E300 voltage? - Page 2 - PeachParts Mercedes-Benz Forum

silver · #16 09-01-2013, 08:46 PM

IT SOUNDS LIKE THE SAME SHAKE AND SURGING THAT I HAD IT,
WE FOUND THAT THE CONNECTOR FOR EGR VALVE, HAD A BROKEN,
WIRE THE BROWN WIRE. AFTER IT WAS REPAIRED THE CAR RAN GREAT
CHECK ALL GROUNDS CONNECTORS

THE CARS AND NEWER TRUCKS ARE DRIVE BY WIRE.

SILVER

Jeremy5848 · #17 09-01-2013, 09:05 PM

That be it. The "K40" terminology probably came from the schematics, I haven't looked in awhile. Sounds like you have done your homework. I agree it's a puzzling problem. At least they're "only" ~$100, some of the others are tens times as much!

Jeremy

VW1300 · #18 09-01-2013, 11:26 PM

Silver: Stupid question - the ground wire should always show continuity with the rest of the negative components/ground system of the car, even with the car switched off? The EGR flap works - can see it open and close when idling, but without going out to the garage at this late hour I do believe the EGR itself has another connector. I'll check the grounds, thanks!

Jeremy: I know what you mean about "only" $100 but that's an hour's labor at a good mechanic, who may also question the integrity of the K40. The relay may take a day to get here - my experience in my first year of ownership of this car is that even the dealer has to call up to Dallas for certain things in this uncommon engine - so worst case scenario, eliminating that possibility does have value should I have to take it back in. Best case scenario, it solves the problem.

I'm trying not to think about this too hard over the long holiday weekend, and how a coworker who has owned 2 Dodge Cummins diesels told me he's had this happen when the IP goes bad, so once I get a chance to check grounds and then order the K40 etc I'll report back any findings.

Thanks, and enjoy the day off if you can!

Jeremy5848 · #19 09-01-2013, 11:55 PM

Speaking of EGR, Charlie, has it been blocked (for testing purposes only)?

VW1300 · #20 09-02-2013, 09:38 AM

Not to my knowledge anyway. On a '97, doesn't the EGR know if it's been blocked? There are ways to get around that, but my setup looks stock to me. On the other hand, does the EGR itself get clogged? I'm thinking about Silver's comment where his EGR was apparently not opening and closing properly, although I would have thought that situation would throw the EGR code.

Jeremy5848 · #21 09-02-2013, 10:50 AM

In my USA-spec 1996 E300 (W210) the electronics knows if EGR does not open and sets a code. However it doesn't know if anything is actually passing through the EGR valve so it can be left in place but blocked.

The 1998 turbodiesel, OTOH, can tell if the valve is blocked by sensing the pressure differential. It is much too smart.

Your 1997 model is in the middle; I don't know what it has in the way of smarts. At the very least you should pull the crossover pipe and clean out the crud, making sure that the various flaps and valves are all working. If you can successfully block EGR, so much the better. Do it reversibly if the car has to pass inspection. Once you have EGR blocked you can clean out the crossover and the intake manifold. The pressure control flap ahead of the EGR valve can also be removed.

Jeremy

VW1300 · #22 09-02-2013, 11:19 AM

I pulled the crossover pipe last year and it looked good, so I know how to do that - is it safe to start the car with the pipe off to see if the flaps are all opening/closing on cue? I can't really see under there when everything is together.

Jeremy5848 · #23 09-02-2013, 11:52 AM

Quote:

Originally Posted by VW1300

I pulled the crossover pipe last year and it looked good, so I know how to do that - is it safe to start the car with the pipe off to see if the flaps are all opening/closing on cue? I can't really see under there when everything is together.

Just make sure anything that can get sucked into the intake manifold -- rags, tools, small children -- are safely out of the way.

I am considering adding microswitches to each flap so I can see (from the driver's seat) that the flaps are opening.

In any case, a flap problem should not cause the stumbling problem you have been experiencing. All the flaps do is to "tune" the pipes so the air intake is more efficient at all engine speeds. Non-functioning flaps will make the engine peakier but shouldn't cause stumbling.

Jeremy