When washing an engine you have to be careful any seal on the electrics can be weak and water can get in this will disrupt the signals the ecu uses. you will need to remove one by one every sensor cap were the wiring goes in and check there is no water in them, even the ecu connection, any water found dry out and replace the seal as its weak, you have to be careful when washing engines they don't get that wet in normal running, i usually steam clean the engine bay as this does not use excessive amounts of water and removes oil and grease better than water on it own.
SOURCE: Misfire on cylinder 1 and 3
Do you observe abnormal idle speed? It may be just an indicator fault; not a really engine firing problem.
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SOURCE: i washed engine and after a short run engine
Are the plugs in the center of the cylinder head? About 6 inches/ 10 Cm. Look carefully in the plug cylinder ports make sure there is no water next to plugs (this happened to me with a car once)
You can try a rag pushed down (hold a corner) with screwdriver or hairdryer. Otherwise they sell electrical drying spray at parts stores. Good luck!
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