Engine Performance problem
1996 Saturn SL2 4 cyl Front Wheel Drive Automatic 260, 00 miles
car has 260,000 miles on it mostly hwy. Check engine light has been on for a while with two codes for EGR valve and Cat. Conv. Code. But was running fine and getting 30 mpg all the time. Yesterday my husband let the gas tank get a little emptier than I would and filled the tank. It was still fine until later while on the hwy the check engine light started flashing, as getting off hwy it was running realy choppy at lower speeds, fine at hwy speed of 70mph. Took to autoz and had same two codes plus a misfire on #3. At home checked plugs #3 was a little black others all white. Cleaned it also replaced EGR valve, undid battery cables for 1/2 hr like ins. Said to do and tried it again, it was worse. Tried carb cleaner and put in gas treatment but tank is already full, we will replace plugs and wires tonite, do you have any suggestions.
Friday, August 27th, 2010 AT 9:08 AM