I have had a few cars in recently that have me puzzelled when it comes to Evap repair. Maybe you guys have some tips or pointers or can at least tell me what I am doing wrong.
First vehicale was I believe an 02 Dodge Caravan. Around 69k. A visual cheak revelled some broken ruber vacum hoses in the engine bay. after that was repaired. ran test again and it failed. Smoke check reveled the leak was coming from what I believe its called the bypass valve next to the canister. Its a round valve next to the canister just under the driverside floor board. Its very common. Sorry going from memory here.
After replaceing the part then clearing the codes and running the test on the scan tool it showed the same code for the leak. I smoked it prior to the re-test to verify no other leaks in the system and the other componets seem to be working properly individually but I just could not figure it out. FWIW it was the middle of the day and about 75*
The next vehical was an 04 Acura MDX. Around 71k This one had a 1456 code. It was 95* so I cleared the codes and ran the test. It passed but I figured the problem was still there so I waited till the next mornig when it was around 70*. Ran the test again and it failed... decided to tightened gas cap. failed again. Smoke check system and there was an issue with the two way valve next to the canister. So I replaced that and the solinoid attached to it incase it was not sealing properly. Smoked again no leakes. Clear and reset computer. Run the test and same thing, it failed again... This one I had no time to individually verify every other component was sealing properly but there were no obvious leaks.
What else should I be looking for??? or maybe some one has some insight as to why I get a fail after replaceing parts and re-runinng the test??? I want to rule out user error and learn something If I am makeing a mistake.
First vehicale was I believe an 02 Dodge Caravan. Around 69k. A visual cheak revelled some broken ruber vacum hoses in the engine bay. after that was repaired. ran test again and it failed. Smoke check reveled the leak was coming from what I believe its called the bypass valve next to the canister. Its a round valve next to the canister just under the driverside floor board. Its very common. Sorry going from memory here.
After replaceing the part then clearing the codes and running the test on the scan tool it showed the same code for the leak. I smoked it prior to the re-test to verify no other leaks in the system and the other componets seem to be working properly individually but I just could not figure it out. FWIW it was the middle of the day and about 75*
The next vehical was an 04 Acura MDX. Around 71k This one had a 1456 code. It was 95* so I cleared the codes and ran the test. It passed but I figured the problem was still there so I waited till the next mornig when it was around 70*. Ran the test again and it failed... decided to tightened gas cap. failed again. Smoke check system and there was an issue with the two way valve next to the canister. So I replaced that and the solinoid attached to it incase it was not sealing properly. Smoked again no leakes. Clear and reset computer. Run the test and same thing, it failed again... This one I had no time to individually verify every other component was sealing properly but there were no obvious leaks.
What else should I be looking for??? or maybe some one has some insight as to why I get a fail after replaceing parts and re-runinng the test??? I want to rule out user error and learn something If I am makeing a mistake.
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