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eddie7644 12-11-2012 11:00 PM

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!

RamTech 12-12-2012 09:49 AM

What codes are you getting and have you replaced the intake manifold plenum pan gasket?

eddie7644 12-12-2012 11:33 PM

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.

panhead 12-13-2012 12:47 AM

How many miles are on the O2 sensors? O2 sensors can create a bunch of problems.

eddie7644 12-17-2012 01:27 PM

Maybe about 50,000 on them

panhead 12-17-2012 03:56 PM

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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