Join Date: Jul 2007
Location: Where ever I'm at in the U.S.A. N. Indiana
Drives: Ford Escort '01, Kia RIO '03
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I don't recognize the code you furnished 90101 and doing a quick search could find nothing. However it sounds life a random misfire problem being caused by spark plugs that need replaced , be sure to gap the new plugs at .028 to .032, and I would suggest using a std plug by NGK, nothing fancy. Another check is checking the wiring going to the plugs, they are all bunched up together which has the tendency to cause cross firing is they get wet or older and loose some of their insulating properities.
If these do no fix/help the problem check out the coil pack but I would make that as a last resort.
#1 replace plugs with std. NGK plugs gaped at .o28 to .032
#2 check ignition wired, make sure they are completly dry and possibility spray with silicone spray. Lastly, replace with new ones, they really aren't that costly.
#3 check out the coil packs, this is a possibility but not likely.
I looked up your town and area under weather underground and I see no moisture in sight or have been, did you wash/spray off cleaning the engine?
Anyway this is a better start, thanks for the profile help and keep us posted, oh ya, how many miles on the RIO?
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