MOT Emission level for UK Subaru-Any MOT testers about?
MOT Emission level for UK Subaru-Any MOT testers about?
Hi
I need to know what at what level of emmision is permited to pass the MOT.
(The stuff below is from the MOT website but doesn“t give a fail percentage)
If a vehicle has a dual exhaust system, then the emissions from the tailpipes should be averaged. This is done by adding together the readings and dividing by two, eg
CARBON MONOXIDE
1st pipe emits 6% CO, 400 ppm HC
2nd pipe emits 4% CO, 500 ppm HC
Average CO reading is
6+4/2=5%
HYDROCARBONS
Average HC reading is
400+500/2=450ppm
So.....
1. Is it just Carbon Monoxide and Hydrocarbons that are measured during the MOT
2. Are they always measured in % for Carbon Monoxide? And what is the fail percentage?
3. Hydrocarbons are these allways measured in ppm? And what is the fail figure?
4. What is ppm short for?
5. Is there a test for noise level during the MOT?
The car would be a facelift late UK classic.
Alternatively has anyone got a MOT sheets that list the perameters of pas and fail - for this and anything else that is usefull.
This info would really help me out - so replies much appreciated
Thanks
Steve
I need to know what at what level of emmision is permited to pass the MOT.
(The stuff below is from the MOT website but doesn“t give a fail percentage)
If a vehicle has a dual exhaust system, then the emissions from the tailpipes should be averaged. This is done by adding together the readings and dividing by two, eg
CARBON MONOXIDE
1st pipe emits 6% CO, 400 ppm HC
2nd pipe emits 4% CO, 500 ppm HC
Average CO reading is
6+4/2=5%
HYDROCARBONS
Average HC reading is
400+500/2=450ppm
So.....
1. Is it just Carbon Monoxide and Hydrocarbons that are measured during the MOT
2. Are they always measured in % for Carbon Monoxide? And what is the fail percentage?
3. Hydrocarbons are these allways measured in ppm? And what is the fail figure?
4. What is ppm short for?
5. Is there a test for noise level during the MOT?
The car would be a facelift late UK classic.
Alternatively has anyone got a MOT sheets that list the perameters of pas and fail - for this and anything else that is usefull.
This info would really help me out - so replies much appreciated
Thanks
Steve
Scooby Regular
Joined: Oct 2005
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If this is any help, If your car fails the emmisions by a small amount and the testing station will let you turn on all the car electrics, lights rear window heater,fan etc, this pulls power from the ecu and makes the makes the managment of the engine less precise!, try it!
Scooby Regular
Joined: Jun 2000
Posts: 32,398
Likes: 1
From: Old Codgers Home
If this is any help, If your car fails the emmisions by a small amount and the testing station will let you turn on all the car electrics, lights rear window heater,fan etc, this pulls power from the ecu and makes the makes the managment of the engine less precise!, try it!
Absolutely BRILLIANT!!
Pulls power from the ECU
Not from the Battery then? I am in tears here - funniest thing I have heard in years
CLASSIC!!
Scooby Regular
Joined: Feb 2007
Posts: 400
Likes: 0
Many engine management systems implement part of the idle stabilisation algorithm by advancing the ignition timing when load is increased. So increasing the load on an idling engine causes the timing to be advanced slightly and this can slightly reduce the emissions.
Not sure if this is how Subaru do it - but its quite likely.
Not sure if this is how Subaru do it - but its quite likely.
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