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#1
07-02-2008, 10:24 AM
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OM602 Turbo "Cutting Out" under load / rpm's.
I just got my latest "Frankenbenz" on the road. It's a '93 190E body shell with an '87 190D 2.5 Turbo engine mated to a 5-speed tranny. Overall the car runs well. However, under hard accelleration, the engine tends to "cut out" as if it's hitting a rev limiter at about 3500-4000 rpm. I know that there isn't much need to run at these rpm's, but I was trying an Italian Tune-Up when I noticed this phenomena.
It will accellerate hard until 3500 rpm or so, then hesitate, then wind up again, then hesitate again, etc. I'm looking for guidance on how to troubleshoot this problem. Do you folks think it's more likely to be an internal IP issue, or perhaps a boost controller issue? Any help would be appreciated. SteveM.
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'93 190E/D 2.5 Turbodiesel 5-speed (daily driver) '87 190D 2.5 Turbo rustbucket - parts car '84 Dodge Rampage diesel - Land Speed Record Holder '13 Ram 2500 Diesel '05 Toyota 4Runner 
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#3
07-02-2008, 11:14 AM
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Sounds like it's running out of fuel. Make sure the lift pump is operating at rated capacity, filters and tank screen all clean, etc.
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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
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#4
07-02-2008, 11:14 AM
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The first thing I would check is the fuel delivery pressure - see if the pressure drops off when the car bogs down. IIRC it should stay in the 10-15 PSI range.
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98 Dodge-Cummins pickup (123k) 13 GLK250 (135k) 06 E320CDI (323K) 16 C300 (62K) 82 300GD Gelaendewagen (54K)
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#5
07-02-2008, 11:42 AM
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faulty OBP valve? ALDA? combination of both?
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#6
07-02-2008, 11:44 AM
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Or the OBP valve is working as it should and he has way too much boost.
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For Sale: 1982 MB 300TD 1995 Chevrolet Suburban 6.5TD Sold: 1980 IH Scout Traveler- Nissan SD33T Diesel
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#7
07-02-2008, 12:27 PM
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Good ideas guys.
Good ideas guys. I think I'll start with new fuel filters just for good measure. Since I "pieced" this car together, I have no idea when the filters were changed last.
If that doesn't help, I'll move on to checking the actual boost levels and the operation of the overboost protection relay and wastegate. SteveM.
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'93 190E/D 2.5 Turbodiesel 5-speed (daily driver) '87 190D 2.5 Turbo rustbucket - parts car '84 Dodge Rampage diesel - Land Speed Record Holder '13 Ram 2500 Diesel '05 Toyota 4Runner
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