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JakeM717
Novice
Jul 15, 2011, 7:43 AM
Post #1 of 9
(1604 views)
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2006 Cadillac Escalade ESV
6.0 Litre V8, AWD
Standard Edition.
Hello: Stopped to refuel a few weeks ago. After refueling, it started kind of rough. Actually had to hit the gas to get it to catch. Finally started and it runs and starts great now, but the "Check Engine" light has come on.
Had to get a Massachusetts Inspection Sticker and was rejected. A friend has a diagnostic computer, hooked it up and said it was the gas cap. Replaced that, reset the codes, drove it for 150 miles, NO sticker,
Had to refuel, again tough start, check engine light came back on. New diagnostic check, says canister purge valve, replaced that. Resete the codes again, drove it for 150 miles, still, no good..
I'm kind of at wits end., anyone have any idea what it might be or what is causing it. I have to believe it's caused by the refueling and starting roughly...
Again, once it starts, it runs great, and starts great, just that initial start right after refueling...
HELP!!!
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Discretesignals
Ultimate Carjunky
/ Moderator
Jul 15, 2011, 9:46 AM
Post #2 of 9
(1594 views)
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Re: EMISSIONS????
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What is the trouble code number?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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JakeM717
Novice
Jul 16, 2011, 9:19 AM
Post #3 of 9
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Re: EMISSIONS????
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P0496 Says its emissions, purge valve. I replaced the purge valve.
Just found out, there are 2 of them. 1 in the rear, which I changed and 1 under the hood. I'll do that today and let you know how I made out...
Thanks
Jake
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 16, 2011, 12:04 PM
Post #4 of 9
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Re: EMISSIONS????
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Having a code referring to a specific component does not mean replace the component. It gives you specific details about the problem that require further diagnosis to determine the cause. This code doesn't even name a specific component. the code means "Evaporative emissions flow during non purge"
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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JakeM717
Novice
Jul 16, 2011, 12:19 PM
Post #5 of 9
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Re: EMISSIONS????
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No argument on what you said Hammer.
So what would your next step be??
I'm doing this stuff in the garage at my house. I don't have access to all the modern technology that some do. Canister purge valves are purchased on line for 25. to 30. Not a huge expense to change them out...
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 16, 2011, 12:44 PM
Post #6 of 9
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Re: EMISSIONS????
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You can throw parts at it if you want but it will probably be futile. This is not a DIY type diagnosis. You need a scan tool and smoke machine just for starters.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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JakeM717
Novice
Jul 16, 2011, 6:59 PM
Post #7 of 9
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Re: EMISSIONS????
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Well I guess I'd rather throw parts at it Hammer. I see your ASE and guessing you work for either a dealer or own your own shop. Either way, I started at the Caddy dealer, after 2 hours at 100 per hour, I got fed up as they still couldn't tell me what the issue was. So for 200. I paid them, I can buy and replace a lot of parts. The wheels on the industry machine keep rolling. Since I was 16 and bought my first car, they've all been GM, I've never owned another make. Actually spent 2 weeks on Caddy Forum prior to this one. Bottom line..
It's time for a Lincoln or Ford, at least they didn't take our money to bail them out, and seem to have a bead on things.
GM, MORONS!!! They still don't get it...
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Discretesignals
Ultimate Carjunky
/ Moderator
Jul 16, 2011, 8:39 PM
Post #8 of 9
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Re: EMISSIONS????
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The valve you changed in the rear is the canister vent valve. That won't cause that code to show up.
The one you want to check out in the canister purge valve up at the engine. Unplug the electrical connector from the valve. Then remove the hose that goes to the charcoal canister from the valve. Start the engine and feel for vacuum on the end of the valve. If you feel vacuum, replace the purge valve.
If the purge valve is stuck open when your refueling the engine, fuel vapors go into the intake manifold. When you start the engine, it will run extremely rich causing your rough idle.
There are only two things that can cause that code and my guess is the purge valve is faulty. The only other thing that can cause that code is the fuel tank pressure sensor which wouldn't cause the symptoms you get after refueling.
The purge solenoid is located on
top of the intake right behind the throttle body.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jul 16, 2011, 8:46 PM)
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JakeM717
Novice
Jul 16, 2011, 8:54 PM
Post #9 of 9
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Re: EMISSIONS????
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Thanks for your input. I'll check it out first thing Monday morning.. Hope it works..
Really tired of shelling out $$$ into this vehicle..
I'll say this, last Caddy I'll ever buy. Nothing but trouble since day 1... Power windows, tranny, wiper motor, rear axle bearing...All covered under warranty when new, but 78,000 for a new vehicle and all those problems. Time for a Navigator L series.. Maybe Ford/Lincoln has it together. Can't be worse than the Caddy...
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