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  #1  
Old March 14th, 2018, 23:23
bradleyheathhays bradleyheathhays is offline
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What this thing that's clicking under my hood?

96 XJ..





The sounds coming from this thing right in front of the pass firewall. It clicking 2-3 times a second loud enough you can hear it w/ the hood closed. It's done this a couple times before but I never tracked down the sound. No clue what it is.
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Old March 14th, 2018, 23:36
bradleyheathhays bradleyheathhays is offline
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Re: What this thing that's clicking under my hood?

Sorry don't know why the picture is so big.

The sounds coming from a part right in front of my pass firewall. It's a short vertical cylinder w/ 2 vac lines on the bottom and an electric connection at the top. Its clicking 2-3 times a second, loud enough you can hear it w/ the hood closed. It's done this a couple times before but I never tracked down the sound. No clue what it is.
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Old March 15th, 2018, 06:48
Green Mesa XJ's Avatar
Green Mesa XJ Green Mesa XJ is offline
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What this thing that's clicking under my hood?

Iíve heard it called fuel purge solenoid, looking it up itís called Duty Cycle EVAP Canister Purge Solenoid

Seem like they are supposed to tick.
Is it throwing any codes?


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Old March 15th, 2018, 07:30
JeepNoob JeepNoob is offline
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Re: What this thing that's clicking under my hood?

Quote:
Originally Posted by Green Mesa XJ View Post
Iíve heard it called fuel purge solenoid, looking it up itís called Duty Cycle EVAP Canister Purge Solenoid

Seem like they are supposed to tick.
Is it throwing any codes?


Sent from my iPhone using Tapatalk
It is and they are. It opens and closes to allow fuel vapors, if I remember right, from the charcoal canister, into the intake manifold under certain operating conditions.
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Old March 18th, 2018, 11:20
2X_01_Jeeps 2X_01_Jeeps is offline
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Re: What this thing that's clicking under my hood?

Faint tick-tick-tick-tick sound?

On my 2001 jeeps that would be a very small pump that is pumping air into the emissions system and the gas tank to test the integrity of the system.

Only runs when the gas level is somewhere less than Full and only runs for a little while after startup. If the test fails 3 (I think) times it throws a code.
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Old March 18th, 2018, 15:29
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sinat01 sinat01 is offline
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Re: What this thing that's clicking under my hood?

it will throw a code for EVAP leak usually if it fails, but it is a leak detection pump. if I remember right it pressurizes the fuel tank to like 1/4PSI to check for leaks
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