My trusty 280CE with, i beleive, a M110.888 engine has trouble idling, when the engine is warm. That is, when oil pressure drops below 1,0 (psi?). Idle is very rough, the warmer it gets (engine+weather), and sometimes it will stall.

I'm suspecting the warm-up regulator or a leaky cold-start valve, because :
-valves have been adjusted (helped general idling)
-compression on all cylinders in the range of 125-145psi
-new plugs+wires installed (no improvement)
-no appearant leaks on the intake side. I sprayed intake side with starter-gas : manifold, o-rings, rubber tubes etc.
-Idle is probably also bad when the engine is cold, but not at notceable, because of the warm-up regulator keeping up rpms.
-oil pressure is 3.0 (psi?) with cold engine and also rises to 3.0 as soon as i touch the gas pedal.
-I have given the idle +100 rpms so it doesn't stall, but idle is, of course, still bad.

I found plenty of guides for troubleshooting the k-jet, but all "warm idle" remedies mentions "warm control pressure", and i cannot relate that to any Danish terms. My German K-jet manual does not refer to any terms, that could be the "warm control pressure" either.

Can anybody help explain, please ?

Jesper,
Copenhagen, DK

__________________
Jesper Bach
280CE '84
w123.homepage.dk

There are two lines to the warm-up regulator. The one that comes off the very top of the fuel distributor is the control pressure line (the other line goes back to the tank).

"Warm control pressure" is the fuel pressure in this line with the engine warm.