Hello, new owner of an 86 GT and am having issues passing CA emission (high HC, everything else passes no problem), I have tested the egr valve (tested good, holds vacuum and passages are clear), I have solid vacuum (15-18 to the solenoid with no leaks) but when I raise the rpm to activate the egr valve, I can see the diaphragm move then quickly go back down, when I measure vacuum from the (new) solenoid as I raise and hold the rpm (1500 rpm range, not WOT) the vacuum jumps to 2 or so then immediately goes back to 0.
Shouldn't the vacuum hold steady from the solenoid while maintaining part throttle, cruising rpm? The only code I am getting from my scanner is a 31 which point to the EGR position sensor (have a new one on order), would that cause the solenoid to not maintain the vacuum at cruising rpm? Any help or ideas are appreciated.
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