Quote:
Originally Posted by 4RSS FED
Just wanted to throw out this tidbit. My car has gotten a few "evap" codes over the past few months. I believe it was the P0442 code. Everything looked normal, so the first time it happened, I replaced the gas cap thinking that was the problem. Then it showed up again a month later. Cleared the code. Then it showed up again a couple of weeks ago. Then I had a light bulb moment. I believe it is coming from my manual exhaust valve switch. I usually don't move it and run open all the time, but I had moved it a few times for demonstrations before the code showed. I believe there is a vacuum leak at the switch (or from the switch to the exhaust) that the computer can detect. So I need to look at it but wanted to share the info in case anyone else has had the same issue.
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What kind of switch do you have that would contribute to a vacuum leak? Are you using a vacuum valve as the switch? If you are using an electric switch, then it merely is opening and closing the circuit that controls the vacuum solenoid valve. If you have the stock NPP exhaust, this should not contribute to a vacuum leak. But, if you do have a vacuum leak, check the vacuum line from the engine to the vacuum accumulator tank. Then check the vacuum accumulator tank itself. Lastly, the vacuum line from the engine to the accumulator tank should have a one-way check valve in-line with the tubing. This is prevent vacuum leaks downstream of the check valve. You may want to check that as well.
Steve