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#1
11-07-2004, 04:05 AM
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Fuel pressure measurement Help W124 260E 1988 M103
I have built myself a device to measure the high and low chamber pressures (see the picture).
Measurements at idle: Upper chamber 5.7 bars; Lower chamber 5 bars; difference 0.7bar. The books difference should be between 0.4b and 0.5 bar. Is 0.7 are too big? Moreover when my engine idles badly, the low pressure oscillates of +-0.2bars around 5bars. When engine is idling smoothly no oscillation. Anybody has any idea on what is wrong? Another question; is there any connections available to measure the pressure on the check valves on the pumps?
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Keep us posted especially if your problem is solved Present cars: My car: E-class 420CDI, 2008, W211, V8, 180 000km Wife's one: C-class 220CDI Sport Coupé, Euro, 2002, W203. 345 000km Son's one: GLK class, 220CDI, 2009, W204 Sold: E-class 260E, 1988, W124, Wonderfull car sold after 489 000 kilometres of reliable services (engine M103, clutch, brake system and 5 speed manual gear box all original). Sold: E-class, 320CDI, W210, 2000, 225 000km Last edited by cc260E; 11-07-2004 at 04:11 AM. 
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