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I just cleaned my engine using the following method I found on the forum and I had no problems. I didn't use a lot of water and didn't spray things like the alternator. I did it to my C5 which was very dirty. This isn't something I would do to the car if is just a little dusty. JMO.
There will probably be some folks who will poo-poo this method - but it has worked for me on all my cars with no problems at all - ever.
I would not do this on a LT5 or any opti-spark car. C5's are fine.
Here it is....
1. Spray down the engine compartment with the hose (I took off the fuel rail covers and made sure to get everything free of loose dirt and dust).
2. Then close the hood and start the car and let idle for about 5 minutes to warm it up and then shut it off.
3. Using Simple Green (Full Strength, no dillusion), amply spritz everthing you want clean.
4. Close the hood and go drink a beer (or in my case, wash the Fuel Rail covers with hot water and Dawn and let dry).
5. Next spray out the engine compartment completely.
6. Spray Armour All or equiv over those same surfaces. Avoid the belts and wiring. Use alot on the fender covers and the radiator shroud.
7. Close the hood and go and Spray Armour All on the Fuel Rail covers.
8. Open the hood and reinstall the Fuel Rail covers and your done.
Won't take more that 20 minutes and your engine will look like it just came off of the showroom floor.
I use CD2 engine detail kit which includes a can of cleaner (like gunk) and then a detail spray that puts a resin coating on everything. Looks great and some K-marts have it as well as some Auto supply stores. I ordered a case using the Internet after K-mart ran out.
If I dont want to do it by hand CD2. If I do it by hand, I wash then wipe everything down and dress all the black plastic with my silicone free dressing.