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Cap'n Carageous 05-27-2002 07:13 PM

Well now, This looks suspect!! Flywheel sensor
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Before my troubles with transmission, which led to reworking the head and other unsundry repairs, my 300e was experiencing driveability problems; check engine light on and of , intermittant skip, all the things we say a new OVP will cure but didn't. As I'm putting this animal back together, I notice that the flywheel position sensor has a problem. Could this be the source of my woes?

chowpit 05-27-2002 11:30 PM

It may not be entirely the source of your woes but it sure won't hurt to replace it. Those sensors use a shielded wire to prevent outside electrical interference.

Cap'n Carageous 05-27-2002 11:44 PM

Are there two wires in there or one? I can't tell since this thing is such a mess. If there's two, then it definatley shorted .

Cap'n Carageous 05-28-2002 01:19 PM

Can anyone tell me in simple terms ( for other people , not me of course) exactly what this does and how it works?

per eriksson 05-28-2002 04:04 PM

It senses a metal pin or stud on the flywheel and generates a pulsing signal each time this pin passes and gives this signal to the egine control unit and such so it knows crank position and rpm. Very sensitive apparatus and yours do not look healthy at all.

engatwork 05-28-2002 08:56 PM

It functions like a proximity switch cap'n.

Cap'n Carageous 05-28-2002 11:08 PM

Now Jim, you know that I know all about proximity switches, heck, we damn near invented those things!!; But what about all those less fortunate than us? Can we get this down to a level that even a novice can understand?? I just can't find the words right now!;) ;)

mikemover 05-29-2002 02:06 AM

I'm guessing here since I've never messed with one, but I'd say it sends your ECU (the engine's computer brain-thingy :)) the exact engine RPM....Without such information, it probably has trouble adjusting air/fuel ratios, timing, shift points, etc. correctly.

But don't quote me.... ;)


engatwork 05-29-2002 04:31 PM

Cap'n - I figured you would know what a proximity switch is :).

MIKE FREEMAN 05-29-2002 06:05 PM

The flywheel has segments of steel that stand away from the main body of the flywheel.
As these segments pass by the sensor an ac sine wave is formed,the ignition control unit detects this wave and with load and r.p.m. inputs determine when to fire the spark!
Replace the sensor!

Cap'n Carageous 05-29-2002 07:15 PM

Phil has already given me the info on a new one(ouch!!!). Back to my original question... Will this cause skipping and "check engine light" to come on?? I can't find even a mention of this gizmo in the CD. But then again, my luck finding anything in that CD hasn't been too good:o .

mikemover 05-29-2002 07:44 PM

If it's supposed to be sending the ECU spark timing info and it's not, then I'm sure it's causing the stumbling and "check engine" light to come on.


Cap'n Carageous 05-29-2002 11:06 PM

I have been told by two local "experts" that the 89 300e has no diagnostic capability. Error codes are not stored. Even the service CD states that the California model is the only one that has this feature. So does it or doesn't it affect performance??? Surely somebody can answer the question.:confused: :confused:

mikemover 05-30-2002 12:22 AM trusted local mechanic says....YES!


mplafleur 05-30-2002 10:17 AM

When I rebuilt my motor, my hall effect sensor looked about the same. The cable covering had pulled away from the sensor body and the two wires were exposed. Since they were still intact, I installed the sensor. That was 20k miles ago.

Are the wires still attached, or are one of the wires broken?

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