I have a 89 240 sx KA24E swapped into my 720. Its been in there for a couple years now, and has essentially been problem free. 2 weeks ago, I was pressure washing my engine bay for a show, not holding the wand close, but holding it back a ways and not focusing on areas of vacuum lines or electronics. I then drove the truck for a couple hours running errands and it ran like a champ, as it always did,
That evening, I stopped at a gas station to top it off and it was idling at 2200rpms. Its consistently idled this high and has run rich ever since. Every now and then it drops back to normal idle, but there isn't any rhyme or reason to that behavior, Its throwing codes 13, 14, and 41. it has thrown 14 and 41 since the swap, and likely will continue to do so being those sensors are in a garbage can. I've replaced the coolant temp sensor, and tested it not only at the sensor, but at pins 18 and 21 on the ecu, and it reads correctly. I had my brother jiggle the harness to see if the resistance changed due to a bad wire, but it held true.
Any ideas on what to poke at next? Im heading up to Tumwater Sunday for a show and I'l really like to have it back in tip top shape.
Thanks for any help