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M535i is still stumbling between 4500-5500 RPM (archive)
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Posted by Duke on May 06, 2001 at 06:07:28:

Hello All,
Have replace fuel tank pump, main pump, new fuel filter, spark plugs, valves adjusted. Still have the annoying flat spot at 4500 rmp. Does not run anywhere close to red line strong above 4500 rpm. Any suggestions? How do I check if the fuel regulator is good, it looks new?
Thanks,
Duke
85 M535i



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