Member, P500 Sport, DSC off (>900)
Join Date: Sep 2000
Location: Alpharetta, GA.
Thanked 1 Time in 1 Post
I'd have to say watch out for water in the engine area in general. I hosed off my E420 a couple years back, and even after covering everything electrical with bags, stuffing the intake, and spraying low pressure from the hose, I still developed a miss in the engine that lasted 2 weeks!
I had blown it dry with a leaf blower until there was no moisture visible. The engine looked just great - I was proud. One turn of the key however and it just bucked, sputtered, and died. I opened every electrical compartment looking for water and then took the leaf blower again and used it for 10 more minutes everywhere I could think of. Engine now started but with severe idle problems. I then let it warm for 15 minutes at idle to make sure all moisture was gone.
For the next 2 weeks, I had a miss in the engine! Finally I got fed up and took it to the dealer. Car was under warranty, so why not, right? He called me later and said "who took a hose to the engine bay?" He said it was quite apparent because there was still water in the bottom recess areas of the spark plug canals (after 2 weeks of driving). According to him, it was grounding them out on the engine block and cleaning would not be covered under warranty.
Bottom line? I was billed for 2 hours labor due to them having to dry the plug canals without removing the spark plugs, which is evidentally hard to do on that engine. He also said he sees way too many cases of blown ABS controllers by water damage, and that I was "lucky".
So now I have a 45,000 mile ML430 with an engine bay that looks like it's gone through the Australian Outback, but I'm not touching this one with water until I hear some miracle way to clean it.