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Old 05-09-2014, 12:42 AM   #1
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Default Intermittent EGR code

I have an '89 Skylark, 2.5l with 193K on it and I am having the check engine light come on and go off it seems after periods of idling for awhile. I think the OBDI code was 21 or 23 (EGR recirculation error, I believe). The EGR valve has been replaced and is vacuum controlled by a line going from it back to the rear of the throttle body. I made sure I got the right one since some are controlled by negative pressures and some by positive. Anyone have any ideas? Thanks.
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