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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E30 (1982 - 1993)

E30 (1982 - 1993)
God's Chariot. The E30 was produced primarily from 1982 through 1991. The cabriolet was the one exception which was produced through 1993.

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  #1  
Old 04-15-2016, 03:34 PM
EddieBut EddieBut is offline
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Instrument cluster batteries

I just ordered some new instrument cluster batteries and after watching some youtube videos I'm going to replace the old batteries. I have some funky gauges. Oil temp, gas gauge and mpg gauge are acting funny. I saw some previous threads that diagnosed that this was probably the issue. That and maybe a loose ground on the back of the instrument cluster. Are there any hazards I should be aware of?
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  #2  
Old 04-17-2016, 10:39 AM
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hornhospital hornhospital is offline
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It's a good idea to replace the batteries, but while you're in there clean all the connections and especially the grounds. It's just as likely the grounds as the batteries.
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  #3  
Old 04-18-2016, 05:01 PM
EddieBut EddieBut is offline
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Will do and thanks again for all your help.
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  #4  
Old 04-22-2016, 03:50 AM
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I had similar when I replaced the stock CR1425 3v (which measured less than 1 v) with 3.6v Lithium units ER 14250.
It stuffed my mpg gauge around
At part throttle it shows 0 consumption and at high RPM it shows huge consumption.
Nothing in-between ?
If I disconnect the jumper bridge, so the batteries are not connected it worked.
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  #5  
Old 05-03-2016, 06:29 PM
EddieBut EddieBut is offline
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Successfully installed the batteries and mpg gauge, engine temp gauge are working properly (not jumping all over). The gas gauge is still goofy, works intermittently.
I'm thinking tank sending unit(s) Is there anything I should know?
Ok, how do I attach photos?lol.
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  #6  
Old 08-16-2016, 06:28 PM
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BigBoy740il BigBoy740il is offline
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Your cabby has two fuel level sensors hooked up in series. Unit one on the driver side simply twist out and can be cleaned with apple cider vinegar. Just soak in for an hour and gentle shake until the internal float moves smoothly from top to bottom. Unit number two in on the passenger side and is removed by loosening four 8mm nuts. Slowly pull the sensor out of the fuel pump assembly as to let the trapped fuel escape. Repeat the same process as before with the vinegar. You can test the gauge by grounding the pins. One pin will activate the low fuel light and the second will max out the fuel gauge. The pin goes the unit number one.
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  #7  
Old 08-17-2016, 04:11 PM
EddieBut EddieBut is offline
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Cool, thanks. A new project yay! I was getting bored.
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  #8  
Old 08-19-2016, 10:49 AM
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Rustneversleeps Rustneversleeps is offline
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so are the lipo batteries ER14250 3.6V are they a common battery going to be doing my gears and at the same time I may as well change the batteries and all the lights in the cluster....
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  #9  
Old Yesterday, 02:32 PM
EddieBut EddieBut is offline
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I don't know if they are common. I ordered mine from E-Bay.
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