18 replies to this topic

[mintom]

Does blanking the EGR with a solid plate (2mm ish) cure the smoke?

 

Double check the actuator arm moves fully to the front and rear with no

resistance at all.

 

I've only run with the vacuum on the EGR disconnected so far on new EGR (assumption closed), and that was a massive difference. 

Reckoning there will be some build up of carbon on the variable vanes. Each time I've taken the clip off yesterday and today it's moved well enough end to end. Don't doubt it's needing cleaning.  It's on the list of things to do after MOT pass.

Will get a chance to measure boost / fuel pressure / rpm and share that tomorrow.

[mintom]

 

What fuel pressure and boost pressure are you getting whilst parked.

 

Values whilst parked at idle, 2000, 3000 and 4000 rpm..

 

 

These are the values from ForDiag

\

On the drive the EGR didn't close until >3500rpm.

EGR% I didn't get a lot of use from.

Which of the tools (ForDiag / ForScan) is better for drive logging?

Edited by mintom, 27 June 2019 - 08:36 PM.

[mintom]

Adding a note. The test on the drive was with the original EGR.

[mintom]

Final test of the evening.

 

Drive test with EGR vacuum attached.

smoke in the expected places.

Heavy acceleration from low revs, plume of black.

Still some smoke (grey) with less but spirited acceleration

 

Drive test with the EGR vacuum detached.

No smoke. nothing. nada. whatever I threw at it. @[email protected]

Edited by mintom, 27 June 2019 - 09:14 PM.

[PURPLE_2L_LX]

EGR should be closed by 4000rpm even whilst parked, yours is still open slightly.

 

Boost pressure is low, I thought mine was lower than Marks because his was tuned

but it was down to my vanes starting to stick.

 

 

Yeah the EGR duty% is odd.   46% = 3.3mm,   47% = 3.9mm and 27% = 0mm (closed)

those are my old figures from my 2004 car.

 

 

Fuel pressure appears to be out by a factor of 100x..

 

For logging whilst driving i still prefer the old Formidable (F-Super) which is not the same

as the ELM F-Super that runs Forscan etc.

[mintom]

Thanks. Food for thought. The 100x out and some of the values..  I'm putting this down to my unfamiliarity, and reading the gauges on ForDiag.  Will try the other tools at hand for better readings.

[PURPLE_2L_LX]

At least the figures make sense being 100x out, would have been worse if the

figures did not match.

[mintom]

Well... happy to say, eventually got through the MOT.

 

I'd spent some of the weekend just going around and making sure I had everything cleaned (EGR / Inlet manifold - squeaky clean gasket surfaces etc)

After spending two weeks without a car, using public transport the whole time, and having to cancel a weekend social arrangement, had a local diesel garage lined up to do some pre mot smoke test, and point out anything else to give me the best chance to get through the emissions. I got a compliment from them that injectors / pump / general state of engine good. They recommended a good carbon clean. They'd added Cataclean (I had no prior experience of) and after a spirited drive they told me this had brought the smoke down a fair bit. 

MOT station guys did some pre-emissions testing too to give it a good chance on the re-test (each iteration of test the smoke dropped).

 

Down to the wire on the re-test time limit.

Next time we prepare well in advance for possibility of emissions test fail. No nasty surprises.

[mintom]

one more note. I stuck with the original EGR. The reasonably priced replacement I'd bougt didn't seem to have the same opening and closing vacuum thresholds.  Additionally, I refitted the bypass plate with the hole for EURO 4. At MOT retest it was a lucky feather, based on a conversation I'd had earlier in the day and that the best emissions figure I had achieved had still not quite made the grade.