I recently changed my plugs (copper ones) and plug wires on my 300e. Everything was fine for a week then all of a sudden when I shift into reverse or shift into drive with my foot still on the brake theres a few hickups in the idle but once I get moving all is fine. Do you think the ovp realy may need to be looked at? Im planning to change the fuel filter too so i'll see if that helps any. I know this might sound wierd but before I changed plugs and wires the car felt stronger off the line. but top end is better. I guess what I mean is the car feels a little more softer when flooring it. I guess the saying if it aint broke dont try to fix it holds true .

Not to insult your intelligence but are the plug wires connected properly (all the way) on the plugs? I usually spray a little penetrating oil inside the plug wire boot to ensure is snaps on tightly.

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Scott Diener
89 300E
93 300E
92 Volvo 740 Wagon aka "Mutt mover"

You replace the plug and wire for a while, and run ok, so, I don't really think you plug the wrong wire to the wrong plug.

ok, you press on the brake and reverse? isn't it? well, I think you can check your wire, whether it have a good conduction to the plug and the distrubutor, it possiblly causing by the bad connection, so the spark is not strong enough in high tourque condition, and may be you can try hard acceration, then you might feel it miss fire, this is also the same thing.

I have this situation before, but not in the Mercedes.

hope this can help.

DOes it idle smoothly in Park or Neutral?
I know there is some engine connection of some sort that is hooked to what gear you're in (D, R, or N/P).
Don't remember what it's called though.

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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!)

Well out of curiosity I added some redline fuel injector cleaner . Didn't help much. I also checked to make sure all wire connectors were secured but no change.

How wide did you gap your plugs?

Sounds like the ovp relay to me. I had the same problem in the past and replacing the relay solved the problem. They are relatively easy and cheap to replace.

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jayhawk

But where is it located? and how could we check if it working or not???

Gary,
Do a search on the OVP... you will come up with EVERY LITTLE PEICE OF INFO you could ever want about it.
In brief it's a commonly faulty relay... called the Overvolt Protection Relay. It can be changed yourself (simply unplugs and plugs in) under the hood, and can be had here from partsshop for about $50.
This topic has been BEATEN to DEATH!!

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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!)