Hmm. Need a larger pic..... can’t get enough detail....:
Where’s This Bit From? . . . . Tonight’s Quiz
- Thread starter Dellmassive
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China??Hmm. Need a larger pic..... can’t get enough detail....:
Wouldn't be Germany surely.
Tag on the edge of some sound deadening ?
Well, not exactly a bit, rather T6 diesel behaviour - every now and then.
T6. Engine hot. Starts when vehicle has reached standstill. Engine on tick-over - 830 RPM. Stop/start doesn't shut off the engine.
Sound clip attached - a "hiccup" regularly every 1.5 seconds. Can last up to two minutes. Recording made outside. Best heard on right side of vehicle (standing by right front wheel). Can be heard in cabin, too.
View attachment T6_CXEB_Hiccup_20181213.mp3
T6. Engine hot. Starts when vehicle has reached standstill. Engine on tick-over - 830 RPM. Stop/start doesn't shut off the engine.
Sound clip attached - a "hiccup" regularly every 1.5 seconds. Can last up to two minutes. Recording made outside. Best heard on right side of vehicle (standing by right front wheel). Can be heard in cabin, too.
View attachment T6_CXEB_Hiccup_20181213.mp3
Where’s This Bit From? . . . . Tonight’s Quiz - 060621
A,B,C,D - answers below -please.
A:
B:
C:
D:
A. Little trap door in bumper that hsa an alien with a water pistol behind.
B. Part of the trim in the headlining with the mic behind? I cant check :/
C. Drain in bottom of tailgate.
D. Door catch
B. Part of the trim in the headlining with the mic behind? I cant check :/
C. Drain in bottom of tailgate.
D. Door catch
What he said.
Not 100% correct so far......
I think Im not least sure about 4, and think its the barn doors so cant check coz I've only had tailgate
Well I can see the EGR valve is cycling for some reason at tickover, all other values on your display seem to correlate this.
From what I understand the EGR valve is motor driven so the noise is not from a vacuum valve
Actually is D the barn-door catch?
I was guessing at that, as I've never really looked at one. Tailgates ftw lol.
Hah. I’ve had one, then the other, so should know! But as it was @Dellmassive’s van, which is BD, I thought it would be the better guess!
Thank you very much for the interest
Actually I don't have definite answer so explanations, opinions, ideas... all are welcome.My thought about the phenomena is that the engine is doing a kind of EGR calibration. As the EGR cooler gradually gets clogged, EGR needs to be adjusted accordingly to maintain optimal combustion conditions.
Below a zoomed out version of the recording above - but just two parameters (EGR closure vs. air flow)
So basically EGR is kept closed 0% (no exhaust recirculation) for 2 seconds (') thus cylinders are filled with fresh air (approx. at rate 16.9 g/s). Then EGR is quickly opened (to 40%) which reduces the "fresh" airflow down to approx. 8.8 g/s.
(*) Actually EGR closuretime "slides" during the process from 1.5 to 2 seconds (as below). The sound clip was from a beginning.
The flat section on the right starting at 1585 seconds is where engine run returns back to normal.
To prove my theory we certainly should find a van having active fault P0401 - insufficient EGR flow detected.
Does this make any sense at all? If there is any interest for more I'll start a new thread.
What takes priority optimal combustion monitored by the lambda sensor or optimal NO reduction monitored by the NOX sensor?Thank you very much for the interest
My thought about the phenomena is that the engine is doing a kind of EGR calibration. As the EGR cooler gradually gets clogged, EGR needs to be adjusted accordingly to maintain optimal combustion conditions.
Below a zoomed out version of the recording above - but just two parameters (EGR closure vs. air flow)
So basically EGR is kept closed 0% (no exhaust recirculation) for 2 seconds (') thus cylinders are filled with fresh air (approx. at rate 16.9 g/s). Then EGR is quickly opened (to 40%) which reduces the "fresh" airflow down to approx. 8.8 g/s.
(*) Actually EGR closuretime "slides" during the process from 1.5 to 2 seconds (as below). The sound clip was from a beginning.
View attachment 118776
The flat section on the right starting at 1585 seconds is where engine run returns back to normal.
To prove my theory we certainly should find a van having active fault P0401 - insufficient EGR flow detected.
Does this make any sense at all? If there is any interest for more I'll start a new thread.
EGR system only degrades combustion as far as I’m aware.
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