Engine misfire on cylinder 1

[Sam2011wrx]

Anyone know what's going I got a check engine light code P0301 and the cylinder 1 is misfiring on 02 wrx?

 

[drvsdwz]

compression check. could be plugs or wire or coil pack, but since you would be in there to check the spark plug, do a compression check while you're at it. Hopefully not ringlands...

 

[WRB96IMPREZA]

When was the last time you changed plugs and wires?

 

[Matt]

Pretty sure it's coil on plug. Do the basic diag. Swap the coils and clear the code. See if it returns on the same cylinder or jumps. If it does that its a bad coil. Swap plugs and repeat if no change. Poss bad injector and so on.

 

[Sam2011wrx]

Alright I'll try the to switch the the plugs and see what happens thanks

 

[WRB96IMPREZA]

That's the code mine was kicking then I changed them and he ran mint.

 

[skipow]

also spark plug gap. rarely a problem, but i've seen the gaps all messed up from some "special" mechanics.

 

[DShane]

ALWAYS GAP YOUR SPARK PLUGS!!!!!!!!

I had the same problem on my 02 REX when I had it, I put new plugs in and didn't gap them and it was still throwing the code, so I went BACK in and changed the plugs AGAIN, only this time I gapped them. The difference was unbelivable. From the factory those plugs can be up to .1 off from eachother, and if they are all gapped exactly the same you're engine will run mint.

 

[skipow]

ive seen kids drop them on the ground, smash the electrodes on top and then put em right in the engine. HURRDURRRR

 

[Flipswitch]

+1 to plugs & wires

 

[Matt]

Plugs and coils. Doesn't have wires

 

[MAINIAC XV]

If you car is stock, than it should be covered by the warranty.

 

[Matt]

It's an 02. No warranty !!

 

[Rmayo]

check to make sure your distributor is set at the right timing...

just being sarcastic to see if matt will yell at me too

 

[Matt]

Wtf is a distributer!!

 

[Rmayo]

That's where the wrx plug wires are duh!

 

[Meyagi]

burnt valves. becoming more and more common on the older turbo cars. got one sitting at the shop now waiting to be repaired.