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[Roland]

:roll:

[Nosebolt]

I had a similar problem with a tuned, de-cated Ford Escort, the tester (a mate) put diesel additive in the (petrol) tank and it passed, I don’t know how or why it worked but passed every year till I sold it  

[PtP]

Have a look at this link: http://www.pureenergysystems.com/news/2 ... 69_Acetone

[keeko]

My last XJ scraped though its first MOT in my ownership. Borderline was the words used. New cat as well! A year later after taking the advice of the MOT tester I took the Jeep for a good hard run giving it a bit of a caning (about half an hour) and took it straight in and it passed a lot easier than the year previous.

[gordy]

I had my MOT yesterday..oh what fun.....Everything was going great, heading for a straight pass, final thing to check was the emergency handbrake, I heard a bang..........the geezer pulled the lever so hard the bullit on the end of the cable got ripped thru it's locating hole.  Initially we both thought the cable had snapped, so after a frantic 50 mile round trip to Lighthouse Jeep (thank goodness these guys are local lol), to get a new cable, upon dismantleing I discovered what happened.

I suspect over the years poor rear brake maintenance had lead to pulling the lever up hard to ensure the vehicle is secure.  Each time the bullit has dug a little more into the locator, until yesterday, one good pull and it slipped thru.  Sorted now and I got the green certificate.

In away it's good it happened, TWICE last year a vehicle's e-brake failed nearby and rolled, killing a pedestrian.

Makes ya think dont it.

[Roland]

Does anyone know, is there a given value or is it up to the MOT guy's discretion if a car passes on CO2 emission?
After 2 week in the garage and fitting new exhaust parts and cat £ 600+ " ... the MOT guy is still unhappy"
Any ideas?

[Dave69]

there is set limits for emissions from cars, a bit of a pain to find exact figure rather than just proceedures but here is some general information which is a good starting point. taken from the second web link

http://www.motuk.co.uk/manual_730.htm

http://www.bobmckay.co.uk/p_emissions.html

From 1st August 2001 a simplified emissions check was introduced and this will be carried out on vehicles prior to doing a full "CAT" test. If the vehicle meets the requirements during this BETs (basic emission test) then it passes. There will be no need to measure the engine temperature using the analyser probe but the vehicle must be at normal running temperature. However, engine rpm will still be measured. If the vehicle fails the BET then the full "CAT" test is applied.

The BET standards are:

Fast idle 2500-3000rpm

CO no more than 0.3%

HC no more than 200 parts per million

Lambda between 0.97 and 1.03

Normal idle 450-1500rpm

CO no more than 0.5%

#  First used before 1/8/1975 - Visual test only. Failure for excess idle speed, dense blue or black smoke for 5 seconds at idle or during acceleration  up to 2500rpm or half engine max speed whichever lowest.
# First used between 1/8/75 and 31/7/86 - meter test CO <=4.5%, HC<=1200ppm.
# First used between 1/8/86 and 31/7/92 - meter test CO<=3.5%, HC<=1200ppm.
#

First used between 1/8/92 and 31/7/94 - advanced emission test (CAT) if its running on petrol when presented, to the vehicle specific limits usually around CO<=0.3%, HC<=200ppm and Lambda 0.97 - 1.03.  Remember from 1st August 2001 a basic emission test will be carried out initially.

Basic fault finding for advanced emission test failures:

   1. If a vehicle fails for high CO at idle and /or fast idle then.... if Lambda is too low, the mixture is too rich. This can be caused either by a misfire or by a faulty Lambda sensor. If it's running very rich, the 02 and HC will be higher than normal.
   2. if it has a high Lambda and high 02 (0.5 to 1.5%), the "CAT" could be faulty. Before condemning it make sure its hot enough to work, the Lambda and other sensors are working OK and the exhaust downpipe hasn't got any leaks.
   3. if the vehicle fails for high HC then ...if the CO passes, the vehicle is probably misfiring. Or if the CO fails and the Lambda reading is too low, the mixture is probably too rich and it may also be misfiring.
   4. if the CO fails, the Lambda reading is high and the O2 reading is high (0.5 to 1.5%) the "CAT" could be faulty. Again check out the simple measures above before condemning it.
   5. if the Lambda fails then...if its too high the Lambda sensor may be faulty, the mixture may be too weak or there may be a hole in the exhaust downpipe.  If Lambda is too low the sensor may be faulty, the mixture may be rich or the vehicle may be misfiring.