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Old 09-24-1999, 04:39 PM
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I have a 250SE that is running rich. The wires that are suPPOsed tO be cOnnected tO the fueL injectiOn PumP are missing. DOes this have anything tO dO with it running rich? If it dOes, I need tO knOw where tO run these wires frOm. There seems tO be sOme wires cut near the master cyL area and frOm under the dash. Any infO wOuLd be a great heLP

Old 09-24-1999, 09:34 PM
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Location: Suwanee, GA, USA
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I d0nt kn0w ab0ut this, but c0uldn't resist writIng in ThIs sCriPt.
Old 09-28-1999, 09:56 AM
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Sorry about the way it was typed, but my co-worker spilled coffee in my keyboard!
Old 09-28-1999, 10:14 PM
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Join Date: Aug 1999
Location: Florida / N.H.
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Your 250SE has mechaical fuel injection and
the mixture is controled at start up with a time start valve, starting atomizer, [ on the intake] and rich solonoid. The wires feeding this circuit should be connected for proper operation, however I would look first to see if the start atomizer is leaking by. This is common.
This pump also has it's own oil res. and
dip stick on the lower rear end of the pump.
Very hard to see from on top and very few know it is there as the 280's of the following year incorporated oiling passages from the crank-case. Check the dip stick for proper marked level as low or high will
affect the pump metering.
I recommend re-wiring the system. I have the schematics for this series pump and will send them free of charge if you e-mail me an address.
113 Tech
Old 09-29-1999, 12:01 AM
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No. The missing connections can't cause a rich condition. The solenoid is for starting. Later cars had two solenoids, the second is for deceleration shutoff under "thrust" conditions...downshifts. If it is running rich, look at the cold start valve. If that's not the problem, time for a rebuild of the injection pump(contact me privately).
Randy D.

ASE Master Tech
Mercedes Tech 19 Years

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