MonsterBilly

my car is running rich, however what are your opinions on my plug conditions. several of them are very red!

they are #ed and the pic is as if you were at the front of the car looking at the engine.

with the new plugs, there is a stammer when i give it gas thst was not there before.

LindenBruce

Okay, the old plugs first. From what I can see, the red coloring is most likely fuel additives. As long as the plugs are not showing signs of running to hot within their heat range. That would be visible with little glassy spots all over the center electrode. As long as that's not there you are in the right range. There are some carbon deposits too, which is common on a plug with a long service life. Running rich would mean your plugs are covered by a black soot. Or they would have a damp appearance when you pulled them out.

Now the new plugs. As long as you made sure the plugs were properly gapped properly and are of the same heat range as your old plugs, changing plugs would not cause your car to stumble. Did you make any other changes at the same time you changed the plugs? Like the points maybe? If so, check the point gap and use a dewell meter. That maybe your problem. Even a loose primary wire under the cap or a bad condenser could be an issue. Bruce

MonsterBilly

nothing at all was changed other than the plugs. They are the same plugs that came out and the gap is the same. .04 also i am running an MSD with astreet fire box. i will check for loose wires.

MonsterBilly

by the way. thank you for your response.

LindenBruce

Any time dude. With that ignition box anything can go wrong. When you place the engine under a simulated load, does it miss? You can simulate a load by applying the parking brake, blocking the tires, then place the trans into drive and while standing on the brake pedal give her a little gas, say up to about 1200-1500 rpms. The idea is to load the engine, but not break traction. Bruce

MonsterBilly

ill try tomorrow

kalli

very hard to say from the tiny picture. i only see the color.
but the good news is they all look the same

can you get a big picture (massive) from just one plug (the new ones) that shows the thread, the center electrode and as good as you can inside

Kalli

JMD

http://www.dansmc.com/spark_plugs/sp...s_catalog.html

From 1977, ,,,,

urban_cowboy

The engine may be running a little rich, but I have seen much worse. If you look closely at JMD's link, you can see that the red color is achieved as the plugs begin to show rich. If they are black...then you are way off.

67mustang302

They're quite rich. With modern additives you should have a reddish or brownish tinge, and properly tuned often it's not even all the way around the porcelain.

Heat range, clean the plugs off. There should be discoloration from heat down about the first 2 threads on those plugs, farther and the plug is too hot, not down that far and it's too cold.