Take the ecu apart!!

i have inspected mine before and it looks great. i leak water all the time right onto the ecu through rust holes.

i double bagged the ECU to keep out the water.

the nuts are easy to remove on the ECU but you may need vise grips.

look at the circuit board. you will see a burn mark if water got on it. it will be very obvious most times!

i guess it could be the ECU but that would be a guess. do you know someone local with same vehicle and you could swap ecu's to check it??

Good Luck.

smile