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Engine speed signal missing...encore

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After getting my 90 se back from garage for new belts etc. I noticed my CEL with an intermittent code 41 for first time since owing her.  Cleaned all connections on DI module,checked wiring to the ECM and checked voltage at ecm terminal ( 4.95 v) but still get the code. Apparently the mechanic accidently spilled coolant on the DI module/coils. Could this mean a new DI module/coils?



90 SE

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The new sensor didn't do the trick, still coding 41. During the process of reinstalling the old sensor I accidently dropped the 10 mm bolt and washer into the crank case. Cant seem to find the parts even with a scope. I would like to avoid taking crank case apart Is there enough clearance for the flywheel to clear any debris at bottom of casing?

90 SE

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Do not leave them in the bell housing to bounce around and damage something. At high rpm the bolt could possibly be thrown through the side of the casing.

Attach a neodymium magnet (25 mm diameter by 8 mm thick will work) to the side of the clutch cover and rotate the flywheel 360 degrees and hopefully it will ‘collect’ the bolt and washer on its way around.

Edited by sailorbob
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