rough idle and suddenly rich
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From: pleasanton ca
rough idle and suddenly rich ok so i went to the track yesterday and everything was fine... today when i went to drive it it was fine until about 5-10 min of driving then it started idling lower than normal and was pretty rough... the a/f is also much richer than it usually is. seems to feel fine when driving but its hard to tell... there is a small amount of smoke (kinda bluish coming out of exhaust) any ideas... does it sound like a spark/ ignition problem? any help is appreciated
thanks, Gary
thanks, Gary
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From: Macungie PA
Ya, it could be o2's. o2's and race gas don't mix. Usually they don't foul out just after one time of race gas. As for the blueish smoke thats interesting. blue smoke usually means worn vavle guides and piston rings.
Last edited by sunsetorang01TA; Apr 17, 2009 at 12:14 AM.
On The Tree
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From: Macungie PA
Ya i unplugged mine when they went bad. Drive around alittle and see how the car re-acts. by the way Denso o2's are alittle better i hear for race gas. I ordered some today actually. Been driving around with unplugged o2's in open loop for two years now. Time to give the denso's a try 
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From: pleasanton ca
could a bad plug wire be a culprit.. making it run on only 7 cylinders.. wouldn't that shove a bit of extra unburnt fuel through making the a/f ratio look rich and it would obviously run rougher...
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Verdad Gallardo On The Tree
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From: Macungie PA
oh yeah lol. sometimes plug wires can be a real pain in the ***. I've had plenty of plug wire issues where they slip off and God knows what else. There similar symptoms that you have. Along with back firing and popping from the exhaust. Hope the best for you though buddy!
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From: pleasanton ca
oh yeah lol. sometimes plug wires can be a real pain in the ***. I've had plenty of plug wire issues where they slip off and God knows what else. There similar symptoms that you have. Along with back firing and popping from the exhaust. Hope the best for you though buddy!
thanks im hoping this is what it is and since its in an s10 its fairly tight... i need to take out the inner fenders so i can get to the #7 and 8
Are you running an open loop sd tune or closed loop? If open loop, your o2 sensors are not functioning anyways, so this will do nothing. Maybe you fouled a plug with the race fuel or something weird. Check the pcv system too. Maybe if you are running open loop your IAT sensor took a dump and is tricking the computer for airmass calculations.
