After a few minutes of driving (5 - 10 minutes), the turbo on my 1992 300D 2.5 Turbo switches off, and the darling goes into dog mode. There is error code 5 when checking the EDS system. The 5 means vacuum transducer, or EGR system.

I went through the checks in the FSM (well worth the money BTW) and I got stumped. I was checking that vacuum gets through the vac transducer (the Star Trek looking black plastic thing near the coolant reserve tank (pic attached). Vacuum gets to it-20"Hg, but never gets through it. I took it off and checked it doesn't leak. It's like the vacuum is dissapearing. There is vacuum in the line if I exclude the Vac Transducer, and it doesn't leak. But if I put vacuum to it, none comes out any of the lines exiting it.

Doesn't make sense to me. I'd be happy to repalce it with the $148 replacement if it is what the problem is. But I'm not convinced it is the problem. Becuase it is mechanical, I'm thinking it will either work or not work - not work for 10 minutes and then quit. If I restart the car after the turbo has quit, it will work again for 10 minutes. So to me that sounds electronic, but I don't know what to do about it.

Any suggestions? Please..... it's driving me crazy.. been looking at the problem for months and I'm starting to think I must be stupid !

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1983 240D Silver/Blue "Sadie", unknown miles. 100k miles on WVO single tank, converted to 2 tank about 10k miles ago, FPHE, Injector Heaters, Aux Fuel pump. Alcohol/Water injection. Frantz oil bypass filter
1992 300D 2.5 Turbo Green/Tan "Jade" 267K miles Stock.
1992 300D 2.5 tan/tan "Rocky" on 2 tank WVO. Pressure actuated Turbo "rat's nest" surgery completed. 197k miles

Maybe it takes the system 10 minutes to detect that the part in question is malfunctioning.

Sorry not much to add, but at least you're getting a bump

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-justin

1987 300TD, 1987 300TD
2008 R32, 2000 Passat Wagon

I am unfamiliar with your particular system.....but from the photo there appears to be a switchover valve (MBspeak for solenoid valve)....is vacuum passing thru there......

And there appear to be some electrical connections attached to the Flyin' Saucer......is there supposed to be a signal to actuate it?? if so, is the signal getting to it??

If all else fails....try tapping on it, gently! I think that there may be a shuttle valve inside......

SB

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Diesels:
'85 300D, "Max, Blue Benz", 155K, 27.0 MPG
'84 190D 2.2, "Eva, Brown Benz", 142K, 40.2 MPG
'77 240D (parts car)
'67 Eicher ES 202 Tractor "Otto" (2cyl, Air Cooled, 30HP)
Gassers:
'94 Ford F-150, "Henry", 170K (300 Six) 17.5 MPG
'85 190E 2.3, 148K....Parts Car
'58 Dodge W300M Powerwagon (Flat Fenders) Less than 10 MPG