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Post by newguy on Nov 5, 2012 21:10:59 GMT
Hi, can anyone help me with info on the correct procedure to do a smoke test on these 2009 reg cars,,,had 2 vws in for test and could not get any results,,,,FAS NOT DETECTED,,,,, Ive asked a couple of testers i know but not really any help, advised to write on emission print out that no visible smoke !! My smoke meter is bradbury,,latest model ,5month old atl. Thank you.
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Post by manautos on Nov 6, 2012 18:19:36 GMT
If the DSM does not register a reading or shows an error, the printout should be marked accordingly showing that the emissions limits were tested and met but the DSM could not register the reading. If the DSM will not produce a printout then the tester must make a written note of the following: - · Test Station number · Testers name · Date & time · Test number · Vehicle Type · Vehicle VRN · That the vehicle passed the emissions test · No print out was produced due to low emissions. This information must be recorded and kept with the emissions records for audit purposes for 3 months
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Post by martin243 on Nov 6, 2012 22:35:44 GMT
Use the rev counter when u do the test
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Daveg
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Post by Daveg on Nov 6, 2012 22:37:01 GMT
I think it is probably time VOSA updated that lot, the VT40 printout has all that info present, and the only thing to do then is write on the VT40 that the diesel emissions were too low to produce a printout. It is right what has been previously said I am not knocking it, I just think VOSA need an update to reduce the writing. An advisory in the VTS device to automatically print would be nice. Daveg
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ste
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Post by ste on Nov 7, 2012 8:37:48 GMT
you could put a manual advice note on the mot cert,
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Post by newguy on Nov 7, 2012 8:48:19 GMT
Thanks, Martin, i take it you mean the rev counter sensor on the machine,,,,mine doesnt seem to have the bit that reads diesels,and only works on some petrols [ bradbury 1511], one of the local garages says that theirs does but i dont know.they have different machine. these cars only reved to about 2200rpm flat out.
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Post by martin243 on Nov 7, 2012 20:13:28 GMT
We have a Crypton machine, works off the battery and records RPM on both petrol and diesels well.
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afi
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Post by afi on Nov 7, 2012 21:18:43 GMT
have a braDBURY SMOKE MACHINE 18 MONTHS OLD, WE PRESS THE ABORT BUTTON THIS GIVES A PRINT OUT WITH THE READING 0.
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Daveg
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Post by Daveg on Nov 8, 2012 12:43:07 GMT
We have a DGA and it sits there looking at you saying put the probe in the exhaust tail pipe
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nitros44
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Post by nitros44 on Nov 9, 2012 14:53:30 GMT
Ours says NO ACCELERATION detected !! TRY AGAIN? It maybe worth mentioning that the bonnet,boot and doors need to be closed during the check and also press and release the clutch before operating the accelerate pedal if the engine only revs to 2500 or 3000 rpm It does not work all the time,but you maybe surprised
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Daveg
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Post by Daveg on Nov 10, 2012 18:41:28 GMT
Not much surprises me in the trade anymore ;D Even my boss does not surprise me Daveg
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kjb
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Post by kjb on Nov 14, 2012 17:45:55 GMT
latest software on DGA allows you to use battery connections as per petrol engines,so senses rpm,but no emissions of note
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wkg
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Post by wkg on Nov 28, 2012 8:15:44 GMT
hello all You will find a lot of the newer diesels will not rev above 1800-2000rpm and the old clutch trick will not work. Emission testing will have to be checked through diagnostic socket in the future I suspect.
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nitros44
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Post by nitros44 on Dec 4, 2012 22:55:27 GMT
Yes it has been mentioned that the clutch trick does not always work,but its best to try it rather then just take it for granted that it will not,personally i would rather have a emissions print then nothing,but that's down to the equipment we have.
The currant engine management systems are a long way off becoming the the answer to emissions testing as far as heavy oil is concerned. It will get to the point as its already been stated it will at some stage just be visual
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phaetonott
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Post by phaetonott on Dec 12, 2012 20:43:49 GMT
You say it may become visual Nitros, but have you noticed that some cars get a fast pass despite filling the workshop with smoke, while others look quite clean and struggle to pass?
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Daveg
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Post by Daveg on Dec 12, 2012 22:51:10 GMT
Yes it has been mentioned that the clutch trick does not always work,but its best to try it rather then just take it for granted that it will not,personally i would rather have a emissions print then nothing,but that's down to the equipment we have. The currant engine management systems are a long way off becoming the the answer to emissions testing as far as heavy oil is concerned. It will get to the point as its already been stated it will at some stage just be visual I am pondering over why you said this Nitros The currant engine management systems are a long way off becoming the the answer to emissions testing as far as heavy oil is concerned.With modern closed looped feedback systems either petrol or diesel I thought it could be possible to plug something into the 16 PIN socket and read off what the sensors are doing no? We all know that most diesels when they fail the emissions test anyway is only because of soot build up in the exhaust, so if the system is functioning correctly and there was a more efficient method of assessment, which I am reasonably sure there is, why not use it and save some expensive engine damage ;D Daveg
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ste
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Post by ste on Dec 19, 2012 15:37:30 GMT
is there any need to plug in, normal if there is a problem a M.I.L illuminates, granted it may still pass an emissions test if this is on
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nitros44
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Post by nitros44 on Dec 19, 2012 23:10:14 GMT
A diesel engine in good condition should produce no visible smoke from the exhaust, under most operating conditions. A short puff of smoke when an engine is accelerated under load may be acceptable, due to the lag before the turbocharger speed and air flow is able to match the volume of diesel injected into the cylinders. That would only apply to older technology diesel engines, but with modern type diesels, no smoke at all should be evident. In my opinion the only way is to stick with the present system with DSM rather then having test stations having to fork out money for diagnostic equipment. Just because a engine malfunction lamp is not illuminated or nothing comes up on the diagnostic 16 pin tool,does not mean all is good. I think the best way is still using the DSM,that way what comes out the exhaust and gets measured is a true reflection on the condition or the quality of the combustion process. This week i have tested 11 diesels 2008 onwards and 10 of them all recording no smoke detected on the DSM,the other one was a Citroen c4 2006 which failed,well it would its french The problem with some diesels is the primitive fuel systems delivery is crap,but the clamp down on pollution and stricter limits on smoke emissions might just see a change in the way we test diesels.
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Daveg
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Post by Daveg on Dec 20, 2012 20:48:19 GMT
In my own opinion I think the best way is still using the DSM,that way what comes out the exhaust and gets measured is a true reflection on the condition or the quality of the combustion process.I was not entiry convinced that the above was the best method as there is so much soot build up in the exhaust system that until the soot is cleared a true reading of the mean K value being produced cannot be established. The latest vehicles with their super clean exhaust systems will in my opinion only stay clear so long as the punters are willing to pay for the expensive pig pea that is periodically injected into the main gas/soot stream that enters the DPF to keep the soot levels so low, which even on some modern latest vehicles that don't use it were the limit is 1.5 now, they are already failing the test producing reading that are just like normal diesels. Just my tuppence worth LOL ;D Daveg
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phaetonott
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Post by phaetonott on Dec 20, 2012 22:24:16 GMT
Yes Dave £80 a litre. Our guys did a Cmax that smoked its way to a fail. Took them about an hour as well, not just a case of pour it into a reservoir.
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