First thing to do is to pull off the tube running from a splitter at
the intake manifold to the driver side fender, and blow it out with
air. That fixes about 90% of the "turbo" problems. I like the price
of the repair. (assuming the routing is the same as on 86-87 OM603s)
If that fails, then check the OVP relay behind the battery. The
turbo wastegate is the least likely failure.
I had a question about the bad wiring. Was it models made in 1991 or
models made in 1990. Bit of a difference there. The car is pretty
cherry. No boost rush either wastegate is stuck or OPV is plugged...
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