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Old 07-30-2010, 09:11 PM   #1
teklokster
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1994 ZJ 
 
Join Date: Jul 2010
Location: california
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Spark plugs
Hi everybody,
What sparkplugs should I use on my 94 grand Cherokee. For better performance. 5.2 L v8
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Old 07-30-2010, 09:22 PM   #2
Boodyrider
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Quote:
Originally Posted by teklokster View Post
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.
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The technical advice you get from me here is worth exactly what you paid me for it. Warranty issues will be reimbursed at double what you paid me for the advice.
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Old 07-30-2010, 09:40 PM   #3
teklokster
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1994 ZJ 
 
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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?
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Old 07-31-2010, 02:48 AM   #4
ratmonkey
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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.
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Old 07-31-2010, 08:00 PM   #5
wickerham
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copper core Champions.....if you're REALLY lucky Champion Truck Plugs {think I got some of last ones made }
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Old 07-31-2010, 08:19 PM   #6
melk
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Quote:
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.
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Old 07-31-2010, 08:23 PM   #7
melk
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1996 ZJ 
 
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Quote:
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.
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Old 07-31-2010, 08:53 PM   #8
teklokster
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1994 ZJ 
 
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Originally Posted by wickerham View Post
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





Quote:
Originally Posted by melk View Post
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
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