Emissions MOT failure

[gchild]

Hello,

My P REG e230 failed its MOT due to emission levels? what does this mean? the engine needs work/tune up, or exhaust issues? I recently had a new cat 6months ago, could this be the cause?

 

[pluggers]

Just a guess. Might need an 02 sensor and a tune up?

 

[PJH]

Hello,

My P REG e230 failed its MOT due to emission levels? what does this mean? the engine needs work/tune up, or exhaust issues? I recently had a new cat 6months ago, could this be the cause?

How badly did it fail and on what, HC or CO2 ?
How long had the engine been running before the test ?
The owner of the test station I use has told me that if they have an 'emissions failure' he tells the car owner to '...run it up the A12 for 15 mins and come back....' They re-test the car and it passes.
See end of this thread Cat Cleaning Additive

 

[Ian B Walker]

I was advised to give my car a good run before an MoT, clears out the cat and exhaust. Seemed to work for me

 

[jgevers]

What are the co, hc, o2 and lambda figures on idle and fast idle. If you post these I might be able to point you in the right direction.

regards,

Job

 

[lil.smartie]

New air filter could help if it's only a bit over!
Kate

 

[gchild]

Specific details are:

Fast Idle - c0 fail 0.4% vol
Second Fast Idle - c0 fail 0.43% vol
Natural Idle - c0 fail 0.52% vol
Overall exhaust emissions test fail

HC, lambda passed each time

So what should I do:
- give the car a good warm up
- stick some premium fuel in
- would engine oil make a difference
- change the air filter
- all of the above

Cheers

 

[PJH]

Specific details are:

Fast Idle - c0 fail 0.4% vol
Second Fast Idle - c0 fail 0.43% vol
Natural Idle - c0 fail 0.52% vol
Overall exhaust emissions test fail

HC, lambda passed each time

So what should I do:
- give the car a good warm up
- stick some premium fuel in
- would engine oil make a difference
- change the air filter
- all of the above

Cheers

Don't know about the oil.
I use BP ultimate for a week before the test. But do make sure you take the car for a run before the re-test. Don't let it sit in the garage car park getting cold.

 

[Dieselman]

Specific details are:

Fast Idle - c0 fail 0.4% vol
Second Fast Idle - c0 fail 0.43% vol
Natural Idle - c0 fail 0.52% vol
Overall exhaust emissions test fail

HC, lambda passed each time

So what should I do:
- give the car a good warm up
- stick some premium fuel in
- would engine oil make a difference
- change the air filter
- all of the above

Cheers

The output shows a rich mixture but really I think the actual Lamda value is required to show whether it's the fuel mixture or the Cat.

 

[gchild]

The output shows a rich mixture but really I think the actual Lamda value is required to show whether it's the fuel mixture or the Cat.

Lamda values below:

Fast Idle - c0 fail 0.4% vol
HC 33 ppm vol pass
lambda - 1.010 pass

Second Fast Idle - c0 fail 0.43% vol
HC 18 ppm vol pass
lambda - 1.001 pass

Natural Idle - c0 fail 0.52% vol
no lamda value


Any ideas Dieselman???

 

[Dieselman]

The mixture is controlled by the ECU and Lamda sensor so shouldn't be adjustable.

Before doing anything I would give the injectors a strong dose of injector cleaner and the car a good thrash.

The engine and valves are in good fettle judgiing by the low Hc reading.

 

[gchild]

Thanks for the help people. Finally got through the MOT. Went for a good drive with a tank of premium fuel, done the trick...