Help! P0300, p0301, p0302

[Chandler_Ross]

Alright guys. So as some of you know, my motor has been destined to fail for quite some time now. (Check my Timeline Thread for entire story.) I've got a solid lit CEL and its throwing codes P0300, P0301, and P0302. Multiple / Random misfire, misfire cylinder 1, misfire cylinder 2. What can cause 2 cylinders to misfire at the same time? I'm leaning toward head gasket failure as i'm seeing puffs of white smoke on a cold start. It is at my mechanics shop right now. I'm waiting to hear back. The motor already has a piston slap. I'm thinking the damage to the pistons is beginning to take its toll on the motor. Could that be why I'm getting simultaneous misfire? It has blown 3 head gaskets. One of them not even 20,000 miles ago. I've had it about for almost 14k and no problems until now. I've researched and come up with nothing where 1 and 2 went bad together. I'll probably swap a used motor in it because I fear this one is too far out of spec to rebuild. Any ideas?

I believe I may be on original plugs and wires too. I hate neglectful previous owners... and tight budgets.

 

[kball]

3 head gaskets and it still has the original plugs and wires?? Somebody needs a new mechanic! If they are original I'd start there to fix the misfiring.

 

[LittleCaesar]

Ask him for compression check numbers.

Are you losing any coolant over time?

As with Kevin, replace the wires and plugs. Then start looking for a used engine (Car-Part.com--Used Auto Parts Market) and you can switch over the new plugs and wires if you have to go this route.