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1.6 hdi lumpy cold start - SOLVED!
#91
Cool cheers mate.  Wink
My Van: 2007 1.6 HDi 600 - currently on 62,000 miles  Sleepy
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#92
So far as I can see from the following link, all that's tested is the smoke level / opacity on diesels. I can't see any references to NOX levels. There are no mentions of using diagnostic equipment to check for fault codes, so as long as you (unlike me) don't have the EML on you should be fine.

https://www.mot-testing.service.gov.uk/d...ection_8.2

Just had a look at my last year's MOT emissions tests results, no references there either about CO2 or NOX. I don't think this year's test will be any different from what I read in the link above.
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#93
Excellent, you should get the blank fitted and the EML cleared as it doesn't care about the EGR flow.
My Van: 2007 1.6 HDi 600 - currently on 62,000 miles  Sleepy
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#94
(16-07-2018, 07:44 PM)Zion Wrote:  Excellent, you should get the blank fitted and the EML cleared as it doesn't care about the EGR flow.

Unfortunately, I think certain versions of the 2.0 (Siemens) ECU have different programming and throw up the EML or go into limp mode when it gets unexpected EGR values. I did some investigation yesterday but have a duff MAF which is causing it's own issues. I'll start a 2.0 thread on this subject when I have my MOT sorted, hopefully next week.
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#95
I've now put 400 miles on it with the EGR blank fitted, and it runs better than ever, perfect in fact.
My Van: 2007 1.6 HDi 600 - currently on 62,000 miles  Sleepy
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#96
Thanks again for this thread. I've done about a thousand miles (700 of those towing) since fitting the EGR blank, as part of the job of changing the fuel rail pressure sensor. I still get the odd puff of smoke on startup but the cold start lumpiness has pretty much gone. Fuel economy, while towing at least, has improved by about half an mpg. Unless I bladder it and want to get home sharpish.
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#97
Yeah if I'm being picky, there's a slight wobble in the idle occasionally now but it's very slight and disappears in seconds. That may be due to the age of the MAF, while the little heater gets up to temp in the measurement element. The MAF is a hot-film type, using the cooling effect of the air to measure the flow. To do this, a small heated resistor is brought up to a known temperature, then the air force cools it so the ECU knows the flow from the reduction in temperature, therefore it will measure more flow for a few seconds while it builds up heat in the resistor, so the ECU injects more fuel than necessary for the actual volume, hence the puff of smoke and the wobble in the idle. The EGR obviously makes it a lot worse by sending in sooty air and unburnt fuel while the engine is cold. That will also be why cleaning a hot-film MAF has no effect, as the resistor has aged and it's value changes, so the heating effect of the current takes a little longer.
My Van: 2007 1.6 HDi 600 - currently on 62,000 miles  Sleepy
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#98
(22-07-2018, 11:19 AM)Zion Wrote:  Yeah if I'm being picky, there's a slight wobble in the idle occasionally now but it's very slight and disappears in seconds. That may be due to the age of the MAF, while the little heater gets up to temp in the measurement element. The MAF is a hot-film type, using the cooling effect of the air to measure the flow. To do this, a small heated resistor is brought up to a known temperature, then the air force cools it so the ECU knows the flow from the reduction in temperature, therefore it will measure more flow for a few seconds while it builds up heat in the resistor, so the ECU injects more fuel than necessary for the actual volume, hence the puff of smoke and the wobble in the idle. The EGR obviously makes it a lot worse by sending in sooty air and unburnt fuel while the engine is cold. That will also be why cleaning a hot-film MAF has no effect, as the resistor has aged and it's value changes, so the heating effect of the current takes a little longer.

Hi - you've just described the symptoms that ours still displays, never mind the weather - hot or cold - it wobbles just as you describe. Last MoT (March) sailed through the emissions so nowadays we just live with it now. Bit of smoke at startup and that's it.

The 1.6 HDi is a decent engine - very pleased with it (previously had a 206 with the 1.4 HDi and that was a tad underpowered)
                                                                                                                                                                                             
Our car - 2008 1.6 HDi 92 Multispace. 151,000 miles + counting. 16,000 + miles in our care. 48.88 mpg ave in that time
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#99
Mine was terrible when cold before I fitted the EGR blank, it's near perfect now. The MAF age will be the last piece of the puzzle.
My Van: 2007 1.6 HDi 600 - currently on 62,000 miles  Sleepy
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