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Unread 08-28-2011, 08:06 PM   #1
HMS
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Too many types of spark plugs..............

What is a good middle of the road spark plug for a 258 motor? I see platinum,
irridium, dual tips, quad tips just too many choices. BT I'll be doing a team rush as I get the extra $$$.

Howard

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Unread 08-28-2011, 08:17 PM   #2
adams1985cj
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I have always run Bosch Platinum in my CJ they have always worked well for me and the price is only around 2 or 3 bucks.
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Unread 08-28-2011, 08:18 PM   #3
MoC
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Stay away from platinum and Bosch. I like copper Champion Truck Plugs.
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Unread 08-28-2011, 08:19 PM   #4
Ken4444
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In the 258, you always want to run a standard, old-fashioned, copper core, resistor-type spark plug. The Autolite 985 is readily available, low-cost, and works great.
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Unread 08-28-2011, 09:19 PM   #5
keith460
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I second the Autolite 985's as well as Champion Truck Plugs. Steer clear of Platinum, Irridium and other plugs meant for high energy coil on plug type ignition systems.
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Unread 08-28-2011, 10:22 PM   #6
Pacfanweb
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Autolites, and you don't want anything but Copper.
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Unread 08-28-2011, 11:27 PM   #7
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Copper, ask me how I know.
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Unread 08-29-2011, 01:25 AM   #8
Cutlass327
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Copper, basic, Autolites. So you have to change them every 30k, so be it. There are other things that need done about that time anyways - brakes, lube the dizzy pad, etc.. These vehicles were not designed for long maintenance intervals.

Those fancy plugs are just that, a fancy plug. Bosch Platinums have the anode flush with the ceramic, shrouding it to a pinpoint piece of metal. They foul easy, too. The plugs with the multiple ground straps (electrodes) just shroud the center of the plug too. I was always told that you need a high turbulence chamber for those to get the best air/fuel charge into the gap for the spark to get it. The example of the high turbulence they were talking about was turbochargers and superchargers.
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Unread 08-29-2011, 05:01 AM   #9
waterdowg
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Champion Truck Plugs
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Unread 08-29-2011, 06:07 AM   #10
twoleos617
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Ive tried the irridium, E3's, etc. all are crap in the 258. go copper as suggessted.
the high dollar E3's i use in my other cars and love them. ive had good luck with them in my 3.8 and 5.3 engines.
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Unread 08-29-2011, 06:11 AM   #11
Matt1981CJ7
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I asked for "Champion Truck Plugs" at Napa and at O'reilly's and was told they don't make them anymore.

Is this true?

Matt
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Unread 08-29-2011, 06:12 AM   #12
Ken4444
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Quote:
Originally Posted by Cutlass327 View Post
..So you have to change them every 30k, so be it....
For whatever reason, I have always found that changing spark plugs was somewhat theraputic. It gives you a chance to see what's going on inside the engine, it doesn't have to be done that often (assuming you don't drive 60,000 miles a year), it's cheap, doesn't take too long, doesn't require that you get under the vehicle, and on a Jeep (any many trucks and cars), the plugs are really easy to get to.
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Unread 08-29-2011, 09:14 AM   #13
Renegade82
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I wouldn't put Bosch spark plugs in anything. I have 2 friends who both had bosch plugs that broke and created major engine problems $$$. Even after a letter from the mechanic, and some pics, stating that the plugs were the cause; Bosch wouldn't pay a dime of the several hundred dollar repair bills. I refuse to buy any of Bosch's power tools also, or anything with their name on it for that matter.

I use 985's in mine, but have used Champion's in the past.
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Unread 08-29-2011, 09:24 AM   #14
esearscj7
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Autolite 985. My jeep did not like platinum AT ALL!
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Unread 08-29-2011, 09:33 AM   #15
waterdowg
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Just ask for Champion Cooper plugs should be plug number RFN14LY
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