Just changed my plugs yesterday from Motorcraft Platnums to NGK TR6. The second third and fourth plugs on the drivers side looked alittle lean. All the rest looked alittle on the rich side or normal. What could cause these three to lean vs. the others? What can be done to just those three to correct it?

Also, what is a good valve body for the street? How much? Where to find?

Tim
4#
Preditor
K/N Kit

 

Unless you did a WOT run and then shut off the engine I would not worry about reading your plugs. Your trucks computer keeps the A/F ratio at around 14.7/1 most of the time and will make the plugs look lean. Also after a WOT run the computer almost cuts off all fuel and acts as an air pump on decel.

Zach@D.I.D Race Engineering

www.didraceengineering.com

 

Sounds like fuel injectors getting clogged.

Any of the big vendors have a good valve body for the street.

 

^
What he said. If you didn't shut down right after a decent WOT run, then reading the plugs is useless, as they should all look lean. You may be able to see signs of detonation though.

 

factory tech valve body, accept none other.

 

Hmmmmmmm

 

Thanks, for your imput guys...