Turbo help needed (1990 300D)
Turbo help needed (1990 300D)
1990 300D 2.5 Turbo 5-speed...stock for the moment
Motor runs great and so does the turbo...when it wants to. The boost is intermittent. I will accelerate up to speed, turbo responds quickly, 15-17 lbs boost. I will start to cruise, boost will drop and won't come back up. Maybe the next couple of times I will accelerate I will have only 1-2 lbs or 0. Sometimes i will be in the middle of accelerating and the boost will jump up or drop off. It's like a switch just turns off. Does anyone know where I should start looking? Can I go with a manual controller and ditch these solenoids? Thanks.
1990 300D 2.5 Turbo 5-speed...stock for the moment
1987 300SDL 6spd manual om606.962 swap project
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willbhere4u
11-23-2010, 08:14 PM #2First check the turbo shaft for play!
1987 300SDL 6spd manual om606.962 swap project
1985 300td euro 5spd wagon running
1998 MB E300 - 194,000 miles. Current/future mods: 7.5mm pump elements, Holset HX40 Turbo feeding Eaton M90 supercharger through custom fabbed intake system. Aeroturbine muffler, scratch-built 4" stainless exhaust. EGR eliminated, ECM recalibrated, modified rack position feedback circuit. Porterfield RS brake pads, Bilstein sport shocks, VDO EGT, oil and boost gauges.
2000 Ford F250 - 150,000 miles. Current/future mods: DP Tuner 3 map chip, scratch-built high flow intake, high output IDM, open circuit fuel system, ball bearing turbo, South Bend full metal clutch, slotted and drilled rotors. Autometer Sport Comp EGT and boost gauges.
Yeah, isn't there some sort of boost "switchover" valve in these cars that controls the wastegate?
1998 MB E300 - 194,000 miles. Current/future mods: 7.5mm pump elements, Holset HX40 Turbo feeding Eaton M90 supercharger through custom fabbed intake system. Aeroturbine muffler, scratch-built 4" stainless exhaust. EGR eliminated, ECM recalibrated, modified rack position feedback circuit. Porterfield RS brake pads, Bilstein sport shocks, VDO EGT, oil and boost gauges.
2000 Ford F250 - 150,000 miles. Current/future mods: DP Tuner 3 map chip, scratch-built high flow intake, high output IDM, open circuit fuel system, ball bearing turbo, South Bend full metal clutch, slotted and drilled rotors. Autometer Sport Comp EGT and boost gauges.
Where is the overload protection valve? I see the three valves by the airbox but they only have vacuum reference.
1990 300D 2.5 Turbo 5-speed...stock for the moment
I clearly think I have narrowed it down to a vacuum or switch issue. I don't think there is a problem with the turbo, wastegate or actuator.
Where is the overload protection valve? I see the three valves by the airbox but they only have vacuum reference.
1990 300D 2.5 Turbo 5-speed...stock for the moment
The valve should be on the driver side somewhere in the engine compartment.
Electrically the valve is connected to a pressure switch which might be in the intake manifold. Over pressure there makes the valve swich on and vent the ALDA (disconnect boost to ALDA).
Tom
follow the line connected to the ALDA.
The valve should be on the driver side somewhere in the engine compartment.
Electrically the valve is connected to a pressure switch which might be in the intake manifold. Over pressure there makes the valve swich on and vent the ALDA (disconnect boost to ALDA).
Tom
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