Hi everyone,

I have a 1991 190e 2.6, auto, with 124k on the clock. Only known issue is a bad valve guide seal, no appreciable oil consumption, just carbon build up on one plug that I clean during oil changes. Plugs and fuel filter has been changed a couple thousand miles ago.

Here's the issue: Within the span of a few days and about 20-30 miles, the car went from running beautifully, to being not drive-able. It started as a hesitation under acceleration one day to hard starting, running really rough and stalling when put in gear or when the accelerator pedal is briskly pushed in by the end of the next day. Seems to idle high too. After the initial hesitation/trying to stall/nursing the revs up, it seems to build RPM as quickly as it should.

I drained what was in the tank and put in fresh gas. I don't see any obvious vacuum leaks, but I'm far from an expert. Fuses are good. If I unplug the ICV, the rev dip into the 500-600's and it barely runs. I don't know what that means, but I assume it's working? Cleaned it for good measure. No lights of any sort, so I don't suspect the OVP, also, OVP fuse is good.

What else should I trouble shoot? Heavy hesitation/stalling under acceleration suggests fuel issue to me, the Bosh fuel injection system is more complex than anything I've dealt with previously.

I've done a significant amount of searching, but honestly, there isn't much resolution is most threads.

Thanks again for making it through the long read.

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1997 E300 Diesel - 222K miles