Lambda sensors!!!!! .. Chewbacca?? **FIXED**

[steveo76]

Ok here is the story of my car now testing my will to live

Last week i hooked up INPA to check faults with my car and i had fault (202) Lambda sensor bank one, replaced lambda sensor, Cleared fault all has been well.

Today whilst driving the car lacked power when i booted it and held back,,,sort of limp home mode feeling ,,And with it being Auto it refused to go up a gear..

I pull over popped the bonnet to take a look for anything untoward and all seemed ok ticked over a bit lumpy!


I get back in and it drove home fine?

Hooked up to INPA and faults were lambda sensor bank two,,,cylinders 4+ 5+ 6

Car drives ok now and there don't seem to be any vac leaks

So far this car has had Radiator changed, water pump, heater hose, both control arms, lambda sensor...All within the three months i have owned it

[Ronnie]

You're either very unlucky or have a issue elsewhere, can you view how quickly the lambda sensor is switching on your Inpa? May help in diagnosing the issue.

[steveo76]

You're either very unlucky or have a issue elsewhere, can you view how quickly the lambda sensor is switching on your Inpa? May help in diagnosing the issue.

Unlucky sounds about right for me mate

Would't know to go about seeing when it switches on mate?

[Ferret]

Would't know to go about seeing when it switches on mate?

Not switching on, but switches.

Somewhere in INPA is an analogue value, and you'll see the bar rising and dropping again... Thats the switching Ronnie mentioned.

[steveo76]

Silly me LOL!

I will take a proper look at the analogue values of the lambda sensors in the morning Ferret and report back

[steveo76]

Before i did anything today i did this simple test i found on you tube in regards to vac leaks>

BMW Oil seperator (chubacca noises) - YouTube

My car sounds exactly the same

The ccv looks like a right pita to get to as it's tucked away under the inlet manifold why the hell did they locate it there for gods sake

Anyone here changed one before? i need some help on this bugger!

[steveo76]

Just thought i would share my findings of today when i changed the CCV.

Total time spent arsing about was approx three hours

It is not a hard job at all just bloody time consuming due to its location...

This is the first apparent problem that i noticed once i started stripping things down, I came across a split vac pipe from the fuel pressure regulator to the CCV. Only the M52/(TU)s have this pipe. also the CCV was covered in old oil.




Once i took the CCV out of the car i opened it up to find this>






The internals were full of crap and two tears in the rubber diaphram

Car runs sweet again now with no codes showing and no silly chewbacca sounds

[dailydoggy]

marvelous news...

[steveo76]

It has worked wonders with my fuel consumption

OBC now showing 30MPG pottering about and 38/40 on the motorway

[dailydoggy]

it will do running lean the ECU is continously telling the injectors to spray more fuel in to try richen the mixture up, its why vacuum leaks are deadly as its unmetered air (not being measured by the MAF) entering the engine which gets noticed by the lambda's which in turn tells the ECU i need more fuel cos im detecting too much oxygen in the spent gases...


hence shite MPG and a dirty running and unhappy engine...