Check Engine Light- Emission Leak! - Pontiac GTO Forum
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post #1 of 7 (permalink) Old 05-22-2010, 04:00 PM Thread Starter
 
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Check Engine Light- Emission Leak!

I am continually receiving a check engine light on my stock 04 GTO. When the OBDII reader is plugged up, I get a p0442 code. When code manual referenced, it says it is this is a emission leak. I have been told this is common due to bad gas cap. It's been replaced and still get check engine light couple days after erasing code. What else to consider???
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post #2 of 7 (permalink) Old 05-22-2010, 05:15 PM
 
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May want to check the vacuum hoses on the charcoal canister between
the rear wheel. It's next to the rear end chunk. I knocked a hose off mine
while mounting my airbags, and had the same problem you are having.

Larry

2005 GTO Quick - 1984 Honda V65 Magna Quicker - 2004 Z06 Quickest
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post #3 of 7 (permalink) Old 05-22-2010, 06:14 PM Thread Starter
 
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Thanks Larry! I will look into that.
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post #4 of 7 (permalink) Old 05-22-2010, 07:44 PM Thread Starter
 
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Is the charcoal canister black, rectangular looking box? Thats the only thing I see with some hoses coming out of it. If so, they seem pretty snug....
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post #5 of 7 (permalink) Old 05-22-2010, 08:31 PM
 
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Yep thats the cannister

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post #6 of 7 (permalink) Old 05-23-2010, 07:13 AM
 
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Probally the gas cap. I'd replace it again. As small of a leak that is needed to cause the CEL, you will have a tough time finding it without a gas test.

My old Sebring had this CEL and it ended up not being the gas cap. Took it to a good shop and they ran the gas test 3 times and couldn't find the leak. I got pissed and just put zip ties on the end of each hose back there and my problem was fixed. Guessing it is because they glue the hoses rather then clamping them. Maybe the glue doesn't last forever.

2003 Corvette Z06 - MGW shifter, Corsa X pipe, Corsa Xtreme exhaust, Texas Speed long tubes w/o cats, PowerStop rotors/pads, Conti DWS tires, C6Z51 F&R sways, C5R headlights, tuned

04 GTO - sold

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post #7 of 7 (permalink) Old 05-23-2010, 10:24 AM
 
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You need to do the smoke test, or flash the code out.
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