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Old 07-21-2021, 08:22 PM
djbmw1 djbmw1 is offline
Join Date: Feb 2021
Location: Ontario
Posts: 5
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E70 35d Diesel Throttle Body Repair

Your throttle body actuator is likely saturated with oil. Scan your car and see if you also have a glow plug/glow plug module issue as well that would also cause excess oil to enter the throttle body and, when you do the repair below to your actuator, be sure to also change your glow plugs and glow plug module.

First,.. remove your throttle body actuator and open up the protective cover. For an original BMW actuator, you will need to lightly hammer/tap a flat head in between the cover and the body and start prying/making room. On an aftermarket cover you can usually use pliers to peel back the corners as it's all thin sheet metal. Be sure to peel back the edges JUST ENOUGH to gain access as you will want to re-bend these once you're done.

Once opened, you'll likely have oil inside. Spend a good amount of time cleaning out ALL oil with carb cleaner, compressed air, paper towels, Qtips, etc.

Next, bring it over to your soldering station and be sure to use a magnifier lens or microscope. I'll let the pictures detail the rest:

I used a single strand of copper from a 10awg wire. You need to have a steady hand and be comfortable with soldering tiny components like this... but it'll get the job done!

PS.. to close it all up I first drilled a TINY hole at the bottom of the cover so that, if any oil gets inside in the future, it should have SOME chance to get out. Yes, this increases my chances of internal corrosion from moisture... but I figure it already has a decent coating of oil on it to prevent that :-)

I then used RTV to re-seal the cover... and bent back all of the edges. Allow to cure and re-install.
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