MISFIRE

[French941]

2015 GTI 85k miles. Zero issues, then bam… crap idle and misfire. OBD11 says cyl 2 misfire and hide cylinder. Coil packs and plugs replaced, new fuel injectors installed, still misfiring… new manifold on the way. Any advice?

 

[Diggs24]

Check for carbon build up then it's time for a compression and leakdown test.

 

[JC_451]

Diggs, you spelled "part out " wrong.

 

[French941]

Check for carbon build up then it's time for a compression and leakdown test.

Thanks, this is what she looked like.

 

[Diggs24]

Yeah give that a good cleaning and report back.

 

[French941]

Diggs24. Cleaned the carbon. New intake manifold installed (last set of codes listed stuck open and stuck closed) Same misfire and fault code cyl 2 and hide cyl. Need to have compression test done.

 

[Diggs24]

Arg, not good.

 

[French941]

So based on what I’ve gathered I think I’m going to drop the oil pan and see if there’s chunks of piston in there. I need to drink more.

 

[Daks]

I'll have one for you. Best of luck man..

 

[JerseyDrew77]

So based on what I’ve gathered I think I’m going to drop the oil pan and see if there’s chunks of piston in there. I need to drink more.

Do you have a borescop or know someone that does? If you do, take a look down into the cylinders to see if there is any damage.

 

[ChrisMk77]

Do you have a borescop or know someone that does? If you do, take a look down into the cylinders to see if there is any damage.

Hard to see if just shat out a ringland and lost compression

 

[French941]

Appointment Saturday with a mechanic. We will see! Fingers crossed it’s repairable and not a complete engine swap. Thanks

 

[JerseyDrew77]

Hard to see if just shat out a ringland and lost compression

You'll see some damage to the cylinder walls.

 

[uberdot]

Did you get a compression test yet?

 

[ChrisMk77]

You'll see some damage to the cylinder walls.

Not always the case, have seen several from the EA888 engine builders group post clean cylinder wall pictures after teardown.

Edit: Went for a quick look for pictures but to lazy to get to the ones I was thinking of but this piston did apparently not damage the cylinder.