Engine runs strong til 4500 RPM, then power fades abruptly.
Running thru the gears (5 Speed Man. Trans), engine runs superbly, then at 4500 it hits a wall. What has been replaced in the last year; new fuel pump, fuel pres regulator, oxygen sensor, & catalytic convertors. Rebuilt engine has 20,000 miles on it, in a 92 525i with 95,000 miles.
Has anyone experienced a similar problem or have an idea what might be causing it?
Thanks in advance!