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  #13  
Old 04-24-2013, 12:35 PM
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Well im definately no expert, but my wrangler was having trouble holding idle, and this was the cure. I hope this helps.
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Old 04-25-2013, 09:43 PM
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Thanks cleaning the idle control sensor worked
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Old 04-25-2013, 09:57 PM
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Great!
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Old 05-04-2013, 12:39 PM
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The jeep has went back to acting up in idle it has thrown the codes p0455 and p0442 which is a small leak and a large evap leak
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Old 05-04-2013, 01:32 PM
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Re: 2004 jeep grand cherokee 4.0

Did you check the vacuum lines going to the evap canister behind the left rear wheel? These lines pass around the rear axle, where the rubber hose dries out and breaks.
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Old 05-04-2013, 01:48 PM
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When I changed the fuel filter and it kept dying when it was idling. If you held the fuel lines there it felt like the fuel kept shutting off and coming back on and you can kinda hear a sucking sound right around where your talking about
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Old 05-04-2013, 06:37 PM
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Re: 2004 jeep grand cherokee 4.0

If you want to know if a leak in the evap line is causing the problem, you could easily plug the line under the hood. The purge solenoid is mounted on the left fender (seen from drivers position) and you could follow the lines to see which one is going to the engine inlet duct. You could plug that one temporarely to test. But you have some vacuum leak for sure if you hear a hissing noise at the rear, so you better just try to solve that and be done.
Never touched the fuel lines, but as far as i know will the fuel pump run constantly when the engine runs and will the fuel pressure regulator in the filter assy regulate the fuel pressure to around 45 PSI (when im not wrong about the figure) and will the surplus fuel be send via the return line back to the tank.
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