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#1
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w124 turbo switches off after a few minutes
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 |
#2
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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 |
#3
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Later W123's have a Blue Star Trek lookin thingy....
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 |
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