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  #1  
Old 12-11-2012, 11:00 PM
eddie7644 eddie7644 is offline
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Default CEL shows misfires but no misfire

I have a 97 1500 5.2L. The problem im having is i keep getting misfire codes, random misfire on all cylinders. There is no obvious misfire I mean I dont feel anything the truck runs great. I will clear the codes and when I get on it like merging onto a highway the CEL will flash then stay on and show all cylinders randomly misfiring. I have replaced cap, rotor, plugs, wires, crank sensor, distributor, hollowed cat. Like I said you do not feel any misfire it runs great. Any ideas would be greatly appreciated!
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Old 12-12-2012, 09:49 AM
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What codes are you getting and have you replaced the intake manifold plenum pan gasket?
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Old 12-12-2012, 11:33 PM
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I am getting PO300-308. Yes I replaced the gasket I actually bought the Hughes upgrade aluminum was I also replaced the fuel pump, MAP sensor, IAC valve and TPS.
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Old 12-13-2012, 12:47 AM
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How many miles are on the O2 sensors? O2 sensors can create a bunch of problems.
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Old 12-17-2012, 01:27 PM
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Maybe about 50,000 on them
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Old 12-17-2012, 03:56 PM
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Hm, there about due but shouldnt cause a misfire. Did you make sure that the cap is screwed in tightly? Make sure none of the wires are loose and rubbing on each other.
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