Repeating P0440/46 Codes (Update, A slight problem) - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 09-30-2007, 05:04 PM   #1
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Default Repeating P0440/46 Codes (Update, A slight problem)

I'm getting a bit aggravated. (I now sympathize and understand how sandrock and other people feel)

This is like my 30 or 40th time (seriously) getting those codes.

So when it came back today, I used my new nifty codereader with some added abitlites (freeze-frame)

I got 2 P0440 (Evap Emission control malfunction) and I'm stumped why I keep getting it. I thought it was due to a faulty gas cap so I got a replacement gas cap.

The freeze data gave me a look at the vitals when the trouble code was triggered.

Throttle Position: 18.4%
RPM: 2062
Load Value: 20.7%
Air Flow Rate: 36.77 GR/sec
MAP Sensor: 82 KPA
Coolant Temp: 190* F
STFT: 6.2%
LTFT: -2.2%
STFT3: -68.8%
LTFT3: 38.2%
Fuel System: CLSD

I have no idea what all these means....anyone help?
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Old 09-30-2007, 09:57 PM   #2
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check the vacuum lines on the evap silonoid
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Old 10-01-2007, 09:19 AM   #3
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Coder...

Was the area where the cap seals rusty or corroded?
Have you checked your evap canister lines?

I would suggest we get you the diagnosis from the FSM and walk through the map for fixing this up.

Was there any work done right before this issue popped up the first time?
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Old 10-01-2007, 12:27 PM   #4
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Bill, I will check the cap.

I should add that every time I add gas, I get a tremendous release of pressure when I open the cap, is it a bad valve in the EVAP system?

( Edited by mod: Link discussing gas spewing: http://www.bonnevilleclub.com/forum/...954&highlight= )

The evap canister is where the FWI would have went, right? I don't have a FSM, just a Chilton'*.

The only work I can think of is the INTENSE PCM but that was done in the car and I had troubles with the codes way before the PCM got installed...
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Old 10-01-2007, 01:54 PM   #5
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There shouldn't be that release or vacuum when you pull the cap. I would start looking at the evap canister, the lines for kinks or pinching and the evap switch/purge on the front valvecover area.
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Old 10-01-2007, 02:27 PM   #6
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Like Bill said, you've just identified the pertinent symptom, being the evap recovery system. Now you just need to do the diagnostic review of all the lines, the cannister, and the purge solenoid. There'* good info on that in your FSM.
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Old 10-01-2007, 02:40 PM   #7
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Quote:
Originally Posted by lash
There'* good info on that in your FSM.
I don't have one btw.

I will go and check out the lines.
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Old 10-01-2007, 02:55 PM   #8
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Ahhh...missed that in you're earlier post, but remembered that Bill had referenced it, so assumed.....well you get the idea, lol.

Anyway, your evap/charcoal cannister is under your stock PCM and intake filter location. There'* a purge solenoid on top of it that can go bad, or your cannister may actually need to be replaced. Also, as Bill mentioned, an evap line can get clogged or kinked.

From a cost perspective, the first thing should be to evaluate the condition of all the evap lines that you can see, including those on the evap cannister.

If someone doesn't beat me to it, I'l look up the actual diagnostic steps in my FSM tonight.
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Old 10-01-2007, 09:00 PM   #9
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Ok, I did a quick visual inspection of the engine bay.

I didn't remove the PCM tray but I just looked at the connections. It seems fine and not kinked or pinched in any way. The EVAP solenoid on the top looked fine. However, I remembered that I accidentally broke the line from the FPR to the TB (the one closest to the TB, there'* two of them) but it seems stuck in far enough not to present any issues. I also checked the filler neck, there' no corrosion or whatsover but I cleaned it with a rag anyway.

Is the EVAP valve behind the wheelwell housing?
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Old 10-02-2007, 09:44 AM   #10
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Your evap valve is either on top of the canister or right in the middle of your front valve cover..slightly over it actually. One of those two lines that you mentioned goes to the valve.
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