Technical Lambda / Oxygen Sensor Values 1.2 GP 57 Plate

[Sparky23050]

Hi,

Any help with the following would be appreciated.

I drove my wife's GP a few weeks ago and noticed it seemed to be lacking power, and the fuel economy has gone down around town (she used to get around 45mpg but now gets around 32mpg). Yes I know it's only a 1.2 and will never fly, but it feels a little sluggish and lumpy when you drive it.

The car has had a service - oil, all filters and spark plugs. This has had no change.

Today I connected a ELM 327 code reader to check for codes - nothing stored. I checked the lambda sensor readings and one seemed to bounce about a bit ............

Engine at normal temperature and contant 40 mph -

Bank 1 sensor 1
Between 0.095v and 0.725v

Bank 1 sensor 2
Between 0.6v and 0.7v

I know the second sensor is not used for adjusting the air / fuel mix, but is it normal for the first one to jump around so erratically when sitting at a contact speed ?

Thanks in advance for any ideas.

 

[Andy Monty]

Check the MAP sensor output....

air temp and inlet pressure


Any issues with it cutting out when started from cold?

https://www.fiatforum.com/grande-punto-guides/227405-1-2-1-4-map-sensor-replacement.html

 

[Sparky23050]

Hi Andy, thanks for the quick reply.

I will get the air temp and inlet pressure values - think I saw that they were on the software.

The car belongs to my wife and she did say that once or twice it did take a little longer to start with, but never cut out.

Have you known the first lambda sensors value to jump around ? or do you think that is just a symptom of something else ?

Sorry but will take another day for me to get the values above as she's just gone out !

 

[Andy Monty]

Ive never had any issues with my Lambda sensors.. And cant recall any one here with an issue TBH

Other simple things to try

Check both the breather hoses are clear.. the smaller one just pulls off at both ends..

flush with degreaser if creamed up (short journeys can cause this as the engine never gets hot enough) so dont go all head gasket panic if they are full of mayo


https://www.fiatforum.com/grande-punto-guides/262269-breather-hose-replacement-1-2-1-4-8v.html


whilst your at it clean your ICV and do a relearn

https://www.fiatforum.com/stilo-guides/83260-cleaning-your-inlet-control-valve.html


https://www.fiatforum.com/grande-punto/262685-1-2-wont-idle.html?p=2697299