98 ZJ 4.0 codes - JeepForum.com

 
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post #1 of 4 Old 08-15-2009, 10:30 AM Thread Starter
skiebuster
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1999 XJ Cherokee 
 
Join Date: Aug 2009
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 ?

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post #2 of 4 Old 08-15-2009, 05:19 PM
ZeeJay1997
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1997 ZJ 
 
Join Date: Dec 2008
Posts: 8,710
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, 06:11 AM Thread Starter
skiebuster
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1999 XJ Cherokee 
 
Join Date: Aug 2009
Location: Argos
Posts: 181
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, 03:36 PM
ayogeo
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1998 ZJ 
 
Join Date: Jan 2015
Location: Bucks County
Posts: 14
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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