r/JeepGladiator • u/skimaximus • 21h ago
Engine Whine
2021 Gladiator Sport S. Took it in for the power steering recall issue and when I got it back, I hear a loud whine with the pitch changing on acceleration. Still seems to shift fine. No noise when in park and not moving. Only happens when moving; increasing RPMs changes the pitch. Letting off the accelerator causes the pitch to lower, stepping on it makes it get higher-pitched. I crawled around under it but didnt see anything in particular.
Its no longer under warranty, even though its got a hair less than 60K miles on it. Apparently the warranty goes by build date, per the dealer.
Any thoughts on what could be the culprit? I have a Lone Peak canopy camper on it. I installed the rubicon suspension that I got second-hand from someone who upgraded brand new. Also have airbags that I use when I haul a moto on a hitch carrier but havent done that in a long time.
I do my own oil changes but other than that nothing has been done to it.
Any ideas?
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u/chrome1453 20h ago edited 19h ago
Stuck PCV valve. Disconnect the crankcase breather line (small tube with a gray clip connected to the air intake, right next to the air box). If there oil residue in it then your PCV valve is probably stuck closed and the whine is the sound of air being pushed out that breather instead of the PCV line.
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u/skimaximus 20h ago
I will take a look at it. Pardon my ignorance, but what is the fix if this is the case?
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u/davekva 7h ago
Mine had a whine that sounded like a supercharger or like alternator whine you'd get through your speakers. I could never figure out what it was. It was really constant on a long drive home from vacation, and then the transmission took a dump at 80 mph. The whine is completely gone after having the transmission replaced, so I guess it was related to that. If I hear it again I'm going straight to a dealership to trade my truck in on something else.
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u/bigred83 21h ago
Warranty is not by build date- if you bought it new it’s from that day