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EVAP leak

Tiny
DHDANNY
  • MEMBER
  • 2003 DODGE CARAVAN
  • 3.3L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 196,000 MILES
EVAP codes P0455 P0442 leak detected. Replaced gas cap, replaced purge solenoid, smoke machine showed smoke at base of LDP fresh air filter. No other smoke noticed. Any advice would help. It was suggested I replace the EVAP vent valve but I cannot find this valve through any of the lines.

Thanks!
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Saturday, February 3rd, 2018 AT 1:11 PM

5 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Hello,

A vent valve should not cause a leak unless the hose going to it is off or has a hole in it. I would visually go over the system to see if you find any hoses that are cracked or have fallen off. If everything looks okay I would replace the charcoal canister.

Below is a guide to help you see how the system works.

Let us know what happens and please upload pictures or videos of the problem.

Cheers, Ken
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Monday, February 5th, 2018 AT 11:00 AM
Tiny
DHDANNY
  • MEMBER
  • 3 POSTS
Replaced canister, still get codes P0455 P0442. Checked all hoses and found nothing cracked or loose. Smoke machine shows smoke at the fresh air vent connected to the leak detection pump (LDP). I think this may be normal (or understandable) because it is a vent tube for the pump, but perhaps the port should be a kind of one-way valve? Air gets taken in but not let out to keep the system pressurized? I think I may have a bad pump then? Any advice would be helpful.

Thanks!
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Saturday, February 10th, 2018 AT 11:17 AM
Tiny
KEN L
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  • 47,643 POSTS
Smoke should not come out of the system at all it is closed. When you say leak detection pump I do not see it in the diagram above. Can you take a picture and upload it so I can see what you are talking about?
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Monday, February 12th, 2018 AT 9:33 AM
Tiny
DHDANNY
  • MEMBER
  • 3 POSTS
Smoke shows coming through the air filter connected to the pump. I believe #18 in your diagram (breather). #3 in my picture. I agree that the system should be closed.
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Monday, February 12th, 2018 AT 5:31 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Good find on the diagram I would say the pump is bad but I think I would try to get a used unit because they don't go out that often.
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Tuesday, February 13th, 2018 AT 10:11 AM

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