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2001 Chevy s10 with 2.2 motor code po400 have replaced

Customer Question
purge,vent,canister and fuel tank pressure...
2001 Chevy s10 with 2.2 motor code po400 have replaced purge,vent,canister and fuel tank pressure sensor and code still comes back.. If I command purge solonoid on smoke comes out air filter any ideas?
Submitted: 3 months ago.Category: Chevy
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Customer reply replied 3 months ago
with purge solonoid off smoke does not flow thru system
Answered in 31 minutes by:
4/3/2018
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 3 months ago
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 30,405
Experience: GM Grand Master Technician 2007. 14 years experience.
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Hello there, I am Cam.

I am Licensed technician at a GM dealership with more than 16 years experience. 
Like you, I am a user of this website and as such, any billing questions should be sent to customer service.

I ask that you please provide details and communicate with me so we can make your experience here worth 5 stars! I am around most days but not every minute of every day. If you reply while I am offline, I will respond when I am next online. 

I am reviewing your request and will post in a moment.

P0400 is an EGR related code, not EVAP emissions. For this you need to check your EGR valve operation and make sure the system is not plugged up by taking off the valve and visually checking the ports.

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Customer reply replied 3 months ago
Sorry I put in wrong code it is a po440
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 3 months ago

That is a system performance. Smoke test may be hard to find it. IF even the vent valve is leaking slightly, it would cause this, bad gas cap, corrosion preventing a solid seal at the cap, small rock hole or crack in the system. Its a very small leak.

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Customer reply replied 3 months ago
We found the evap line going the the tank was clogged. A code of p0442 keeps coming back. The vent, charcoal canister, gas cap. And tank pressure sensor have all been replaced with no results. The purge seems to be working fine. When smoking it it's only coming out of the vent. And when I use the scanner to close the vent it comes out of the gas cap. But as I said the cap is new and the mating surfaces are clean and not corroded. Any ideas?
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 3 months ago

Ok, then your new cap is bad. If it comes out then its likely a vented cap when it needs to be unvented.

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Customer reply replied 3 months ago
I got cap from AC Delco store...can u tell me difference between vented and unvented...I think I know but not sure
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 3 months ago

These caps are not supposed to allow anything out. Used for gas vehicle. Vented are only used for diesels that don't have evaporative emissions.

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Customer reply replied 3 months ago
cap is deffinately correct...is it possibly a fuel pump have u ever seen that before
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 3 months ago

Only if the top of the fuel pump is leaking. For now, if you have smoke coming out of the cap, that must stop or it will never clear the code

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Customer reply replied 3 months ago
With the vent closed where else could smoke go
Customer reply replied 3 months ago
Seems like it would have to push the pressure out somewhere
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 3 months ago

How much pressure are you putting into it?

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Customer reply replied 3 months ago
Just the smoke machine pressure
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 3 months ago

Then that pressure will build and hold in a properly operating system. You are talking about a couple psi at most. If it releases that pressure then it has no hope of holding vapour pressure.

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