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

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Jesper Bach
280CE '84
w123.homepage.dk