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99-04 Jeep Grand Cherokee Laredo Dark Headlights Clear Cor99-04 Jeep Grand Cherokee Laredo Chrome Headlights99-04 Jeep Grand Cherokee Laredo Dark Headlights

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Unread 08-15-2009, 11:30 AM   #1
skiebuster
Registered User
2004 WJ 
 
Join Date: Aug 2009
Location: Argos, Indiana
Posts: 140
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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Unread 08-15-2009, 06:19 PM   #2
ZeeJay1997
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1997 ZJ 
 
Join Date: Dec 2008
Location: Sweet Home, Alabama
Posts: 6,862
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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Unread 08-16-2009, 07:11 AM   #3
skiebuster
Registered User
2004 WJ 
 
Join Date: Aug 2009
Location: Argos, Indiana
Posts: 140
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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