spark plug terminals

[motozine]

Hello,
i just got new ngk plugs but it has different terminal shape so it won't fit with current wires.
Did i order the wrong plugs? or it is just new plug terminal shape so i need to order new wire sets?
If I need to order new sets of wires please recommend good one to use. Thanks.

New


Old

[rowdie]

The tip should unscrew exposing the threads.

[Genbiltstein]

+1. It has been my experience that.
The higher quality automobiles will have threaded terminals as a rule of thumb.

[tecqboy]

My 59 Rambler that I drove during college had threaded tip plugs. What a great car!

[motozine]

thanks so much for info, was simple unscrew to expose the threaded terminal.

Found one bad plug, now car runs much better but still slight rough idle.

[TOPGUN]

You didn't mention the model of the car. Usually the wire has 2k ohm resistance built in. I would check this. I had a slight miss at idle. One wire was open,but would still fire the plug. A new set of wires (BERU) cured the trouble. Check the rotor and cap for cracks, corrosion and carbon tracking. Good Luck.

[motozine]

oh, it's 86 model. ok will check the rotor/cap throughly.
thanks.

[Genbiltstein]

There is a science built on spark plugs.

There are "cold" and "hot" plugs.

Then there are those that complete the gap within the body of the spark plug.
If you are only driving the car for short drives then I would recommend a hot plug. Yes a hot spark plug. One that would fire and run quickly.
If you want to frequently take it on the highway then a cold plug will do you.
The automotive industry allowed for the difference.