4 replies to this topic

[RWD3M]

Hi all,

 

In preparation for the approaching spring (asuming we get one this year) I took my wife's '97 MPi for an MoT this morning. Unfortunately, it failed on emissions, specifically high CO (HC and Lambda both ok). Additionally, the idle seems a little (a lot?) on the high side at around 12 - 1400 rpm. Following lengthy research here, I've checked that all the vacuum hoses are ok so I'm inclined to believe that I may have an issue with the water temperature sensor.

 

For the want of £15, I've ordered up a new temperature sensor (and gasket) which I'll pick up and fit tomorrow, but just wanted to know if you think I'm barking up the right tree?

 

Many thanks,

 

Richard.

[bpirie1000]

How long has the car been sitting? I would also suggestthat it may need a longer drive to the mot test station. Keep the revs high and get the cat all hot and burn off the carbo built up.

I would also think about testing the tollerances of the lambda sensors.

[RWD3M]

How long has the car been sitting? I would also suggestthat it may need a longer drive to the mot test station. Keep the revs high and get the cat all hot and burn off the carbo built up.

I would also think about testing the tollerances of the lambda sensors.

Hi, and thanks for the reply.

 

It hasn't been sitting long, however!!! it has only done about a hundred miles since the last MoT (yes, I know, shameful).

 

The run to the MoT station is about 15 minutes along pretty deserted roads so I am able to apply the Italian tune-up!

 

I am interested in the Lambda sensor testing, can you tell me more?

 

Richard.

[bpirie1000]

have a look at this..

https://youtu.be/Fl3aD1qJrEg

[RWD3M]

FWIW, I got to the bottom of this yesterday after fitting new water temp and ambient air temp sensors. The idle control valve was all gunged up. So a good clean and normal service has been resumed.

 

Thanks to those that offered advice.

 

Richard.