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Old 07-11-2009, 07:51 PM   #1
Join Date: Feb 2007
Location: Boulder, CO
Posts: 141
High Pressured Blow Off Sound and Oil?

High Pressured Blow Off Sound and Oil?

After driving around in the mountains for a few hours I came to the intersection of a major road. Upon waiting for traffic, I gave the jeep gas for a normal take off. I immediately heard a sound that was similar to a High Pressure Blow Off valve that seemed to come from the driver’s side. It only lasted for a seconds. I may have just been paranoid, but it seemed to have some overall vibration coming through the seat. Even my wife thought so, but the steering wheel was completely vibration free. Since it seemed normal enough I drove the remaining 5 miles home. Once home I walked around the jeep and did not see anything. However, once I crawled under the jeep I noticed a viscous liquid on the Driver side motor mount. It was coating most of the motor mount and really nothing else I could see. The liquid is similar to brake fluid, but not quite, and not quite motor oil. If I had to lean one way or another I’d say brake fluid.

There was no liquid on the engine block itself and I could not find any liquid on the Power Steering or brake lines? This is basically right under the air intake.

I checked the fluids in everything and it seems within specs and had not moved since the last time I checked. At this point I am at a total loss, but am worried something major is in the works.

Any thoughts will be appreciated.

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Old 07-11-2009, 07:55 PM   #2

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guessing but: axle vent tube not on all the way. Power steering line same thing.

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Old 07-11-2009, 09:02 PM   #3
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high pressure power steering hose? Any leaks?
99 sahara
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 07-11-2009, 11:02 PM   #4
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Location: Boulder, CO
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Not that I can find. From some other forums they are saying it might be my A/C which happened to be on at the time.
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Old 07-12-2009, 01:29 AM   #5
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it might be the front axle vent tube
1977 Cherokee ChiefEdelbrock 1406, 33X12.50, front 1.5 inch shackle lift. AMC 360, th400 Quadra-Trac
2002 wrangler, stock 4.0, auto, 33X12.50 maxis buckshot, AEV Highline Body kit, Ford 9 inch rear end.
Soon to come mods: 4" full traction lift, 4.56 gears, 35X10.50R15 boggers, 35X12.50 cooper st tires, spooled rear end, and much more.
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Old 07-12-2009, 10:37 PM   #6
Join Date: Feb 2007
Location: Boulder, CO
Posts: 141
From some other forums it seems to be my AC high pressure relief valve. Now to figure out what caused the pressure to spike enough to blow the valve.

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