I purchased a 1989 325i from a guy who treated it horribly and am now doing a clutch replacement. When dropping the transmission I noticed 2 empty holes on the side of the bell housing that look like they should have sensors. From my research I believe these should be the engine speed and reference mark sensors. I see no cables dangling from the engine bay and cannot find any diagrams or videos online about where to connect these sensors. Should there be sensors in these holes? I have noticed the car seems low on power and am wondering if this could be related to that issue.
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Missing Sensors on Getrag 260?
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Did some further digging in the Bentley manual and found that only 84-87 325e and es models had the testing reference and speed sensors with the 88-90 325i and is models having the testing pulse sensor in the engine bay. Should there be a cover of any kind over the two sensor holes on the transmission? Looks like I’ll have to keep looking for my power loss issueLast edited by jnbentley26; 09-05-2023, 10:13 PM.
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Originally posted by AWDBOB View PostI've seen folks leave the old sensors bolted in there to seal the holes up. It's not the most elegant solution, but it works.
I cut the wires off the sensors as well.
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Originally posted by AWDBOB View PostNo cover- your car has been manual swapped (or someone just replaced a bad trans) and they used a transmission from an early e car.
I've seen folks leave the old sensors bolted in there to seal the holes up. It's not the most elegant solution, but it works.
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Originally posted by jnbentley26 View PostThe previous owner definitely poorly swapped it, it’s missing bell housing bolts. I don’t have the sensors to plug the holes, will it cause issues to leave them open? Thanks for the response!
There is technically a chance of foreign objects getting inside the bellhousing, but I've seen plenty of "inspection holes" drilled through and left open.
A lot of older Ducati motorcycles have a dry clutch (like a car) and run open clutch covers without issues.
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