535 hesitation

["w. b. gerard" <agelastus@xxxxxxxxxxx>]

Ray-- I'm not sure if there's a parallel in the e28's anatomy, but a
similar problem was solved in my e34 after we discovered a bolt securing
the AC compressor had come lose and the compressor had pushed in the
crank sensor.  The sensor was sending erratical signals to the ECU and
the car had major idling problems, but all is fine with a replaced 
sensor (and tightened bolt).  Good luck.

Blake
89 535


hi all,
i am at my wits end with this hesitating/stumbling/backfire (popping) at 
low RPM (1200+) or on initial acceleration.
Always seems to run well  when i startup in the morning, but after 
running for a while (and especially with extended idiling) this 
phenomenon of hesitating..choke..backfire pop..push tha accelerator all 
the way down and still nothing..just jerky lurches with a lot of 
popping!!...and then off we go!! but come to a stop and idle and it 
happens all over again.
I have changed ICV,fuel filter, fuel pressure gauge and because it 
seemed to be a temp related problem, i changed the coolant temp sensor. 
No dice.
My idle is always steady at about 650..rough but steady..changed all the 
vac hoses..plugs etc..but thats another problem..
just wish I can get to the bottom of the hesitating..
Thanks all
ray
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