Hi Guys
Im having that old surge problem . If the egr valve is unpluged could this cause the problem ? Ive already disconnected the flappers
and tied them opened still surges. I noticed when it surges if I stop the
engine wait 10 sec than start it up no problem for a while.
No codes are coming up. Whats my next move? Thanks Greg

The flaps are not part of the EGR system. They are there to "tune" the intake for improved efficiency of the engine. I don't know whether tying them open will cause "surging" (whatever that is) but the flaps should not be disabled. Blocking the EGR valve properly will not cause problems.

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

Thanks for the reply
Will unpluging the wires from the egr valve cause surging?
Thanks Greg

It will set a code but I don't know about surging.

__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

Thanks for the reply
Could the ecu cause this surging prrblem? Thanks Greg

Possibly but it's more likely that the ECU is getting "wrong information" from a sensor and that is causing it to cause the surge.

Please describe exactly what the engine does when it "surges." What does it sound/feel like? Is this at idle or while driving? Speed related?

__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

Thanks Jeremy

It starts fine I drive for about 15 to 20 min than it loses power like If you would take your foot off the gas pedal than it comes back again it does
this a few times and always when accelerating at about 1500 to 2500 rpms than I turn the engine off for 10 sec it starts than run fine for 20
or 30 min. Ive cleaned the tank replaced the primer pump replaced the
injectors replaced the o rings still surge. Im looking at the ecu.
No codes their disconnected I got it back east couldnt get my money
back also the flapper are all tied open right now . Thanks Greg

Hey your problem is with your Intake manifold flaps sticking... you can remove them clean them out. Make sure they opperate freely. it will clear up the problem. I'll post the a link to my earlier posts with pic's on how to remove and clean them out...

Found it... http://www.peachparts.com/shopforum/showthread.php?t=213028

Thanks for the reply
All the flappers are tied open they dont move for right now can
that cause the problem ? Greg

Sorry I didn't read the 1st part of your post.... but unplugging the EGR valve should put the system into failsafe mode which does not open the flappers and give you poor top end.

Well not to sure then.. you could still have issues, if the ECU is attemting to make corrections and it gets into a state of oscillation.

There is also an air flow sensor in the intake tube leading from the Air Cleaner but it shouldn"t cause the surging you discribe. Which Flappers did you tie in the open position, the engine should have poor top end or low end dependent on which way the valves are tied open/closed.

Question, why would you tie them open? Were you able to reach both the Flapper valves under the intake manifold. If I remeber correctly there is one in Crossover pipe and the other you can reach from under the car. Its in the main intake manifold section which bolts to the head. If they are binding and not opening and closing freely then I would assume that is you issue.

Is there any smell or signs of diesel fuel?

Other things to check:
K40 Relay
leaking around the disrtibutor valves
tearing or pinching around the fuel filter O ring.

Thanks for the reply

Is there anyway i can call you or you call me it sure would help?
I need to explain my typing skills are slow. Thanks Greg
enerod4me@aol.com

I'm having the exact same problem on my '97. If you find what fixes it, PLEASE be sure and post back here what it is!!

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'98 E300 turbodiesel

Hi Guys
Im about to spend 1000.00 on a ecm to stop this surging Ive been
told that the solder joints break with the vibrations of a diesel like the k40 sensor did . I hope this is the problem. Greg

Why don't you borrow a known-good one first to make sure that's the problem? 1000 is a lot of clams to drop on a guessing-game, and being an electronic component, it's probably non-returnable...

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'98 E300 turbodiesel