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Beer makes me pee
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Working on a car for a friend trying to get it inspected. It is a 2006 pacifica. Got the engine running right with new lifters and spark plugs. Then the p0420 code popped up. I have a autel scanner and it showed a bad converter, so I replaced that and the o2 sensors. Now showing missing gas cap. Replaced the cap but it is still showing the same code. I am looking for a diagram on how the vapor system works but cant find anything.

Help?
 

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Premium Member
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Hate to break the news to you but that era Pacifica was a problematic POS.
 

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Beer makes me pee
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Discussion Starter #3
Oh I know that. Lol Fix one thing and find 3 others. I just want it to pass inspection.
 

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SHERIFF
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Working on a car for a friend trying to get it inspected. It is a 2006 pacifica. Got the engine running right with new lifters and spark plugs. Then the p0420 code popped up. I have a autel scanner and it showed a bad converter, so I replaced that and the o2 sensors. Now showing missing gas cap. Replaced the cap but it is still showing the same code. I am looking for a diagram on how the vapor system works but cant find anything.

Help?



Whats the code? what motor?
 

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Registered
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1,556 Posts
Smoke test it. Could be anything from a bad purge solenoid to a bad LDP. Without smoke testing it, you are going to waste a fortune on possibly unneeded parts.
 

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Rippin' Gears!
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A co-worker has an '01 Dakota. Check rubber hoses. On his, I can't tell you how many times we've replaced
hoses on it. Under the battery box, down near the tank, etc. Rock Auto even had a couple of molded hoses
that we changed out.
 

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FE Ford Specialists
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If you own a Chrysler - you are a mechanic by default.
Repair opportunities are part of the ownership experience.
 

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Not a Chrysler tech (thank God lol), but the last Pacifica I had with an EVAP code and "gas cap" message ended up having a crack in the RH fuel pump, where the vapor line snapped in. Smoke test is your best method here. I believe that the PCM must run and pass the EVAP monitor before the "gas cap" message will actually go away. Clearing the codes sometimes won't make the message on the dash go away..
 

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Not a Chrysler tech (thank God lol), but the last Pacifica I had with an EVAP code and "gas cap" message ended up having a crack in the RH fuel pump, where the vapor line snapped in. Smoke test is your best method here. I believe that the PCM must run and pass the EVAP monitor before the "gas cap" message will actually go away. Clearing the codes sometimes won't make the message on the dash go away..
Exactly this, I had one where I was able to epoxy the line and get it to seal, car still comes in and the repair is holding, I did it at least 3 years ago.
But as stated, it could be anything, start with a smoke test if you can, if not try smelling around the tank and lines.
 

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Not a Chrysler tech (thank God lol), but the last Pacifica I had with an EVAP code and "gas cap" message ended up having a crack in the RH fuel pump, where the vapor line snapped in. Smoke test is your best method here. I believe that the PCM must run and pass the EVAP monitor before the "gas cap" message will actually go away. Clearing the codes sometimes won't make the message on the dash go away..
Very common on these turds, also check the evap lines around/underneath the battery IIRC. They were a big roomy car with a lot of nice luxury amenities, but a gutless gas hog that always had something just silly wrong with it-get rid of it and move on asap.
 

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Beer makes me pee
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Discussion Starter #15
Well I dont have a smoke tester. But I do have freon and a leak detector. Maybe that will work.
 

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Drag Week Survivor
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Well I dont have a smoke tester. But I do have freon and a leak detector. Maybe that will work.
Just start looking at the the hoses from the LDP pump. They liked to use rubber elbow that would form cracks.

If you have the correct scanner you can force the car to do an EVAP test to verify the results.

I'm thinking if the code is missing gas cap, then you have a pretty large evap leak.
 
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