1987 528e with sudden idle/electrical issues

atlbrent

New Member
Messages
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Location
Atlanta
#1
Hey all,

Today, this afternoon, out of the blue I had a problem after starting my 1987 528e with 212,000 miles. It started fine but then I noticed all of the dash gauges were off (not working) and the car begin to climb to a screaming idle...so I turned it off. During the time it was on, all windows, radio and other electrical items worked...just all dash was off. I tried to start it again but did the same thing...hitting the accellerator only made it seem worse and idle igher and higher to where it was full rev!

The 3rd try, it started but then began going up and down as if I was pulsating the accelerator...but I was not. Finally, i did the old trick that a former friend did once. Uhooked the neg. battery terminal for 2 minutes and put it back on. Car ran fine for the 3 miles home. Once home, shut it off, then tried to start it again. Once again...same high revving idle thing to where I thought it would blow a seal, and no dash instruments were on again either. Instead of turning it off, i lifted the hood to check the throttle cable and anything else. Then I firmly but gently hit the fuse box...it began idling fine!!! All instruments came back on! once I hit the fuse box again, problem started all over again midstream.

This is what has been done recently:
Fuel pump relay replaced.
All fuses replaced (just replaced heater/blower fuse tonight)
that's it.

Any ideas of where this could be short of completely rewiring the fuse box?

Thanks a ton and everyone on here has been great so far.

~Brent
 
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Wayzata, MN
#2
hey, welcome to the site. that sounds pretty nasty. it could be a stuck throttle cable. i'm not to up on the tech involved with '87 5-ers, but if i were to guess i'd say definately an ecu issue. this is boggling my mind, because hitting a fuse box shouldn't do anything unless like you said, the entire box needs to be rewired. and i suppose you've already pulled most the fuses to check that they are the correct ohms. let me check around, hopefully someone else will chime in too. good luck
 
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Location
Here and there
#3
I would suspect the idler motor? may be stuck? Try hitting it "gently" with the handle of a screw driver and see if the idle will go down or if it makes any diference
Let us know what you find
Tony P.
 


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