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[webby23]

My sister took her W reg Astra in for an MOT yesterday (Friday) but sadly it failed on Emissions.

Any ideas what could be wrong with it based on the results given below?

Many thanks in advance for any advice given.

Martyn

                                               Limits              Actual Values             Results

Engine Oil Temp                       Temp gauge shown warm

 

1st fast idle test

Engine RPM                             2750/3250       Manual check               Not tested

CO% Vol                                 0.30                 0.54                             Failed

HC ppm Vol                            200                  133                              Pass

Lampda                                    0.91/1.03         0.99                             Pass

 

2nd fast idle test

Engine RPM                             2570/3250       Manual Check              Not tested

CO% Vol                                 0.30                 0.28                             Pass    

HC ppm Vol                            200                  119                              Pass

Lamdpa                                    0.97/1.03         0.99                             Pass

 

Natural Idle test

Engine RPM                             730/990           Manual Check              Not tested

CO% Vol                                 0.50                 0.67                             Fail

 

Overall results                                                                                    Test Failed

[Ian_D]

What type of driving does your sister do? Small local trips to shops?

If so, I would take it out for a good long thrashing! This should warm the CAT right up, which often bring them back to life!

Other than that, give it a service (Oil + Air Filter, and maybe Spark Plugs depending on age / condition).

Also check for any airleaks / exhaust leaks as this can/will effect emissions!

HTH

[webby23]

Mostly tootling around I think mate, definately doesnt rag it about......

To my untrained eye just looks like the CO is too high.......Does that just mean that the filters could be dirty?

Will find out later on when was its last service if i can

Thanks

 

[Marks DTM Calib]

Isit getting upto temp.....could be stat stuck open.

Is she local, can do a quick T2 session on it for her.

[dad1uk]

The CO2 is not that far out, I always add a petrol addative about a week before the test and change the oil and filter and air filter, and give it a thrashing up the motorway the day or the day before the test.
If the car has just pootled about town, then a thrashing could well sort your problem.
Good luck!

[webby23]

Isit getting upto temp.....could be stat stuck open.


Is she local, can do a quick T2 session on it for her.

She did say that the tester reckoned it was "running rough" and rich

Temp showing on test result as warm, but trying to contact her now and her blinking phone is off


Shes in Leicester Mark

Not sure if it is allowed on the road though failing its mot before the old one ran out?

 

[webby23]

from her email last night

"Attached is a copy of the emissions test. The tester also said that the engine sounds like "its running rough" and "running rich" due to the amount of unburnt fuel coming through the exhaust emissions"

[Marks DTM Calib]

Isit getting upto temp.....could be stat stuck open.


Is she local, can do a quick T2 session on it for her.

She did say that the tester reckoned it was "running rough" and rich

Temp showing on test result as warm, but trying to contact her now and her blinking phone is off


Shes in Leicester Mark

Not sure if it is allowed on the road though failing its mot before the old one ran out?

 

Its MOT'd until the date of the last certificate....so its still covered.

[Christian]

Looking at it ide say Oxygen sensor?

[Marks DTM Calib]

Looking at it ide say Oxygen sensor?

Nah.....hardly ever is.

I would guess coil pack failing or stat stuck open

[HGV mechanic]

i would try,, cleaning throttle body, and evap system , also blow out/change air fitler  /check MAF sensor and genrally a good service with some redex and a good drive
wouldnt think it would be stat as it passed 2nd fast idel

[Marks DTM Calib]

i would try,, cleaning throttle body, and evap system , also blow out/change air fitler  /check MAF sensor and genrally a good service with some redex and a good drive
wouldnt think it would be stat as it passed 2nd fast idel

Barely....after having a good long rev.

Its one to check, T2 will also allow us to see what temp the instruments and ECU think the water is  

[webby23]

The car was allegedly fully serviced a couple of weeks ago so will be expecting to see new sparkies and filters in it when the brother in law brings it up here tomrw

[HGV mechanic]

let us know