2001 Nissan Altima P0445 - EVAP Emission Leak (Large)

NISSANBEGINNER

MEMBER
2001 NISSAN ALTIMA
4 CYL
2WD
AUTOMATIC
70,100 MILES

Got my oil change done this Sunday at local chevron station for my 2001 Nissan Altima (I put valvoline oil). They told me that Fuel Injector needs to be injected and they did it (They injected some liquid. Chevron guy was holding a can from some distance away from car and a tube was connected to one of the pipes that ran very close to the side of the hood near the steering wheel – makes sense?). After that I put gasoline and drove for 50-75 miles on sunday and monday and monday evening, I saw "service engine soon" light on. I showed it to a mechanic on tuesday. He hooked up a machine to my car's computer and came up with a code P0445 - Evap engine emission leak (large). He tightened the gas cap, reset the computer and told me to wait for a day. Now there is no service engine soon light but I am a pretty much convinced that it is not gas cap. I smell fuel when I walk around my car and sometimes even when I am inside driving it with all windows rolled up. I drove around 25 miles so far and did not see the light come on.

Between, When the chevron guys did oil change and fuel injector change, the first time I started my car, I felt it did not start immediately and smoothly as soon as I turned on ignition. Also, the car wobbled a bit before stabilizing.

Pleaasseeeee help me out!

4 Replies

MASTERTECHTIM

MECHANIC
4,749 POSTS

It very well could have been the gas cap. As for your running problem, that is a side effect of having the fuel injection cleaned. It will return to normal in a couple of days. If the light stays off, dont worry about it. If it comes back on, the mechanic might have done injector cleaning through the vacuum line the evap purge solenoid is on and could have disrupted the line. He will probably take another look at it if it does come back on again. Check back with us. Feedback is much appreciated.

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Wednesday, January 16th, 2008 AT 9:15 PM

FISHERMAN

MECHANIC
938 POSTS

Hello !

Do not worry about it.

P0445 - Evap engine emission leak

Evaporative control system
The car is equipped with an evaporative control system, which prevents gasoline vapor from being released into the atmosphere.
The system consists of a fuel tank with filler pipe and cap, two rollover valves, a Fill Limit Vent Valve (FLVV), vapor vent lines, a charcoal canister, a purge line, and a purge control valve and engine connections. In addition, there is a pressure sensor connected to the fuel tank and a filter-protected Canister Close Valve (CCV) on the atmospheric side of the canister, for system diagnosis.
The gasoline vapor is channeled through the rollover valves and the FLVV via the vapor vent lines into the charcoal canister, where it is stored. When the engine is started, the gasoline vapor is drawn from the charcoal canister to the engine's air intake system and into the combustion process.
If any vent gas cap or vaccum hose its "open" the ECM receives a signal and stores a malfunction (check engine Light)

Yes. The gas cap could be the problem.

And about the fuel injectors cleaner thats the way to do it with out remove them.

Good Luck and best regards.

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Wednesday, January 16th, 2008 AT 9:22 PM

NISSANBEGINNER

MEMBER
3 POSTS

This is Amazing stuff.I was expecting reply only by weekend. Thanks for the fastest reply ever noticed by me. But one request. Could you please elaborate on "vacuum line the evap purge solenoid is on "

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Wednesday, January 16th, 2008 AT 9:23 PM

NISSANBEGINNER

MEMBER
3 POSTS

Hello !

Do not worry about it.

P0445 - Evap engine emission leak

Evaporative control system
The car is equipped with an evaporative control system, which prevents gasoline vapor from being released into the atmosphere.
The system consists of a fuel tank with filler pipe and cap, two rollover valves, a Fill Limit Vent Valve (FLVV), vapor vent lines, a charcoal canister, a purge line, and a purge control valve and engine connections. In addition, there is a pressure sensor connected to the fuel tank and a filter-protected Canister Close Valve (CCV) on the atmospheric side of the canister, for system diagnosis.
The gasoline vapor is channeled through the rollover valves and the FLVV via the vapor vent lines into the charcoal canister, where it is stored. When the engine is started, the gasoline vapor is drawn from the charcoal canister to the engine's air intake system and into the combustion process.
If any vent gas cap or vaccum hose its "open" the ECM receives a signal and stores a malfunction (check engine Light)

Yes. The gas cap could be the problem.

And about the fuel injectors cleaner thats the way to do it with out remove them.

Good Luck and best regards.[/Quote:31010d7bd8]

This is excellent stuff you guys! Amazing. You make the world the best place to live.I mean it

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Wednesday, January 16th, 2008 AT 9:26 PM