Hopefully another BMW lover out there has had a similar problem and
can help me. Recently my prized possession has been "stuttering" once
i get to about 4 rpms. The engine seems to miss a beat but then comes
back but then misses again. Stuttering is the best word I can think of
to describe it. I'm guessing it has something to do with the ignition,
which is why i've checked the cap and rotor, plugs, and almost every
sensor on the car. Any suggestions??
Fuel filter, fuel pump relay, fuel pump. This year was a crossover from 2
pumps (1 external, 1 in tank) to 1 internal pump. Checking/changing these
shouldn't take more than 2 hours tops. I'd also remove the fuel injectors
and have them professionally cleaned and tested. Mine were done for $120 and
made a WORLD of difference. If you can get the newer 3-pintle Bosch/Ford
injectors cheap, do it. Just make sure the resistance is the same (Ohms). I
have more info on injectors if you want it.
Bill in Omaha
Thanks for the input. I've actually checked the fuel pump relay and in
tank fuel pump. I replaced the fuel filter and fuel pump due to
buzzing, but the pump I got off my parts car buzzed just as much. I've
had a few other opinions on it and they all seemed to jump right to
ignition. After checking almost the entire electrical system (minus
the ECU), a problem with the injectors makes sense. We actually just
rebuilt the head after a blown head gasket and I cleaned the injectors
as well as I could. It had been running great for a couple months and
just recently started stuttering. I'll definitely check the resistance
on the injectors. Thanks!
There is a HUGE conversation -- hundreds of posts, i think -- on this
topic on the bimmerforums site. It seems, unfortunately, that there
is no single answer to what causes the all too common hesitation, and
that trial and error of going through all sorts of attempted fixes can
be quite expensive and time-consuming and frustrating. but have a
look there for a list of dozens of things that others have tried/
tested/occasionally found to work. personally, i passed on a couple
of e30's for sale because of this, and waited to buy (my new--to-me 85
325e) till i found one with issues, no doubt, but not that. good luck
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