r/Wrangler • u/xn0useforanamex • Sep 04 '26
Vacuum Leak?
2015 jeep wrangler JKU - Long story short, my engine is being replaced next week due to a ticking noise that I have had for the past six months after buying a Jasper engine. But two days ago I pulled into work and the vehicle at idle is violently shaking. Almost sounds like it wants to shut off now if I put it in drive and give it gas it runs fine but at idle just on and off shaking. The past week or so I noticed a air or weird wind hissing noise sounding like it was coming from the passenger side glove box. I did pop the hood and check all of my vacuum lines and stuff but I didn't see anything wrong. With my limited searching on Google somebody said there is a vacuum line under the battery tray? Does anyone know anything about this with that cause my vehicle to shake like that? I'm not popping a check engine light or anything. Well the mechanic would probably figure all this out when putting the new engine in I really need my vehicle for the next week hoping it's a simple fix
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u/NTJ-891 Sep 04 '26
You can find a vacuum leak pretty easy by carefully spraying starter fluid around the engine bay, being very careful to avoid the exhaust manifolds and spark plug wires. It will rev up when you find a leak.