[teklokster]

Hi everybody,
What sparkplugs should I use on my 94 grand Cherokee. For better performance. 5.2 L v8

[Boodyrider]

Originally Posted by teklokster

Hi everybody,
What sparkplugs should I use on my 94 grand Cherokee. For better performance. 5.2 L v8

Um... new ones?

Spark plugs DO NOT improve performance. Old, worn out, or incorrect heat range or incorrect gap can HURT performance, but plugs of the proper gap and heat range will all work about the same.

Use factory recommended, and then buy according to quality. I HAte Bosch, the ends unscrew. I like NGK and Champion.

[teklokster]

Yeah I'm new to jeeps. Just bought mine and I want to throw in new ones.Off topic. Does the exhaust system (flowmaster) help performances mpg?

[ratmonkey]

Some plug designs and materials do improve performance. Its been dyno proven time and again. That said, champion copper core truck plugs are your best option for stock.

Read up on indexing, get a set of indexing washers from summit and point your plug gap at the exhaust port. Good for some efficiency increase.

[wickerham]

copper core Champions.....if you're REALLY lucky Champion Truck Plugs {think I got some of last ones made }

[melk]

Does the exhaust system (flowmaster) help performances mpg?

A new muffler by itself... probably not. What will help is a new high-flow cat, muffler and O2 sensors.

[melk]

Does the exhaust system (flowmaster) help performances mpg?

A new muffler by itself... probably not. What will help is a new high-flow cat, muffler and O2 sensors.

[teklokster]

Originally Posted by wickerham

copper core Champions.....if you're REALLY lucky Champion Truck Plugs {think I got some of last ones made }

ill keep an eye out for those plugs thanks for the info

Originally Posted by melk

A new muffler by itself... probably not. What will help is a new high-flow cat, muffler and O2 sensors.

will look into that thanks melk