Why does my engine surge (actually, lag) when it rains or just after I clean the engine? I've already replaced a bunch of vac. hoses to no avail. What am i missing? This cant be electrical can it?
Thanks,

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Paul
2004 E500 4matic; 72,000mi

It could only be electrical if you have a short that is unfused and drawing considerable current (feels like the AC is on) dragging down the alternator.

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!

Peter,
That is what it feels like. But could the alternator drag on the engine THAT much? I mean, this is with a good head of steam in the turbo, too.

I do know of a ground that is broken. Never seemed to be a prob. before though. I'll post a picture today.
Paul

__________________
Paul
2004 E500 4matic; 72,000mi

Paul:

The alternator will put out 80 A or so, and if you have a short when wet in an unfused circuit (like the wire from the alternator to the battery), it will take a large amount of horsepower to generate that much juice.

More likely is an accessory dragging when wet, like the ac compressor.

And don't forget brakes.....!

Peter

__________________
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!

I dont have an A/C compressor. Good thing summer is passed! Will check for a short soon.

__________________
Paul
2004 E500 4matic; 72,000mi