Quote:
Originally Posted by bishopts
Once you install your bosch plugs you should have a few days of the engine running pretty much like it does now. Then you should start seeing random misfires developing under a load. That will be the bosch plugs. They really only work in engines from Europe. So before you start pulling your hair out on why is it worse. Just order plugs that actually work with American GM engines. AC delco that have "japan" printed in the collar are ngk plugs. They work pretty good. Or just buy ngk plugs. I think you need to change the heat range for e85 but I'm not sure on that one. Factory gap isnt as critical as you think. You can easily gap plugs to the spec you need, just make sure all of them are the same gap.
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Do you have a recommendation for a good spark plug part number? I've seen the NGK 4344 Iridium IX, but its gap is 0.044", and I'm not comfortable adjusting it. That's why I chose Bosch. I've also seen a few forum posts where people are running them without issues.
Do you really think plugs could cause sputters tho..? I mean I changed them cause it says to change them at 60k mile and I'm at 58K..