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Shoutout to the old timer who showed me a trick with a zip tie and a vacuum line
Honestly, I was chasing a rough idle on a 2012 Civic for like two hours yesterday, checking all the usual stuff. Ngl, this retired mechanic at the parts counter said to use a zip tie to pinch the PCV hose shut for a second while it was running, and the idle smoothed right out, pointing straight to a bad valve. Has anyone else used that trick to find a vacuum leak fast?
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betty_white396mo ago
That's a solid trick. Did he say to replace the whole PCV valve or just the hose? Sometimes the hose gets brittle and cracks.
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linda_wood6mo ago
My old Civic taught me to check the grommet where the PCV valve sits into the valve cover. Honestly, betty_white39, that little rubber piece gets rock hard and leaks vacuum even if the hose and valve are new. Tbh I spent weeks chasing a rough idle before a mechanic showed me that. It's a five dollar part but nobody talks about it. You have to pull the valve out to even feel if the seal is any good.
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evab525mo ago
Wait, seriously? A five dollar rubber grommet can cause all that?
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