I just replaced the plugs myself, with Super Copper Bosch, no problem on initial start up, no problem once moving, what should I check for?

Do you think it might be carbon build up on the pistons?

The spark plug connectors had light oxidation/rust on them but seemed fine. Should I replace?

Thank you very much for any suggestions offered.
Mike McKinney

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1989 300CE - 269,000 km
1994 SL600 - 59,000 km

Mike-

I wouldn't worry about anything just yet, get her out on the Highway and get her opened up a little bit. If things were fine before you put her to sleep for the winter then it shouldn't be anything to major. You could run a bottle of fuel injector/carburator cleaner through the gastank too, that might help. good luck

-Aaron

try some injector cleaner and give her a good ol winding out on the highway for a bit.

That should get her cleaned up a bit.

Then do the usual, oil change, and refil the tank.

That should hopefully get you cleaned up.

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon

Thank you guys for your advice and for the reassurance.

I am getting a sparking noice and seeing a small spark in the 5th out of 6 spark plug connectors. This is just after I have installed the new plugs!!! What have I done???

Please advise, thank you.

Mike McKinney

__________________
1989 300CE - 269,000 km
1994 SL600 - 59,000 km

sounds like its time for new wires. if a aprq jumps outta the wire, then I would say change em. that could be causing your miss.

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon

Yes it was indeed the spark plug connector causing the miss.

I have temporarily fixed it with electrical tape.

It will be enough to get to Foreign Car Parts for the new plug wires and connectors on Monday.

Thank you for your help Ashman.

Mike McKinney

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1989 300CE - 269,000 km
1994 SL600 - 59,000 km

If you want the best fix for the least money, just replace the plug resistor itself. The factory originals can be purchased aftermarket and it leaves you with everything top quality. A set of wires will require a lot more work, a lot more money, will be hard to run as originally laid out, and unless you know how to buy right will leave you with a POS.

If you just like spending money replace all of the ends. If you just wish to fix the car (since you have been able to locate the bad one) only replace the one in question.

The job is very, very easy if you follow a couple easy tips. The main problem you will encounter is that the end will not properly unscrew from the wire. The plug wire has a male metal electrical connector made to the end of the wire. It is a separate part with a MB part number but you do not want to have to replace it (just a lot more work). The problem is that like a lot of screwed together things it takes a certain effort to break loose. This effort will usually rip the wire from the metal end (which is screwed to the female end of the plug connector.

To solve this problem, take a knife and slice the rubber boot that is part of the old plug connector. Remove the rubber and there will be about an inch and a half of white ceramic before the metal heat shield. Take a pair of strong pliers and with a rag covering the ceramic sqeeze the rag till the ceramic shatters. Pick away the pieces. Watch out they are as sharp as glass. You will now have the metal connector exposed and it is easily turned at this point so that no stress is placed on the wire to connector union.

Soap up or lube with silicone the old wire and install into the new connector and tighten till seated (lightly - it will be apparent).

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician

Thank you for the tip. To be honest, I am scared to try pulling the plug wire boot apart. Could I just buy one spark plug wire separately and give it a go myself???

If not, can I chop the boot, off and by a new one? The spark plug wire ends, in the boots are oxidized, but clean. Should I replace all of them?

Please advise steve, and thank you again for your help. Very much appreciated.

Take care,
Mike McKinney

__________________
1989 300CE - 269,000 km
1994 SL600 - 59,000 km