Quote:
Originally Posted by kodioneill
You want to measure resistance (ohms). But even when in spec they can fail when warmed up. If the car has high mileage I would replace them. What's the problem with the car?
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Quote:
Originally Posted by vince_aust
John depends on whether sensor is installed or on hand. The sensor is an imbEdded reed switch with high power magnet. The manual advises how to test when installed and running - 2v sine wave on oscilloscope but I guess if it working why would you need to test it unless you suspect it's intermittent.
If you are testing on a workbench a ohmmeter with a piece of magnetic metal to trigger switch will give you a basic test result.
I replaced mine (87) simply because of their age and they switch on every revolution - car is 25 years old so not replacing them was inviting a breakdown. When I removed them all the insulation was broken down due to location near exhaust. They are identical units
These are cheapish! - you only need to buy the cheaper version for BMW or the 928 about $70 from pelican. Use the search tools - there is heaps written on this issue
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It started out as an intermittent problem, not starting at times. I have checked the dme relay. It's not that. Furthermore, I even replaced the dme relay. I have verified voltage at the coil black wire. I have verified continuity of all related wires back to the dme. I have even swapped out another dme. I have verified fuel at the rail and you can smell it when excessively cranking. I have verified with a timing light no spark. I have air, fuel, but no spark.
This is why I am looking at the reference sensor. I looked in the Bently manual but apparently missed it. I have searched but e is a ton of stuff on "my car won't start" I am looking for a specific item. I will search and read further.
The sensor is in the car. I have another used sensor which is why I wanted to test. No point in putting in if it's shot.
Do you have a part number on the cheaper ref sensor?
John