How to Find a Small EVAP Leak p0442 "No Leaks"

[@FlatRateMechanic]

The smoke machine I use for EVAP testing amzn.to/43TKIlZ

[@KevinJohn-zy2rm]

How do you cap off the system without a scan tool?

[@YaBoiPoopStink]

pen cap

[@frankie53250]

Use a power probe to send power to the vent valve solenoid to seal the system

[@bbhoustontx]

@@frankie53250 ?

[@Rightroofer1]

Hey man. I have a 2023 Chevy express 3500 with 4000 kms on it. I was having some issues which seemed exactly like Transmission issues. As time progressed, i got a check engine light that was p0422. I brought it into the dealership and they located a leak at a solenoid which he said that they installed a clamp. Worked great for a bit. No more power issues. Stepped on the gas and there was no clunks, hiccups or lapses in power but now its got worse. Issue is, theres no check engine light so the dealership says theres nothing they can do. I m feeling the exact same things as before but it definitely seems worst. Any idea what it could be? Please help! Thanks. Frank.

[@crystalsnow9752]

Hi I'm buying your suggested smoke machine to test leaks though $70 for smoke is expensive😮 Anyways got a PO442 on 2015 eco malibu that runs perfect. You didn't find smoke so is that what means it needs a part? And how did you get a new error code? I have a code reader but onstar sent diagnosis then suddenly the engine light came on 😮. The canister purge valve is on top of engine on malibu I'm told so where else do I cap off smoke so I can check leaks?😢 if nowhere else and I don't see leaks do I replace purge valve first cause I brought a new gas cap already. I need to know how you got deeper than the po442 code 🤔 please help me. And please explain why I have to buy the $103 pressure gadget? I'm trying to do this as inexpensive as possible never knowing if this will be used again. Will the code reader and smoke machine suffice?

[@joeynunnink5594]

You can make your own smoke machine or even just get some rubber hose about 1/2" and a cheap cigar works