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Old 12-07-2018   #16
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Re: JTD Emissions

Quote Originally Posted by cris1117 View Post
Thatís exactly why it failed the emissions test; the first couple of hard revs will blow lots of soot out of the exhaust, after four or five hard revs it will blow clean.
Ok thanks, I'll make sure I get it nicely blown out before I arrive for the retest.
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Old 12-07-2018   #17
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Re: JTD Emissions



The testers won’t rev it hard enough because they don’t know if the cam belt has been maintained properly and are frightened of snapping it.


I usually do mine at least five times on the way to the test centre no one behind in to neutral and rev it hard just for a second, clouds of black smoke. It’s also a neat way to get rid of tailgater’s car full of fumes,they soon back off.


The car has a rev limit that it won’t exceed so providing the car is properly maintained it can’t damage the engine.


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Old 13-07-2018   #18
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Re: JTD Emissions

Quote Originally Posted by Artermis View Post
A common 'trick' now being employed by a lot of the BMW / MG / Rover gangs running the rubbish 2.0 diesel found in the e46 generation ZT / 75 rovers is that they are putting a piece of electrical tape over the emissions value on the chassis plate.
Just wondering if its allowable to put a 'cover' over ones VIN plate which hides it? From what I've been reading, it needs to be visible to an MOT tester, is this correct? I guess covering the emissions value only is OK-ish as long as the tester can see the identifying details?
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Old 15-07-2018   #19
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Re: JTD Emissions

So I took my car for the retest yesterday, to get the emissions down I changed the oil and filter, gave it a new air filter, and replaced fuel filter. I also added some additive. I got it nice and hot before I arrived, and when we did the emissions test, the end result was 0.74 1/m, down from 2.11 1/m and well under 1.34 1/m on the chassis plate Nice to know it is achievable to get under the threshold, thanks for all the tips.
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Old 16-07-2018   #20
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Re: JTD Emissions

My old beast managed 1.46 last year... so it'll be an interesting MOT for him in December..


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Old 16-07-2018   #21
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Re: JTD Emissions

I suspect that just running through some diesel additive would have been enough in my case, but to be fair it was almost time for a service, so it made sense to do it as well.

I've never had a vehicle fail on emissions before, so I've never had any previous experience in what the numbers mean, and how much you could feasibly expect reduce the emissions with additive/service.

When yours does go for a test, it would be interesting to see what values you get if you don't mind sharing them.
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Old 16-07-2018   #22
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Re: JTD Emissions

Last MOT on each of my JTDs, both with about 135,000 miles, one was 0.28, the other 0.72.

I always change the engine oil and filter, and get the engines hot before going for the test. Very seldom change the air filters though, and don't use any additives.
.

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Old 16-07-2018   #23
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Re: JTD Emissions

Quote Originally Posted by Davren View Post
Last MOT on each of my JTDs, both with about 135,000 miles, one was 0.28, the other 0.72.
Wow, that seems very good, almost cleaner than an electric car lol! I've never run an additive through mine before, so I had no idea what effect it would have. I think its probably done it some good though, it seems slightly more responsive, but I recently cleaned out the boost solenoid valve and that made quite a difference too. My EGR was blanked for some time, but that was all cleaned up and put back to standard before this MOT. I keep the car relatively well serviced. Any idea as to why my emissions were so high on my first test? Maybe it was just a case of not being hot enough then?
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Old 16-07-2018   #24
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Re: JTD Emissions

I'd guess the blanked EGR is likely to increase emissions.

Dragging the gas through the combustion chamber again heats the inlet charge and also gives any loose CO another go at being burnt.

I'll make some home-brew fuel system cleaner if my new shed is completed on time (can't be storing industrial quantities of ingredients aka "flammable ****" under the stairs... ). If it's ready in time, I'll feed Gerrard a few tanks' worth, otherwise it's Cataclean and run it on Super diesel for a week or two before the test.

My EGR is bypassed, so I have some prospects to get cleaner there (even at the expense of some performance)... but my MAF, MAP and boost valve are all less than 2 years old and the beast runs very well, so not much change available there, I think.


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Old 17-07-2018   #25
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Re: JTD Emissions

I'd say about 50% of the emissions difference were low engine/cat temperature, then 25% not running it hard enough(to clear sooth from the exhaust) and the other 25% oil&filter.
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Old 17-07-2018   #26
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Re: JTD Emissions

Quote Originally Posted by Ralf S. View Post
I'd guess the blanked EGR is likely to increase emissions.

Dragging the gas through the combustion chamber again heats the inlet charge and also gives any loose CO another go at being burnt.

I'll make some home-brew fuel system cleaner if my new shed is completed on time (can't be storing industrial quantities of ingredients aka "flammable ****" under the stairs... ). If it's ready in time, I'll feed Gerrard a few tanks' worth, otherwise it's Cataclean and run it on Super diesel for a week or two before the test.

My EGR is bypassed, so I have some prospects to get cleaner there (even at the expense of some performance)... but my MAF, MAP and boost valve are all less than 2 years old and the beast runs very well, so not much change available there, I think.


Ralf S.

Blanking an EGR will increase NOx emissions but those are not tested for the MOT. EGR actually reduces the combustion temperature.



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Old 18-07-2018   #27
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Re: JTD Emissions

Hmmm... food for thought.

My beast is due a service in a few weeks so I'll be fitting a new air filter as part of that.

Is a thicker oil going to be better for emissions? The beast has 5W40 in it... but maybe 10W40 might stay behind the rings marginally better..? I have no oil consumption at all... (less than 1 litre between 12,000 mile services).

I might also clean out the inlet manifold and MAP sensor too. Do we think squirting it with contact cleaner will do the job, or does it need more? My old one was full of oil (overfilled oil level flooded the inlet manifold a bit, so I just changed it).

What's the verdict on the EGR (for CO)? Leave it blanked or return to Fiat spec'?

Does the lambada sensor do anything for emissions? Mine is 3 years old (fitted just before I bought it) so no reason to think it's losing it's abilities.

My MAF and boost valve are less than 2 years old and also working spot-on (touches wood) as far as I can tell.

I half fancy the beast's chances at 1.46 but it'll be emissions that kills it rather than something corrosion or mechanical...

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Old 18-07-2018   #28
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Re: JTD Emissions

It will be fine, service it(oil & filters), run it hard and that should be it.
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