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My 528i runs with a fair amount of hesitation at part throttle. It smells rich, so I am fairly confident it is not a case of lean surge. I am thinking about getting the injectors cleaned and flow tested before doing any other fuel injection work. I may go megasquirt, which I have done on my 1991 VW, in which case I need balanced injectors anyways. I am very happy with my VW megasquirt, going on 6 years with the install. Anyways, what has been your experience with injector flow testing and cleaning? Did you resolve any issues by doing so? Please don't fill this post with your opinions on megasquirt, or why I should do XYZ instead. I am really after the injector flow testing opinions. Thanks! Mike

I reckon your diagnosis is on the money - pull them out & get them cleaned/tested. (more affordable than new injectors)

The previous owner of my old 520i mentioned this solved a similar problem he had with the car during it's life.

Thanks for the input! I am happy to hear one data point on this. I would like to hear others if anyone else has experience with this. I haven't decided yet to send the injectors our or not. Thanks! Mike

Don't forget you can Google search previous posts (archived) on any subject. Believe it or not, if the poster used searchable words, " Injector cleaning," most new questions have been answered many times over the years.

Problem is, folks often got cryptic or creative with wording questions. " Hi y'all, why are my..."

I remember posts about injector cleaning, matching services. Local Corvette vintage racer friends use them to conclude they must still exist. The matching service predicated on having more than six to pick from.

A close friend, therefore honest, shop owner told me of his injector cleaner contraption. Unit to connect in place of the fuel line that really did clean injectors. Not the same thing as the bottled additives to the gas tank at all.

He also told me if the engine was tuned up, maintained: oil, plugs, filters, timing, valves set, not burning oil,...running smooth, all the injectors were most probably working fine. A bad one will cause a noticeable rumpus and that plug will show it.