Quote:
Originally Posted by Jamesp
Pumped down everything south of the vacuum check valve by connecting a vacuum source (the Extreme Super Smoker in reverse - turning out to be handy) to the check valve itself and pulling a vacuum. pulled the check valve off after about 30 seconds and there was plenty of vacuum. Checked the actuator for the butterfly valve in the resonance tube and it's tight. Can the air injection cut off valve have a constant leak that shows up in a smoke test??? I blew into the tube and that valve is closed at present. Can the butterfly valve stem have a leak?
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Yes to both questions.
Rather than pull a vacuum and then listen to see if any is left, you need to be testing with a unit that allows you to pull a known level of vacuum and watch for any changes:
Sometimes the vacuum leaks that cause these codes are slow but continuous ones.....