Anyone know how to troubleshoot an evap issue - IMBOC
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post #1 of 9 (permalink) Old 07-21-2019, 08:36 PM Thread Starter
 
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Anyone know how to troubleshoot an evap issue

Does anyone have any suggestions for how to troubleshoot an issue with the evap system? I get a CEL every now and then. Could boost be causing the issue?
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post #2 of 9 (permalink) Old 07-21-2019, 09:35 PM
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What's the code, and what mods have you done. If it's an 01 could be lots of things, evap. canister, bad hoses, gas cap seal, overfilling the tank etc.


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post #3 of 9 (permalink) Old 07-21-2019, 11:38 PM Thread Starter
 
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P0455 - the car is heavily modified. MMR 900 long block, turbo, 2004 cobra dual fuel pumps, 42lb injectors. I do not smell fuel. I believe the evap system works off vacuum, I thought maybe boost maybe causing the problem.
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post #4 of 9 (permalink) Old 07-22-2019, 12:14 AM
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That code indicates a big evap leak. Check all your hoses and connections. Unless you have big duration cams, vacumn should not be an issue. Probably a broken line or hose. We used to pump smoke through the system and see where it leaked out.


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post #5 of 9 (permalink) Old 07-22-2019, 05:22 PM

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I had the same issue the smoke test found it. I was a leak in the hose that ran besidethe rear axle by the passenger side good luck
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post #6 of 9 (permalink) Old 07-22-2019, 09:02 PM Thread Starter
 
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I have access to a smoke tester. Do I connect it to the service port?
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post #7 of 9 (permalink) Old 07-22-2019, 10:14 PM
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If there is a service port you can use that, or remove the fitting from the under hood canister and blow smoke into the fittings one at a time until you discover the leak. One fitting will end up smoking at the air intake for the air filter box, and the other will blow smoke to the back of the car, tank, filler neck etc. Good luck.


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post #8 of 9 (permalink) Old 07-22-2019, 11:46 PM Thread Starter
 
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Thank you for the help. I will try to test this weekend.
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post #9 of 9 (permalink) Old 07-23-2019, 01:35 PM

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Having a smoke tester is a big plus for your tool chest when diagnosing a problem like this. I wish I had one.
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