Misfire

[cdahlen]

2011. Have a misfire in cylinder 8. I have changed the spark plug, coil pack & injector. Where should I head now? Would a vacuum leak cause a misfire code in only 1 cylinder? (I ask because a guy at work said leaks can cause misfired)

 

[Adieu]

Does it come back, or did it never go away even for a second when you changed the spark plug, coil, and injector?

Could be iffy wiring to the coil if it is/was intermittent

Could be a a busted rubber or body damage somewhere or a coolant expansion tank leak allowing liquids to get into the spark plug well if it first went away but returned later


PS #8 should be rearmost driver's side, is that the one you swapped? I know it sounds like a funny question, but these things happen. And apparently some cars number em differently

 

[cdahlen]

Never really went away. Yes it's the drivers side next to firewall.

 

[07navi]

2011. Have a misfire in cylinder 8. I have changed the spark plug, coil pack & injector. Where should I head now? Would a vacuum leak cause a misfire code in only 1 cylinder? (I ask because a guy at work said leaks can cause misfired)

Head for the compression tester. Also change all those things again in the compression is good.

 

[Adieu]

Maybe run a bit of injector cleaner just in case? Who knows maybe there's gunk on the fuel rail where it feeds into number 8

Or try swapping over plug, coil, and injector from 8 to another cylinder. Factory duds DO occasionally happen.

 

[07navi]

Hook up a good scanner to it.

 

[cdahlen]

 

[cdahlen]

May have found 1 of 2 causes. After new plug put in, still had a code, moved the coil pack, code followed the coil. Put a new coil pack. No more CEL. (For now)