m-TDI loads up when cold?????

[westyventures]

Karl,
Thanks for joining in!!  I've not added a oil pressure gauge so I can't say how it is.  I've been waiting til I can afford to add a pair of dual sweep gauges to cover the vitals.  I cleaned the pump really good when I installed it, however, it was the pump that came with the pan and etc. from England. 

Would this allow oil into the cylinders?  re. 'bluish' smoke

When you saw this did it get resolved?  If so, how?

Michael

Probably not oil smoke you're seeing, but uncombusted fuel. It might be worth just buying a cheap (but accurate) oil pressure gauge now to check this. The fix, for when it first happened to mine, was a new pump. I removed the old pump and found shrapnel embedded in the pressure relief valve, causing it to remain closed.

[MichaelBuck]

Snap, I was looking for that gauge as you posted. 

Possible to clean the relief valve?  Or is that the end of it?

Where would you buy the new pump?  Hadn't looked for them in a while but remember they were pricey. 

MICHAEL   

[westyventures]

Snap, I was looking for that gauge as you posted. 

Possible to clean the relief valve?  Or is that the end of it?

Where would you buy the new pump?  Hadn't looked for them in a while but remember they were pricey. 

MICHAEL   

Not worth cleaning the valve, imo. Bus Depot has the new pumps:
http://www.busdepot.com/view.jsp?model=59&category=15&group=13&prodgroup=143

[Rabbit on Roids]

If I understand your description correctly  we see this same behavior on IDI engines sometimes as well... on my old Rabbit truck it expressed itself as running ruff, lots of white smoke, power issues, until you gave it 30 seconds to smarten up.  When it happened I found I could "hurry up" how quickly it smartened up by popping the clutch and stepping on the throttle... engine would cough, spit, complain, and then even out and rev up.  Foot off the accelerator and all was right with the world until the next time the engine was stone cold.

My theory at the time was one or more injectors that spray poorly at cold temperatures, yet fine at room temperature on the workbench.  30 seconds seems about the right amount of time for something to warm up and make the problem go away... and the only fuel-related something I could see warming up in 30 seconds is the injectors themselves.

My current IDI doesn't do this... but the next time I find one I'm gonna pop-test the injectors after they've been in the freezer overnight... and then again at room temperature.

ive got some of those injectors for ya vince. my rabbit does not like starting cold. but after pedaling it for 20-30 seconds it will sit there and idle all day.

[MichaelBuck]

What's the cold oil pressure? I've seen the oil pump relief valve stick and cause too much oil pressure to pump the cam followers up to a point where the valves start to hang open, = loss of some compression and gobs of smoke, will eventually sort itself out and disappear when warm.

Karl you nailed the cause!!  I've had the new pump for a while but just put in and haven't seen the symptom since.  Colder weather will be the tell.  Thanks again!

Michael