Been a long time fan on here and I have been working on my03 taco with the 5VZ FE in it. I recently had issues with the truck starting at all after a heavy rainstorm. I also noticed that the battery died overnight. I realized I had some parasitic draws. I managed to narrow it down to the EFI circuit and the ECT. I also realized water had got in the cab, So I sealed it up really well and pulled everything to let it dry.
Things i've done so far after it dried.
1. Check for spark - Good
2. Checked that I had fuel pressure to the rail - Good
3. Pulled the computer and realized it was full of water, cleaned it out and cleaned up the contacts as best I could. (Parasitic draws went away)
What else can I look at? The truck will just crank over and over. I did manage to get it started for a second by spraying starter fluid into the intake..
Im leaning towards a dead computer but wanted to see what else I could check before spending 100 of $$ on a computer.