98 ZJ 4.0 codes - JeepForum.com
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post #1 of 4 Old 08-15-2009, 11:30 AM Thread Starter
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1999 XJ Cherokee 
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Location: Argos
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98 ZJ 4.0 codes

Wanted to ask...

In my 98 ZJ
I have 2 codes that are coming up every now and again...

PO442 Evap system small leak

PO455 Evap system large leak

where do I begin looking for leaks in the evap system ? How do i find them ?

skiebuster is offline  
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post #2 of 4 Old 08-15-2009, 06:19 PM
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1997 ZJ 
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There are some rubber splices in the line going back to the tank that rot after a while. One is under the washer fluid reservoir and another down underneath by the tranny, and one more on towards the tank.

Then there's the possibility of a bad gas cap.

If you have California emmisions, that's another story.

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post #3 of 4 Old 08-16-2009, 07:11 AM Thread Starter
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1999 XJ Cherokee 
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Thanks ZeeJay! I dont think its the gas cap. I will crawl underneath and check the lings going back and see if i can find any of the splices dry rotted.
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post #4 of 4 Old 12-01-2015, 04:36 PM
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1998 ZJ 
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Just posted the same response on another thread. Check the rubber boots at the ends of your evap lines coming from your canister. Check your vapor canister, fuel leak detection pump, and your solenoid for any cracks or anything to be unplugged. I was just dealing with a similar issue in my 98 zj.
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