Hi:
I was in the process of changing out the plugs on my 99 C230K. This is the M111 motor on the w202 chasis.

The job was going well....

I got the first three plugs out fine. There are two plug boots and two coil packs, on top of the other two boots.

When I removed the second coil pack, the coil pack came unplugged from the boot. On the first coil pack everything come up together.

I cannot get the sparkplug boot off the plug. I tried some gentle pulling with
pliers, but did not want to damage the boot.

Any ideas? Is there a tool that can get inside the spark plug channel?

I plugged it back in, put the cover on and everything is running fine, but I have three new plugs and one old plug.



Note: the engine was somewhat warm when I did this, not too hot too touch and work on, but not overnight stone cold either.

Thanks

Pull harder. I don't see how you can break it. It's just stuck.

__________________
1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra

the worse you can do is break plug wire if its really on there which has happened to me. try rotating the wire or give the boot a good a yank. i would put some dielectric grease on the boots so it doesnt freeze up. I do this on all my gas cars everytime i do a tune up and not a problem.

__________________
1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)

The connector in question is not a wire. I have taken one apart and I believe it is indestructable.

__________________
1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra

I've broken them before, sometimes they come out and sometimes they don't. OEM versions of the plug seem to be better but I'd guess 10-15% of the time the connector seem to bind with the spark plug for some reason.

The good news is the replacement plug is pretty inexpensive, but they should stick to begin with.

__________________
98 Dodge-Cummins pickup (123k)
13 GLK250 (135k)
06 E320CDI (323K)
16 C300 (62K)
82 300GD Gelaendewagen (54K)

a few things come to mind, I know alot of techs use an air gun to install spark plugs which is a bad idea. Carbon build up or coolant could be freezing it through electroylsis.

__________________
1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)