I got on a while back with a code 52 so I was thinking knock sensor....right? Well, I got all the parts and was planning on doing it this weekend when my CEL went out today. I thought it was strange and then noticed that my oil pressure dropped and would fluctuate during throttle. I also notice that I was overheating/my temp was way up, but would drop back to normal during throttle or maybe while the vehicle was moving. I don't know what's wrong anymore and I just bought all this parts.....I guess they're returnable, but what's wrong with the 4runner now? I'm going to try and tackle whatever the problem is this weekend if I can figure it out in time. Thanks for any help

 

first things I do with any electrical problems -> check your charging system (over, under, fluctating voltage) and make sure all the grounds are good (battery to body, battery to engine, body to engine, all of them)

 

x2. Sounds like a loose ground. As for the cooling issue, check coolant level, and the t-stat.