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Old 08-17-2007, 07:02 PM
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Join Date: Aug 2007
Location: Sealy, Texas
Posts: 58
Question Plug fouling 260E

Evening guys.
Problem vehicle is a 1987 260E. 98,000 miles believed genuine (yeah right!)
I can put new clean spark plugs in the motor and within 3 mins of idling they are covered in black soot and the motor missfires eventually stalling.
Running rich is my guess.
I've read every thread here (and there's a couple off hundred) with regards to possible reasons. My question is before I start throwing parts at it... what's your best guess'

I will take the most popular guess and run with it

Michael

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Old 08-17-2007, 10:44 PM
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Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
Don't guess, take it to a shop with the correct pressure gauges and check out the fuel distributor pressures.

A failed pressure regulator can do this (if there is gasoline in the hard plastic line going to the rubber breather hose, it's toast), so can a plugged return line, bad fuel pump (inadequate pressure), a bad EHA, or a punctured internal diaphram on the fuel distributor, and even a bad 02 sensor.

Some of this is fairly cheap to replace, some if it very expensive, so it's worth the hour's work to find out.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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