2004 grand cherokee larado 4.0 i6 4x2 rough Idol
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Model: Cherokee
2004 grand cherokee larado 4.0 i6 4x2 rough Idol
Got this jeep 3 weeks ago, never owned one, its it excellent condition in and out - 78k miles - The idol seems to be a little rough, not terrible. I changed the plugs, it had Bosch +4 platinum in it, they didnt look to bad but replaced with the same, no difference. I read that these 4.0 dont like Bosch +4 - I cleaned the throttle body and idol sensor, that made a bit of difference. SO I decided to put in champion copper like many have recommended. The idol was worse and had a miss. I doubt its a plug issue, maybe the coil? sensors? If anyone has any suggestions as to what I can try to troubleshoot it or replace let me know, this engine should be purring with the champions in it.
#2
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What did the spark plug insulators look like? If they are dried out or cracked, carbon trailed or the contact springs are not good, you could have a miss.
I just bought a Denso set from rockauto.com for $18.32 shipping included. They are not available from Mopar unless you buy the coil pack, $279!
I just bought a Denso set from rockauto.com for $18.32 shipping included. They are not available from Mopar unless you buy the coil pack, $279!
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The plugs were new. I replaced the plugs that were in it with the same ones at 1st, the bosch +4, then I tried the champion copper because many said the 4.0 like copper and not the bosch +4's The bosch have a minor rough idle but the new champions had a worse idle and what appeared to me as a miss so I put the new bosch back in.
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