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No fuel in #3, but #'s 1, 2, & 4 200

I decided to start a new thread on my '89 240 as I've discovered a significant new clue.

Here's the rundown:

The engine is running very rich (gas in the oil rich) and rough but no codes. This started suddenly after my wife ran over a branch but I don't see any connection.

I swapped injectors, MAFS, ECU, plug wires, FPR, & oxygen sensor.
I disconnected cold start injector, verified coolant temp sensor reading @ ECU, routed fuel return line to jug in case it is plugged.

Very recently the primary fuel pump and filter were replaced, oil changed, throttle body cleaned, all connections triple checked.

I have now determned that plugs 1, 2, & 4 are black with soot while #3 is dry.

Spark on 3 but no fuel, meanwhile 1, 2, & 4 are very rich!

How does this happen?







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New No fuel in #3, but #'s 1, 2, & 4 [200]
posted by  LoveMy240Wagon  on Tue Dec 6 18:11 CST 2011 >


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