Hi, I am having problems with 1991 190 2.3ltr Merc. Wont start. Fires
up with squirt os start fluid so will presume ignition is OK. Fuel
flow checks out OK. Pressure at delivery to distributor valve goes off
scale on guage (140 psi)
when key is turned on then drops back to 40psi and stays there. When
cranking engine the pressure goes off scale again (140psi) Fuel at
cold start injector but nothing from the distributor valve to the
injectors.Have checked the 2 overload fuses OK. Can anybody help
Thanks for your replys guys. Will check your help on monday. I think I
am taking my reading from the fuel line before it gets to the pressure
regulator. I have since read that pressure is taken from a capped port
on the distributor body, not directly from the supply inlet. Will try
this and see if regulator is faulty. Thanks again. Will let you know
the outcome !!
Today I checked out the pressure regulator and it is fine, running at
75psi when cranking. Left guage connected to the test port in the
distributor head,put some gas down the inlet and it fired up and kept
running but only above 2500 rpm.. Bled the injectors while it was
running at these revs and it ran quite smoothly. Pressure guage still
showing round 75psi. Below 2500rpm the engine will die but fuel
pressure remains the same. When cranking again, no fuel is coming from
the distributor hesd but pressure is good. The distributor valve only
seems to work above 2500rpm. Removed dist head and checked that it
wasn't sticking and it moves freely. Any ideas. Would appreciate any
Reach under the intake manifold from the front. Feel for the U hose that
connects from the middle of
the manifold and goes back to the bottom of the idle stabilizer. When one end of
it pops off......
you get the same symtoms you have.
Thanks Karl, you were dead right. An old guy who dismantles Mercedes
told me to go there and that was what had happened. Apparently if you
get a kickback into the inlet manifold it often pops this pipe off.
Has no clamps on it and stops damage to the air valve plate. The so
called merc experts were no help at all. I appreciate everyones help !
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