Grimes

iTrader: (3)

I aim a hose at my engine bay when i clean it off- you're fine. Knock sensors go bad even with regular use....think about when you drive in a rainstorm.....water gets thrown everywhere. GM actually does hosedown tests on cars too.

I've done the engine bay cleaning every summer for the last 3 years, and zero problems!

GMC_DUDE

The risk of rusting the knock sensors is all the more reason to fire that puppy up ASAP and let it run for a good while. Let the engine get good and hot and it will evaporate all that water so that it doesn't cause any corrosion.

alsfastz28

Blow off with air hose and compresser dry mas air and tps senser gm says it is not good idea if these get to wet.