Time for a tune up

[AbnMike]

I'm guessing that the deposits are from a 40 year old original engine with 90,000 miles. Anyone see anything else?

Luckily I broke the distributor wire and got to tinkering else I wouldn't have pulled these.

 

[bavbob]

For an M30 running on 5 cylinders, the plugs look decent for their age.

 

[AbnMike]

For an M30 running on 5 cylinders, the plugs look decent for their age.

Ha. There was one other plug but it was relatively clean and didn't add anything to the picture.

It had started dieseling a bit so I knew something was amiss in the plug department.

I went ahead and splurged on new wires, too. Figured if one was brittle enough to break and had green coppering then the rest were probably not too far behind. I think they were replaced in 2005 so it was time.

 

[DerSchwede]

Hi, as the wires these days have built in resistors you might get stronger spark with plugs without resistance... For instance W7DC (w/o R)
Cheers
Anders