I'm getting a p0455 (EVAP large leak) Replaced the gas cap & still get the same on 2003 Dodge Caravan

used a MAC smoke injector and can't find leak. replaced hoses and still getting code up to two weeks after I clear code

by in Algonac, MI on July 17, 2012
3 answers 2 comments
ANSWER by on July 18, 2012
code be intake leak or other issues. what is fuel trim readings telling you? if its lean it could be intake leak which u might not see with smoke test
ANSWER by on July 18, 2012
Could be electrical control issue with purge solenoid or cvs valve. Being able to read live data would be a plus in diagnosing. How long (miles , drive cycles) does it take for the code to return? Dealer might be best bet for proper evap system diagnosis.
COMMENT by on July 18, 2012
I have a MAC ET99 code checker and I can watch live data, but the problem is so intremittent I can't catch it. I pumped the intake manafold full of smoke and nothing showed up. Seems like a purge solenoid would kick a P0441 or a P0443. I was 100 yesterday and near that today so I'm going to crawl under it again tomorrow and check if I missed something.
COMMENT by on July 19, 2012
The 'intermittent' part is what annoys all of us with these type of problems!! Good luck.
ANSWER by on November 04, 2012
hi, i had i friend that has the same car and there was a cracked hose by the air cleaner also he had pinholes in the filler pipe it is hard to see i had a least three fords that had this problem

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