrUk

Edited by P S K on Sunday 2nd September 20:32

[Gray_101]

P S K said:

Gray_101 said:

Just out of intrest, how did you clean your injectors ?

I carefully removed each injector from the rail, then I made up a connector the same as fitted to the cars wiring harness, with a switch in series. Connected to a spare 12v battery.

Then sprayed carb cleaner through them while pulsing the switch until a good consistent spray pattern achieved.

Seemed to be very effective and sure beats the £15 per injector I had been quoted locally, which didn't include removing them from the car.

I can't take credit for the system, got the idea from here.....

http://www.youtube.com/watch?v=VFJlTfHyrUk

Edited by P S K on Sunday 2nd September 20:32

Thats a brilliant idea, i think i will do the same on every 12k service.