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Stuff a couple of rags under the intake manifold BEFORE cleaning (near the throttle body), to ensure that you don't get a bunch of water in the knock sensors, and don't spray a lot of water near the injectors or where the manifold meets the heads. You can clean that area by hand very carefully if you are worried.
Also, be sure to cover the pulley/bearings and the alternator with tinfoil to prevent them from being degreased.
I just washed mine a couple months ago. Used a pressure washer and some simple green.
Pointed the nose down on my incline driveway.
Rinsed it down with the power washer.
Sprayed simple green on the engine and let it sit.
Turned the car on and then re-rinsed with pressure washer.
Then used my air compressor and dried up the excess water.
Car still run great. I'd recommend a pressure washer since it shoots out water at a higher velocity but actually spews out less water...I didn't cover anything. I didnt spend long periods spraying the fuel rails or PCM area either...
2000 A4 Z/28 Camaro: My Constant Work In Progress Project Car
Any Chevrolet Can Be An SS, Only A Camaro Can Be A Z/28 The Brand Of Your Car Doesn't Matter...As Long As It's Fast!
ive done it twice...my engine is totally stock looking and not really that dirty but when i clean it...i just spray engine degreaser, let it sit and then spray it off with the hose....i dont hit the alt or the PCM that much but eveything seems to work fine after..
and i spray the **** out of eveything else to get the degreaser outta there.
i have literally washed probably 2500-3000 cars engine bays. i do mine in my camaro once every couple weeks. having the car pointed downhill works to keep water from sitting in the knock sensors... pressure washers are fine just dont be stupid and sit the spraying something for 5 mins lol. with a pressure washer it doesnt take much to get it clean
__________________ 2001 z28, bolt ons, bolt offs, spray, stripper model, 3225#s a little spray. going for 10.50s bolt ons and spray