C32 AMG, C55 AMG (W203) 2001 - 2007

2002 C32 washed motor 3 months, miss at idle

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Old 03-02-2021, 08:54 PM
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C32 AMG 2002
2002 C32 washed motor 3 months, miss at idle

My C32 misses only at idle and only cylinder 3. It also keeps CEL on with b1&2 #2 sensor heater circuit fault.
I unplugged all four o2's tested heater circuit voltage all read 8.35 volts unplugged and plugged.
I swapped cyl 1&3 fuel injectors, coils, spark plugs and wires, still #3 and only idle. Just touch gas peddle no miss.
Any ideas?
Old 03-03-2021, 01:12 PM
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C43 AMG with a tune up
Did you wash your engine when it was hot after a drive?
You got lots of water in the ignition system
Old 03-03-2021, 01:40 PM
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C32 AMG 2002
I started it cold and right to car wash, 3 miles. Waited to do engine about 5 minutes and tried not to spray directly on top of engine. I had just replaced valve cover gaskets and trying to clean sides of engine. I've taken the ecm out and apart No sign of moisture stains. I've replaced all four O2's. It's been going on 3 months with it not being driven.

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