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- April 25, 2000
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- 15,941
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- City, State
- Houston, Texas
- Year, Model & Trim Level
- 2008 JK
Hey all, maybe you can help me with a problem (and yes I've used the search function and read a whole bunch of posts).
At idle RPMs (~700) or more specifically, idle vacuum levels (~18-20 psi), there is a very loud drone coming from the engine. If you were on Top of the World with me at Moab you might have heard it. It used to only happen intermittently, but now it happens all the time. Basically whenever the engine is at around 18 psi of vacuum you hear this noise. This can be at idle or while coasting down the road at idle RPM. The noise is a very loud drone, almost like an airhorn. Other drivers look at me very funny and at lights I tend to double foot it a bit to keep the RPMs above 1000 and thus the vacuum around 10 psi. Gotta love my vacuum/boost gauge!
I cleaned the IAC and now my idle fluctuates from 1000 to 500 and back, about every 10 seconds it dips. If I unplug the IAC when the engine is on, the truck dies. Does this mean the IAC is bad or good?
I don't think its a vacuum leak b/c my vacuum stays steady at idle (700) and adjusts accordingly to engine load and speed.
Could it be another component?
Thank you for your help, my eardrums appreciate it!
At idle RPMs (~700) or more specifically, idle vacuum levels (~18-20 psi), there is a very loud drone coming from the engine. If you were on Top of the World with me at Moab you might have heard it. It used to only happen intermittently, but now it happens all the time. Basically whenever the engine is at around 18 psi of vacuum you hear this noise. This can be at idle or while coasting down the road at idle RPM. The noise is a very loud drone, almost like an airhorn. Other drivers look at me very funny and at lights I tend to double foot it a bit to keep the RPMs above 1000 and thus the vacuum around 10 psi. Gotta love my vacuum/boost gauge!
I cleaned the IAC and now my idle fluctuates from 1000 to 500 and back, about every 10 seconds it dips. If I unplug the IAC when the engine is on, the truck dies. Does this mean the IAC is bad or good?
I don't think its a vacuum leak b/c my vacuum stays steady at idle (700) and adjusts accordingly to engine load and speed.
Could it be another component?
Thank you for your help, my eardrums appreciate it!