Repost in CORRECT forum *duh*: 98 STS Rough Idle driving me crazy!
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Joined: Mar 2012
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From: Seattle
Repost in CORRECT forum *duh*: 98 STS Rough Idle driving me crazy!
Sorry y'all...I'm new on the site & to be honest, it's a bit confusing to navigate. I'm reposting this here, as I posted it in a simple "Seville" forum. 
Bought my STS about a month ago (ok, maybe 5 weeks), and shes had a rough idle since I got her. I had a 100k mile service done at the dealership before I took her home (no charge, thank-you-very-much). I specifically told them to use Bosch Platinum plugs, and to make sure the gap was correct (because the first time you see the gap on the specs, you think it cant possibly be right...right?! HA HA!!). I thought new plugs would take care of the rough idle. Nope. So I took her home and took off the EGR valve & cleaned it (just a carbon dust build up, but it didnt seem to be sticking open). I'm a tad bit knowledgable about things under the hood, but not experienced by far! Was hoping y'all could throw some suggestions out there for me to try. Obviously, I'd like to start with the 'little' things that may fix the problem first. I'm an optimist at heart
Ps. No codes. Also, the rough idle is there all the time - whether she's cold or not, but it seems to diminish a little when she's warmed up.
Bought my STS about a month ago (ok, maybe 5 weeks), and shes had a rough idle since I got her. I had a 100k mile service done at the dealership before I took her home (no charge, thank-you-very-much). I specifically told them to use Bosch Platinum plugs, and to make sure the gap was correct (because the first time you see the gap on the specs, you think it cant possibly be right...right?! HA HA!!). I thought new plugs would take care of the rough idle. Nope. So I took her home and took off the EGR valve & cleaned it (just a carbon dust build up, but it didnt seem to be sticking open). I'm a tad bit knowledgable about things under the hood, but not experienced by far! Was hoping y'all could throw some suggestions out there for me to try. Obviously, I'd like to start with the 'little' things that may fix the problem first. I'm an optimist at heart
Ps. No codes. Also, the rough idle is there all the time - whether she's cold or not, but it seems to diminish a little when she's warmed up.
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