Computer codes 301???

[MINIHEMI46]

Hi Everyone, I have a friend with a problem with my 03 non turbo cruiser with auto trans. The computer reads a 301 code which is a misfire on #1. he has replaced plugs, wires, coil pack, moved around the fuel injectors, did the WD-40 on the intake, did the chevron bottle in the fuel and still has the miss on #1. It seems to run fine once he gets going and fuel economy hasn't changed. But when parked or just taking off it has the miss.
He doesn't know what else to try, Almost at the point of replacing the head gasket. Anyone have any idea's?????

[CREWZIN]

That's a good one. Seems like he did all the right stuff to fix the problem. Is he taking off the negative battery cable for about 5 minutes to clear the old code? Once he does that the dial should read "donE" to say there's no codes. Then if it's still bad after starting up and running the "P301" code will come back.

Is he loosing any water or oil, burning anything out the exhaust? Sure signs of head gasket.

Might want to take it to one of the places that do a $25 computer hook up to see the actual spark from each cylinder to rule out ignition breakdown (I know he replaced everything) but can't hurt since he's throwing parts at it without a real diagnostic, $25 won't hurt.

[mjb457]

Must be common problem with the Pt..wires & Champion 7570 fixed mine with help from Crewzin's input.. mine was missing on both #1 & #3 ..anyway ok now with full computer check..

[MINIHEMI46]

I talked with him today and it's still missing, you can see the engine shake when it misses and hear it too. I didn't check the dipstick to see if AF was mixed in the oil but he said there wasn't, but i really don't think it's the head gasket. He was showing me what it does when it's cold, as it first started it seemed fine, then about 5 seconds it start missing again. He's also thinking it's the EGR valve too but I think that would throw a code too. Also he's thinking a burnt valve? Is the valves on the PT hydraulic?, if so could one of the lifters be breaking down? That's could be why when the oil pressure builds up the lifter is working just ok and it doesn't miss as bad and doesn't notice it. Any thoughts Guys
Thanks