This morning on the way to work, the EGR was really making the engine run rough and bog down. It woudl nearly die at stop lights and buck when I gave it a little gas. But eventually it smoothed out and I went to work without much further fuss. On the way home, all seemed well until I got off the freeway, then it was pinging like crazy and the idle was high... like no EGR at all.
I already had run into trouble with the 5 port vacuum port switch not running the Thermac system properly. It was allowing vacuum to the heat/cold door on the air cleaner snorkel when the engine was hot, which made the engine ping like crazy. I moved it to another port that is not used on my car where vacuum is cut off at the same time vacuum is turned on to EGR. And now this!
I ordered a different brand of vacuum port switches (yes, both the 3 and 5 port switches) and hopefully this will solve the problem. Once that is resolved, I think I need to either put the original EGR valve back in the car or recalibrate the new one with a different metering disc. It seems to be a bit too heavy on the exhaust gas intro. That or the carb needs to be rebuilt. What a mess!
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