The Northstar in my 94 Seville (175k miles) has been almost flawless over the last 100k miles. There'd been no sign of any problem before starting her up last night. She immediately began missing randomly on all cylinders; reminding me of a vacuum leak in a carburated engine. As I forged home, she continued missing and idling very rough. I had to keep my foot on the gas to keep her running at idle. A handfull of times the idle surged up to 2500 (without my help), afterwhich she'd run good for 15-20 seconds. Part way home the dash LED display displayed, "Traction Control Disabled". The missing and roughness got worse the more I drove. By the time I got her home, it was difficult to keep her running.
This morning I started her up (problem persists) and got the following CURRENT codes out of her: P023 and A047. From the list of codes on this site, my P023 code looks interesting. The description of that code on this web site says, "Electronic Spark Timing (EST) Signal problem [EGR]".
After lunch I'm going out to look for vacuum leaks. Any ideas or input would be greatly appreciated.
This morning I started her up (problem persists) and got the following CURRENT codes out of her: P023 and A047. From the list of codes on this site, my P023 code looks interesting. The description of that code on this web site says, "Electronic Spark Timing (EST) Signal problem [EGR]".
After lunch I'm going out to look for vacuum leaks. Any ideas or input would be greatly appreciated.