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Old 08-21-2017, 11:52 AM   #1
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Newbie with a question

Hello everyone, new to the forum. I just bought a 2004 Ram 2500 4x4 with the hemi. With he exception of a 2" lift and a single chamber flowmaster muffler (probably changing that), it's stock with 166k on the odometer. Even though it ran great, I changed all the fluids (Oil, both diffs, transfer case, and trans filter change), added a Volant fresh air kit, and changed all 16 spark plugs (big fun). I was quite proud of myself when I started it up and got no check engine light. That all changed the next morning when the wife went to run an errand and ask me about the little "engine thingy" lit on the dash. Ran it up the local parts house for an OBD II read and came back with a Purge Valve Solenoid failure. I checked all the hard plastic lines from the firewall to the solenoid in case I cracked anything changing out the plugs, all looked good. Made sure the gas cap was tight and didn't find any obvious cracked/burned hoses under the truck. I replaced the solenoid and still get the check engine light. I already did a forum search and came back with all kinds of possible causes. Any thoughts why I could get an hour plus of run time with no light after the upgrades/repairs, let it set overnight, and then get a light at start up? Runs great, just has the light on, which drives me crazy.

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Old 08-21-2017, 01:25 PM   #2
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Welcome to the forum. There's two vacuum lines connected to the manifold on the drivers side just behind the throttle body. The larger of the two goes to the brake booster snd the other to the purge valve. They are easy to knock off while changing plugs.
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Old 08-21-2017, 01:28 PM   #3
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Purge valve is pretty simple. If you put a new valve in and get the same code then it's likely electrical issue in being a loose connection,cut wire or bad pcm. Passenger side where the harness runs over the engine in that lovely back corner make sure the wires are not rubbed thru the insulation onto the valve cover. Also make sure the wires did t get eaten by an animal under where the solenoid is plugged in by the battery tray there

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Old 08-21-2017, 02:02 PM   #4
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Thanks guys for the suggestions. I noticed that the two vacuum lines on the throttle body were "loose" fitting, after I accidently pulled the booster hose off while wrestling with the last two plugs on the driver side. I trimmed off some of the hose ends to get back to virgin rubber and a better seal. I'll look at the wiring insulation better to see if something didn't get worn or pinched while I was doing maintenance. I'm sure I jacked something up while I was changing the plugs, I just can't find it.
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Old 08-21-2017, 02:46 PM   #5
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Old 08-21-2017, 04:29 PM   #6
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Good luck with the troubleshooting, take your time and look over everything near the spark plugs for a loose connection, or some other issue.

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Old 08-21-2017, 05:46 PM   #7
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Old 08-22-2017, 02:57 AM   #8
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Old 08-22-2017, 05:33 AM   #9
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Old 08-22-2017, 07:30 PM   #10
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