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Jeep Wrangler YJ
YJ General Discussion
Rough idle, pulled #4 spark plug no change?
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<blockquote data-quote="Gilaguy23" data-source="post: 435680" data-attributes="member: 19498"><p>For whatever reason most guys who drop in high dollar plugs with the hopes of better mileage or?? find soon after CEL and bad running/economy. Seems Bosch heat ranges are out of wack or something, I also say this first hand after installing them in a 4x4 suburban and a then new Jeep XJ. Mileage and performance when to shit. Its pretty common at the TJ forum to find a few posts a week regarding this issue. Best fix is to install basic Champion OEM style plugs. if your bored google "why dont bosch plugs work in jeeps" lost of reads on the subject.</p></blockquote><p></p>
[QUOTE="Gilaguy23, post: 435680, member: 19498"] For whatever reason most guys who drop in high dollar plugs with the hopes of better mileage or?? find soon after CEL and bad running/economy. Seems Bosch heat ranges are out of wack or something, I also say this first hand after installing them in a 4x4 suburban and a then new Jeep XJ. Mileage and performance when to shit. Its pretty common at the TJ forum to find a few posts a week regarding this issue. Best fix is to install basic Champion OEM style plugs. if your bored google "why dont bosch plugs work in jeeps" lost of reads on the subject. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Rough idle, pulled #4 spark plug no change?
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