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[aaronjb]

No real black smoke, except when chugging on tick over.

What's the black smoke, if not overfuelling?

[377]

No real black smoke, except when chugging on tick over.

What's the black smoke, if not overfuelling?

Fair point, well made 

[377]

More proof that something is slightly amiss, popped into my local garage for a chat and stuck the diesel probe up the exhaust.

Off load "P" or "N" (tick over) the smoke was all over the place 30-90% depending on how it felt

In gear ticking over <2% generally

Revving >1k then about 0.3%

Couple of things spring to mind

I have a manual TD ECU connected (The engine came from a manual car), I wonder if an ECU from an auto has a different map for tickover ?

Wonder if i've missed something out in the wiring between the autobox and the ECU ??

[Omegatoy]

so as  soon as its under load it sorts itself? is that what your saying  :-/

[377]

Bugger, might have answered my own question here... One thing I have left to connect is a relay (K13) to P/N signal and pin 26 on the ECU (anyone know what that does ?) PIn 26 on a manual goes to plug X3 pin 5 and goes to CRC (cruise ??)

Wonder what that lot does then

[377]

so as  soon as its under load it sorts itself? is that what your saying  :-/

appears to yep  :-/

[Omegatoy]

so as  soon as its under load it sorts itself? is that what your saying  :-/

appears to yep  :-/

god thats strange, its old skool diesel apart from the elctronic throttle, so theory says it should be quite happy loaded or not,
what speed does it tickover at? is it stable or all over the place?
what happens if you just very very lightly press the accelerator? any difference does it smooth out slightly or not at all?
oohhh just thought try putting a blanking plate in the egr pipe at the throttle body just for a trial, unless you already have it blanked?

[Kevin Wood]

No real black smoke, except when chugging on tick over.

What's the black smoke, if not overfuelling?

Fair point, well made 

.. but... On a diesel you have all the air you like flowing through it, even at idle, so more fuel correctly injected just makes it run faster to a point. More fuel injected with the wrong timing or dribbling out of the injector instead of spraying, however,...

oohhh just thought try putting a blanking plate in the egr pipe at the throttle body just for a trial, unless you already have it blanked?

Might well be worth a try.

Kevin

[377]

ticks over at 600 ish, seems happiest at 900+, except when in gear and  it ticks over at 600 happily, although takes a second or two to settle (excess fuel i guess)

I'll try blanking the egr valve off, I'm sure I can find something at work to block it off with 

[Marks DTM Calib]

EGR on a diesel should be fully open at idle so I doubt thats it.

[aaronjb]

Bugger, might have answered my own question here... One thing I have left to connect is a relay (K13) to P/N signal and pin 26 on the ECU (anyone know what that does ?) PIn 26 on a manual goes to plug X3 pin 5 and goes to CRC (cruise ??)

Wonder what that lot does then

I'm going to guess it tells the ECU it's in Park or Neutral.. 

Sorry, no real help, but.. I wonder if it tells the ECU to inject (much) less fuel as there's no gearbox load on the engine?

[377]

EGR on a diesel should be fully open at idle so I doubt thats it.

So what happens if it's not ??

Anyone spotted i'm a little out of my depth with diesels 

[377]

Bugger, might have answered my own question here... One thing I have left to connect is a relay (K13) to P/N signal and pin 26 on the ECU (anyone know what that does ?) PIn 26 on a manual goes to plug X3 pin 5 and goes to CRC (cruise ??)

Wonder what that lot does then

I'm going to guess it tells the ECU it's in Park or Neutral.. 

Sorry, no real help, but.. I wonder if it tells the ECU to inject (much) less fuel as there's no gearbox load on the engine?

Not sure, I've searched for the ECU (DDE 2.11) schematic to no avail. Fuel injector pump I can work out is controlled by P68 and that seems to go to pins 1,2,35,39,14, 21 and in a convoluted way to pins 10 and 17 but externally it isn't connected to pin 26.. internally that may be a different matter.

The electronics and wiring I can get my head round if it's available, the internal bits (ECU) are a mystery and that really does not help.

[Marks DTM Calib]

EGR on a diesel should be fully open at idle so I doubt thats it.

So what happens if it's not ??

Anyone spotted i'm a little out of my depth with diesels 

so, it was a diesel out of an auto and now its manual....let me consult my wiring info

[Marks DTM Calib]

EGR on a diesel should be fully open at idle so I doubt thats it.

So what happens if it's not ??

Anyone spotted i'm a little out of my depth with diesels 

Nothing, diesels of this era regulate the fuel, not the air and hence as long as there is some air it will combust fine