I have been having a problem with my intermittent wipers ( all other wiper functions operate as normal)... sometimes it is a very brief delay(1 second), sometimes it completes a "double-wipe", and sometimes the delay is 30 seconds or doesnt work at all. Is there a relay (potentially faulty) that controls the wiper delay? Could that be the problem? Or could it be just a bad contact somewhere? I've had my '94 C220 car for a month and just noticed this problem because it hasn't really rained around here for a while. Thanks in advance for any tips.

If your car has the rain sensing function, have the sensor checked...I had mine replaced at 20k on my 230...oh.....did you happen to have the car washed recently before this happened?

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00' C230K
88' 190E 2.3
79' 280CE (Sold)
84' 300SD
73' 450SE
93' 300E
68' VW Bug (what the hell was I thinking!)
99' HD FLSTF

It's your wiper.hazard relay. Mine did the same thing. I almost ordered a new one... but I realized it started working again after I took out the relay and then put it back in. Open up the fuse box cover (under the hood), and then remove the 6 phillips screws that hold the covering to the fuse bock (and panel directly behind, same panel). It is a black relay behind the cover behind the fuse panel. Don't recall the part number. Do a search (I have asked a question about this before), or ask Phil (888 #) or search FastLane or PartsShop for the part number. Try moving the relay around with the INTERMITTENT wipers on, and see if they turn on. Just play around with it a little. If you can't get it, you'll have to order a new relay, I think about $75.
GOOD LUCK!

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2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)

I didn't know there was a rain sensor. Is this standard on all or an option?

There is NOT a rain sensor on your car.
You didn't list your model car (C220), so he thought you could have a sensor, but it wasn't available.

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2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)