EVAP system 98 xj.

K

killer98xjsport

NAXJA Forum User

Location

Portland Oregon

• Mar 18, 2009

• #1

My xj is storing codes for a large evap system leak. Last night I smoke tested the whole system and found nothing. I think the purge valve may be stuck open. Anyone else have had to diag their xj for evap leaks? What did you find? Is the purge valve common failure?

 

W

winterbeater

NAXJA Forum User

Location

Royal Oak, Michigan

• Mar 18, 2009

• #2

Once your all warmed up, the valve should be clicking on and off 5-10 times per second. If not, you could check for signal from the PCM.

 

RichP

NAXJA Forum User

Location

Effort, Pa

• Mar 18, 2009

• #3

Check your gas cap, they do go bad.

 

K

killer98xjsport

NAXJA Forum User

Location

Portland Oregon

• Apr 21, 2009

• #4

So still trying to track down this leak p0455 being stored for large leak. I have replaced the gas cap as well as the purge valve. I smoke tested the system and could not find a leak. I had the though that maybe the leak detection pump is weak and is not building pressure or vaccum, don't know what jeep uses to test for leaks vac or pressure. So if the pump is weak it could think there is a leak? Anyone have other ideas??

 

blondejoncherokee

NAXJA Member

NAXJA Member

Location

sacramento

• Apr 21, 2009

• #5

did you check the second hose on the filler neck? mine for no reason had a hole in it and couldnt really see it during the smoke test.

 

K

killer98xjsport

NAXJA Forum User

Location

Portland Oregon

• Apr 21, 2009

• #6

I did check that area, did not see anything during the smoke test but will recheck.

 

Ivan

I Jeep, therefore, I am..

Location

Greensboro, Ga

• Apr 21, 2009

• #7

I would second checking the fuel tank filler neck area as well. My '98 had a evap leak the day I bought it new. After having the dealer throwing many parts at it, it was ultimately determined that the filler neck itself (where it attaches to the tank) had a crack in it.

A new fuel tank (under warranty) fixed that problem....

 

RichP

NAXJA Forum User

Location

Effort, Pa

• Apr 22, 2009

• #8

Ivan said:

I would second checking the fuel tank filler neck area as well. My '98 had a evap leak the day I bought it new. After having the dealer throwing many parts at it, it was ultimately determined that the filler neck itself (where it attaches to the tank) had a crack in it.

A new fuel tank (under warranty) fixed that problem....

Click to expand...

I also remember someone on here finding a vac leak on the hose coming out of either the neck or the tank that runs up front along the frame rail..

 

K

killer98xjsport

NAXJA Forum User

Location

Portland Oregon

• Apr 22, 2009

• #9

I think i am going to go ahead and replaced the filler neck and the hoses and see what happens. Thanks for the ideas.

 

2

2000xj

NAXJA Forum User

Location

Anoka,Mn

• Apr 22, 2009

• #10

Also check the small plastic tubes that run down the fire wall on drivers side. Straight back from about the manifold. There is a short hose that connects the two tubes together. This cracks and causes a code. Couldn't see my small crack in the hose till I took it off.

 

R

RD93Chry8.25

NAXJA Forum User

Location

Peoria, AZ

• Apr 22, 2009

• #11

I had this on my 01 accompanied by the code for small evap leak, and a new gas cap seems to have fixed it (so far!).

 

1

1968 Charger B5

NAXJA Forum User

Location

Orleans, Ma

• Sep 11, 2009

• #12

I'm having the same problem I changed the hose/line running from gas tank to container near axle, it did nothing. I'm changing the gas cap today, but I'll also look for those lines near the manifold, let you know what it was...