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P0440 and exhaust leak

 
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BlackVenom
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PostPosted: Mon Jul 29, 2013 6:04 pm    Post subject:  P0440 and exhaust leak Reply with quote

I've had what sounds like an exhaust leak which appears to be coming from around the catalytic converter - which has been replaced 3-4 years ago (bad weld?) for a week or so now and the other day a CEL came on. Came up as P0440, evaporation system. Are the two connected?
The gas cap has been replaced before so I'm doubting it's that... may run up to a u pull it and replace it anyhow. Any ideas or how can I trouble shoot it?

Thanks for any help!

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Pitch Black SS
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PostPosted: Tue Jul 30, 2013 10:20 am    Post subject:   Reply with quote

first off, why go to a junk yard for a gas cap? They are cheap parts new and are known to have issues (on nearly every car)

As for the exhaust leak, need to get the car up in the air and have it running while you look for leaks

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2007SSImpala
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PostPosted: Tue Jul 30, 2013 10:05 pm    Post subject:   Reply with quote

I stuff a rag in the exhaust pipe and listen for the leak. If its really bad you should locate it quickly. You'll be able to feel the air coming out. There are a lot of parts in an EVAP system. could be a vent solenoid or the gas cap or a canister. Even kinked evap lines or broken evap lines. need to have the system smoke tested while all sealing components are sealed. I have seen bad fuel tank pressure sensors set this code. They send the amount of vacuum level reading to the ECM. If the ECM sees a consistent drop in vacuum or sees no vacuum building in the evap system. P0440 will set. Do the easiest first, make sure your gas cap is on correctly. Update us....

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BlackVenom
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PostPosted: Wed Jul 31, 2013 10:23 am    Post subject:   Reply with quote

Pitch Black SS wrote:
first off, why go to a junk yard for a gas cap? They are cheap parts new and are known to have issues (on nearly every car)

As for the exhaust leak, need to get the car up in the air and have it running while you look for leaks

I have a few other things to get while I'm there; not planning to go just for that. : )
If it ever stops raining I'll go out and do just that.
Also found this and I may give it a try... http://www.3800pro.com/forum/d.....p0440.html
haven't noticed anything "wrong" with the car other than that cel and that it's a bit louder around where the cat is.

2007SSImpala wrote:
I stuff a rag in the exhaust pipe and listen for the leak. If its really bad you should locate it quickly. You'll be able to feel the air coming out. There are a lot of parts in an EVAP system. could be a vent solenoid or the gas cap or a canister. Even kinked evap lines or broken evap lines. need to have the system smoke tested while all sealing components are sealed. I have seen bad fuel tank pressure sensors set this code. They send the amount of vacuum level reading to the ECM. If the ECM sees a consistent drop in vacuum or sees no vacuum building in the evap system. P0440 will set. Do the easiest first, make sure your gas cap is on correctly. Update us....

Will do. If not today, by this weekend.

Thanks PBSS & 2007SS

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Pitch Black SS
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1982 Chevrolet Malibu
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PostPosted: Wed Jul 31, 2013 11:29 am    Post subject:   Reply with quote

my point was, dont buy a used cap. Buy new so you can rule it out. Buying a used one that may have a problem wont help you any

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BlackVenom
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PostPosted: Sun Aug 18, 2013 10:50 pm    Post subject:   Reply with quote

Thanks for the help! Sorry for late reply. I don't know what I was thinking but the leak is at the resonator... I have yet to lay eyes on the leak itself but I'm assuming rust and assuming the shroud that fell off was connected to the res it probably originated there. Oh well.. it's louder now so it must be faster : )
The code was the damn fuel cap... for the 2nd time. Rolling Eyes

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gwb1968
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PostPosted: Mon Aug 19, 2013 11:02 am    Post subject:   Reply with quote

It probably is the resonator if it's still the original. they have a seam in them and are prone to rusting. Just had the one on my 04 replaced last week.
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lostwrench
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PostPosted: Mon Aug 19, 2013 9:38 pm    Post subject:   Reply with quote

gwb1968 wrote:
It probably is the resonator if it's still the original. they have a seam in them and are prone to rusting. Just had the one on my 04 replaced last week.

The resonator on my 04 was the first exhaust part to fail.
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