[Benji26]

I dont know if my headgasket is fucked or if its just an easy fix. My 6th cylinder has been misfiring so i replaced the spark plug and coil pack, it didnt help. So I had a compression test done on my car. Cylinder 6 has only 60psi when the others have over 160psi. Also the new spark plug was black on tbe threads after a week. My car loses coolant and oil but only smokes every once and a while. Also never over heats. I'm not sure whats wrong the shop wanted $500 to take off the intake manifold so I just took it home.

[Ballistic]

Stop running the car before you hydro lock it and get the head/gasket checked out.

I doubt that the shop told you something else. This isn't a few dollar fix. Bite the dust and pull your wallet.

[LucasAry]

Originally Posted by Ballistic

Stop running the car before you hydro lock it and get the head/gasket checked out.

I doubt that the shop told you something else. This isn't a few dollar fix. Byte the dust and pull your wallet.

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[mweisdorfer]

Originally Posted by Benji26

I dont know if my headgasket is fucked or if its just an easy fix. My 6th cylinder has been misfiring so i replaced the spark plug and coil pack, it didnt help. So I had a compression test done on my car. Cylinder 6 has only 60psi when the others have over 160psi. Also the new spark plug was black on tbe threads after a week. My car loses coolant and oil but only smokes every once and a while. Also never over heats. I'm not sure whats wrong the shop wanted $500 to take off the intake manifold so I just took it home.

I highly doubt it's the head gasket.

Head gaskets on this platform is really, really rare. More likely the culprit is the oil filter housing gasket. It's leaking internally. The coolant & oil are literally right next to each other & only separated by literally a small strip of rubber.

It could be a bad injector on cylinder 6. However, make sure you follow the rules about the replacement of just one injector. You'll need to know what generation your current injectors are before you buy a new one. Unfortunately, the cost of 6 new injectors has almost doubled in the last 4 months.

I'm not exactly sure how pulling the intake manifold off would help you fix the problem to be honest.

This is the best price I have seen them to date:

https://m.eeuroparts.com/Parts/14631...A2C9521190280/

[Ballistic]

He reports low compression in cilinder 6. This isn't an oil filter housing problem.
Bad injectors won't give a 100psi compression loss.

[CeeWhizzle]

I'd start with the injector on Cyl 6. An injector with a bad seal can also cause low compression and miss fires.

[feuer]

Originally Posted by Ballistic

He reports low compression in cilinder 6. This isn't an oil filter housing problem.
Bad injectors won't give a 100psi compression loss.

If the injector doesn't seal it would show compression loss. It would also misfire.

[Emilime75]

Originally Posted by feuer

If the injector doesn't seal it would show compression loss. It would also misfire.

Good point. I, too, thought the injector couldn't be the cause of low compression, but this makes sense being direct injection.

[Ballistic]

My car loses coolant and oil

Not a sign of a leaking injector seal.

[mweisdorfer]

Originally Posted by Ballistic

Not a sign of a leaking injector seal.

No, but it is a sign of misfiring. Assuming that the plugs and coils are good.

I think he has two issues.

1) a bad OFHG (internally)
2) a bad injector on cylinder 6

[Emilime75]

Originally Posted by Ballistic

Not a sign of a leaking injector seal.

Originally Posted by mweisdorfer

No, but it is a sign of misfiring. Assuming that the plugs and coils are good.

I think he has two issues.

1) a bad OFHG (internally)
2) a bad injector on cylinder 6

Right, kinda thinking the same. Very possible it's 2 separate issues, although I'm not thinking internal OFHG...as that should show up as milky froth in the oil.

[Dmak]

Do a leak down and see where its leaking. With compression at 60psi only. U will find where its leaking with leak down test.

[N54B30A]

Originally Posted by Benji26

I dont know if my headgasket is fucked or if its just an easy fix. My 6th cylinder has been misfiring so i replaced the spark plug and coil pack, it didnt help. So I had a compression test done on my car. Cylinder 6 has only 60psi when the others have over 160psi. Also the new spark plug was black on tbe threads after a week. My car loses coolant and oil but only smokes every once and a while. Also never over heats. I'm not sure whats wrong the shop wanted $500 to take off the intake manifold so I just took it home.

Likely not the headgasket as they are 5 layers of steel. My money is on the ringland. I had mine fail recently, another good test would be to pull the pcv hose off at idle and see if theres a significant amount of smoke aka blowby.

[feuer]

Originally Posted by sahyoun

Likely not the headgasket as they are 5 layers of steel. My money is on the ringland. I had mine fail recently, another good test would be to pull the pcv hose off at idle and see if theres a significant amount of smoke aka blowby.

Was the piston rings damaged from deluted oil from leaking fuel injector?

[N54B30A]

Originally Posted by feuer

Was the piston rings damaged from deluted oil from leaking fuel injector?

I was running E60 for around 20k miles, was running 3k oil and spark plug intervals. I had an oil analysis done around 3k and the oil had extremely low fuel dilution compared to the accepted values and the viscosity was well within spec too. So I dont think I had a lot of fuel dilution but then again i was running a terrible pcv setup.

I was on index 1's and had no issues, the AFR's would sit steady at 234.95 and get there pretty quickly without much of a margin between banks. I honestly think too many low rpm high load pulls created hotspots and detonation. I had VTT stage 1's so it had a lot of low end torque. The piston rings on cyl 4 broke because a decent piece of the ringland came off. It happened at 119k but the i was driving it for 3 weeks before I figured out the issue, it was dead even with a stock f10 m5 on 5 cylinders when I did a pull.