Quote:
Originally Posted by gmercoleza
First of all, acceleration doesn't seem linear when flooring the gas. I don't know what other way to describe it. When accelerating lightly or moderately, everything seems fine. But when flooring the gas, such as when passing or entering an on-ramp, it seems like the rise in engine RPMs just isn't very smooth, almost like it's choking very slightly. And I can never get it quite to redline like with my M103; this one just seems to struggle to get way up there. Air and fuel filters are recent, so I don't suspect them...
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Sorry, I would have to disagree with the post on non-linear acceleration being the norm on an M104. If you are getting a slight "choke" or "miss" under hard acceleration, there is a problem somewhere.
Trouble is, there are so many systems to diagnose, and a combination of issues can also contribute. Old vacuum hoses, a cracked intake, wiring harness, plug wires, fuel distributor...the list goes on. It's too expensive to parts swap at this juncture either.
My W124 suffered from some of what you experienced, and it took a top-end rebuild (it was head gasket time anyway) to cure it. I experience none of that anymore when I tromp on the gas pedal!