egr solenoid
Hi,
Your solenoid must have been venting, or you would have a lousy, or no idle.I think they are closed when at rest. Do you have a vacuum signal to the valve at idle? Some GM egr valves are negative backpressure transduced, so they won't open when there isn't a backpressure signal from the exhaust. I don't think our turbo cars are in this category.
Try this: Ground a to b on the ALDL, key on engine off.Attach a hand vacuum pump to the source on the control unit, pump it up to 10", if possible.Disconnect the jumper on the ALDL, and observe the gauge on the pump. Any changes?
I don't have access to the flow chart for egr problems, many different configurations were used by GM, and I'm not sure what our cars use.Being away from my manual info,not certain here.I would guess that this system was design to fail without causing undue driveability issues. By the way, a diagnostic switch in incorporated into the control unit, and no EGR will turn on a light and set a code.
I remember when I first got my car going, I wanted to check the boost solenoid.A WOT snap with the key on, engine off would cycle the solenoid, just like the EECIV Fords do.I would expect that all outputs are cycled when doing this.Try it, then you won't have to mess with disconnecting and reconnecting the ALDL jumper. I can get you more specific info if needed, just not today. Let me know, drop me an email if you need it.