99 E240 60K:
Recently the cars performance has decreased drastically. It goes better at
part throttle than at full throttle! I tested it today. If i floor it and it
kicks down into second the engine stops to pull and refuses to go past 5.5K
and it doesnt upshift. This was on perfectly flat road with only me inside.
I also tried it in 3rd and same thing happens. Above 5k it hits a wall and
refuses to go faster than 5.4-5.5K, and i doesn't upshift until you let go
of the gas. The engine doesn't seem to struggle, but it just does'nt want to
go faster. At about halv throttle it's seems there a "sweet spot" and if i
keep the pedal there it will pull smoothly to 6.3K before upshifthing. But
when it upshifts it "takes a break" for 0.5 seconds before the next gear
goes in with a bang and push in the back. Clearly something is not right.
I'm thinking some electronic stuff that manages engine/transmission, or a
transmission that is about to blow?
Sounds like a vacuum leak, particularly concerning the upshifting when you
"let go of the gas" which is when the manifold vacuum is probably at its
highest. I know next to nothing about this car, but I would look for a
vacuum line somewhere that has become brittle or otherwise unservicable.
I second the notion of changing the fuel filter. A loss of power at speed is
the first symptom. Depending on the capacity of the filter, the engine will
eventually refuse to run at all.
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