the carburettor is making a howling sound when the trottle is opened wide. any idea what that is? important?
I was dignosing the EGR system, looking at a vacuum guage on the hose at the top of the valve, feeling for movement in the diaphram, etc. with the engine idling and opening the throttle to generate some vacuum. was not sure where the sudden high pitched howling sound was coming from until I removed the air cleaner. shutting off the engine gets rid of it until the throttle is opened wide again. spraying carb cleaner in the carb had no effect. have not tried this on a road test yet.
(BTW EGR problem seems to be in the solenoid. Opening throttle wide enough creates sufficient vacuum (16 in) to open valve but should open sooner (2300 RPM) according to the do-it-yourself book I'm looking at. valve itself seems to operate smoothly enough when pushed up manually. it was sticking a bit until I sprayed carb cleaner on the stem and let it sit overnight.)
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