P0300 Code along with a check engine light and misfiring after washing engine today..

[69mock1]

So I washed my engine at the local "high pressure" car wash today and now its misfiring on acceleration, pulling a code p0300 and the check engine light will flash, other times it stays on continuously, (mainly it flashes though while the engine is running..))

Ive taken compressed air to ALL/MOST of the under hood electrical connections including the plugs, wires, and coil pack however its still acting up.. Figured Id let it sit a bit and hopefully let it dry over night,,,, however that would be doubtful with 0 degrees temperatures over the next 10 days....

Can anyone chime in here please...?? Seeking advice...

[69mock1]

I just took the car out after letting it sit for a few hours. Upon starting it, the engine light stayed on SOLID.. As soon as I pulled out into traffic and hit the gas it started misfiring and (backfiring out of the exhaust I think) and the check engine light began to blink...

Early today while troubleshooting----- while the motor was running, I pulled each plug wire one at a time off of the spark plugs.. I could hear the "tic tic tic" coming from the plug boot while it was in my hand so it appears as though they're each getting a spark, its just as if the spark timing is off i guess as the motor is put under a load.

I did replace the water pump, timing belt etc etc 2 weeks ago but the car drove fine until my pressure washing of the motor this afternoon.........

[camopaint0707]

I got this on my G8 today. I cleared it and it hasn't come back yet.

[petrified.rabbit]

its most likely the plug wires if not the coil pack. They are the only two things effected by water that do what you describe. I wouldn't be touching them while it is running. The have a good jolt, and pulling them while running will cause more problems, codes, etc.

[69mock1]

Well 120 dollars later (for a coil pack) and the car is still missing on acceleration and the engine light is still blinking.....

I don't want to pour all kinds of money replacing everything in this car until i hit it correctly...........

[69mock1]

Fixed.... Plug wires...

[petrified.rabbit]

I did say wires first. Glad it is fixed.

[69mock1]

Thank you for the advice.. ����

[petrified.rabbit]

if its the same day, and the coil pack is clean, you might be able to return it. If for nothing else you might get store credit.

[69mock1]

Already returned it...