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Old 03-23-2013, 12:25 AM
ramsrule ramsrule is offline
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Unhappy 5.7 hemi issues any suggestions

going down hiway eng died..got it towed..only way it will start is if you hold it to floor .it will start and wind out but wind out sounds like it is flooded but when you let off gas it will die..got a po300 code witch is random multiple cyl miss fire...the last thing I done to it was fill with premium apox 50l top up..hit the hiway and died aprox 20miles down road..first thought they may have topped me with diesel but I checked gas at sheader valve on fuel rail and it smells and seems like gas .any suggestions
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Old 03-23-2013, 12:52 AM
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If it died that quickly after filling up I'd be tempted to think you got some bad fuel. It's quite possible that it's either got water in the fuel or there's a lot of crud that was stirred up and it's clogged your fuel filter.
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Old 03-23-2013, 09:59 PM
ramsrule ramsrule is offline
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not a fuel issue checked the pump press and flow...held at 55psi and lots of volume...leaning towards crank position sensor
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Old 04-07-2013, 07:19 PM
guitodd guitodd is offline
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had this problem and it was my EGR valve stuck wide open. No codes thrown, but it caused engine to flood and would only start and run floored. Simple fix.
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Old 04-07-2013, 07:31 PM
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I believe anything emissions related is under warrantee until 150,000 miles or so. I drove my Dodge Magnum thru deep water and fried O2 sensors, though it had about 150,000 miles at the time, dealer replaced sensors free under warrantee.
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Old 04-08-2013, 01:52 AM
jamesb0 jamesb0 is offline
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check the wiring harness and connectors
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Old 04-08-2013, 09:47 PM
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Could be a plugged cat I had that kind of problem with a 2000 5.2 and I could wind it up to about 3400 rpm and then it sounded like it was either flooding or running out of fuel. A quick check is to remove the precat o2 sensor and see if you can get your rpms up. Having the sensor out relieves pressure caused by a plugged cat.
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