Ok, I usually use diluted Simple Green and the CD2 detailer. I spray the Simple Green, let it sit for a couple minutes and then spray it off with a hose. (I cover up the important electronics) I've done this 2 or 3 times total.

Fast forward to me getting a SES light. It was the code for the front knock sensor. Upon removing the intake, you could see where the water had seeped under the intake and corroded the front knock sensor. It was rusted and looked like crap. The rear one was still gold and looked perfect. I replaced both knock sensors and made a new harness and installed it. I then followed the service bulletin on applying RTV sealant around the grommets to prevent water from seeping back down to the knock sensors.

Now, if you have never pulled your intake off, you will probably break off the oil pressure sending unit. Only way you won't break it is if the "gods" are looking down upon you. So, if you are going to swap your intake, go ahead and buy an oil pressure sending unit for insurance. By breaking mine after all the dealership parts places closed, it had to sit in the garage at a friends house all weekend. Big props to him for helping me and letting it sit in his garage.
While I didn't have the Z28, I had to drive the beater car... the Z06.

Just a heads up for anyone who washes their engine.

 

I drove around for a couple weeks without a oil pressure sending unit with no ill effects. Just a little scary to see no oil presure on the gauge.

Justin

 

I dont like the idea of using CD2.. ive seen funky looking aluminum (block, heads) on peoples cars that have used that for a while (seems corosive).. Im very happy with simple green and car shampoo.. then a dry off with my 200mph leaf blower then compressed air.. almost no towel drying needed

Yea, I broke my Oil sendign unit putting my intake on

 

WOW! you must have really been reefing on that intake to break the oil sending unit. My intake has been off a few times and never once had a problem (knock on wood).

I have never once had a problem with water getting into the knock sensors until recently. I dont ever wash my engine either, but the car does sit outside in the crappy washington weather, so I am guessing one finally got some condensation in it and lunched one. The intake will be coming off aagain once I get the car back from the cage builder to try and fix the problem.

 

I didn't realize you could break it by taking off the intake. I had read up on the intake swap to give me an idea on what to watch out for. I was concerned on breaking it on the reintalll, not the removal. We didn't pull very hard but I think the brake booster hose was caught around it and that's what broke it.

What a PITA fix for the knock sensors.

Although, when I turned the key and she started...

 

and that my friend is what is most important!

 

I just super glued mine when I broke it.. It worked like a charm..

 

Haha, superglue and duct tape, the answer to every little problem

Rob

 

The thought of super glue did cross my mind but... I wasn't sure how the OPSU worked. I decided against it since I definitely didn't want to go through the hassle of the removal and install of the intake again.