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Hmm, I was always told by mechanics when I worked at a dealership detailing cars to never drown water under the hood without the engine running. You want the electrical current running as to not saturate components (wiring).
1. Get the engine moderately warm,not hot (a couple minute run at idle).
2. VERY LIGHTLY saturate the engine with the hose avoiding FICM, alternator, and air filter (they can get a little wet)
3. turn truck off
4. cover the FICM, alternator, and air filter unit (thicker foil was what we used because we could keep reusing it) with whatever you have that is water resistant/proof and will not melt.
5. spray down motor with mean green, simple green, or anything non corrosive. The also make engine bay cleaner which is what we used.
6. wait 15ish mins.
7. turn motor over and immediately start spraying it down while running until satisfied. (you will see steaming, this is good.)
8. then for covered units whipe with a damp washcloth unit satisfied (just water).
9. drive your truck until it is up to full temp then park it, the motor will dry itself.
*Note: Make sure the pressure of the water you are using is not too high. No pressure washing!
Again just one method. Hope this helps.
Last edited by Jweber6.0L; 10-29-2013 at 12:07 PM.