Do not try to drive with a faulty rail pressure sensor or you'll kill plugs (pic)

cxmplex · 09-18-2021, 12:45 PM

Managed to kill spark plugs with only 10k miles taking this to a shop and back for diagnostics. The car will run, but you're utterly destroying the plugs it seems with the excess fueling. Here's how bad they look, pretty damn gnarly. Not even going to bother trying to clean them, swapping em all out:

Any other damage I should be aware of while I'm fixing this back up? I got some new plugs coming today. Sensor replaced, wired a pigtail in, all good now. Only codes showing from the DME is related to these two plugs (cylinder misfire)

Wires · 09-19-2021, 07:59 PM

What does your valves look like? You probably have a lot of carbon built up in there andif so, should get the walnut blasting done.

weehe126 · 09-20-2021, 11:58 AM

That's a lot of buildup for just running rich. Looks more like oil. Id take a scope to the cylinders to see how bad they look.

weehe126 · 09-20-2021, 11:59 AM

Quote:

Originally Posted by Wires

What does your valves look like? You probably have a lot of carbon built up in there andif so, should get the walnut blasting done.

Buildup needing carbon blasting would be outside the cylinder.

Wires · 09-20-2021, 01:03 PM

Quote:

Originally Posted by weehe126

Buildup needing carbon blasting would be outside the cylinder.

Oh good point. Scoping the cylinder is good advice.

cxmplex · 09-20-2021, 01:54 PM

Quote:

Originally Posted by Wires

Oh good point. Scoping the cylinder is good advice.

Is it easy to take a look at this? I'm not really sure where the intake valves are on the b58 lol. Next time I have it in a shop I'll have em check it out if not.

cxmplex · 09-20-2021, 01:56 PM

Quote:

Originally Posted by weehe126

That's a lot of buildup for just running rich. Looks more like oil. Id take a scope to the cylinders to see how bad they look.

I'll have it in the shop in a bit to do a fluid flush and front brake pads (two things I don't really want to do) and I'll have them take a look at the cylinders.

cxmplex · 09-20-2021, 01:57 PM

Quote:

Originally Posted by weehe126

That's a lot of buildup for just running rich. Looks more like oil. Id take a scope to the cylinders to see how bad they look.

I also ran boostane on these for about 5k miles, and I know that fucks up your plugs.

09-18-2021, 12:45 PM	#1
cxmplex Private First Class 44 Rep 90 Posts Drives: 2018 340i GT Join Date: Oct 2020 Location: Boston iTrader: (0)	Do not try to drive with a faulty rail pressure sensor or you'll kill plugs (pic) Managed to kill spark plugs with only 10k miles taking this to a shop and back for diagnostics. The car will run, but you're utterly destroying the plugs it seems with the excess fueling. Here's how bad they look, pretty damn gnarly. Not even going to bother trying to clean them, swapping em all out: Any other damage I should be aware of while I'm fixing this back up? I got some new plugs coming today. Sensor replaced, wired a pigtail in, all good now. Only codes showing from the DME is related to these two plugs (cylinder misfire) __________________ 2018 BMW 340i GT \| BMS Intake \| Autowerke Catted DP \| MHD E40 Mix Stage 2+ Tune \| FX-150 HPFP Last edited by cxmplex; 09-18-2021 at 12:58 PM..
	Appreciate 0 Tweet Quote

09-19-2021, 07:59 PM	#2
Wires Brigadier General 1666 Rep 4,929 Posts Drives: 2016 340i xDrive Join Date: Apr 2008 Location: Calgary iTrader: (0)	What does your valves look like? You probably have a lot of carbon built up in there andif so, should get the walnut blasting done.
	Appreciate 0 Quote

09-20-2021, 11:58 AM	#3
weehe126 Brigadier General 1161 Rep 3,191 Posts Drives: 2017 340i Join Date: Apr 2014 Location: San Antonio iTrader: (2)	That's a lot of buildup for just running rich. Looks more like oil. Id take a scope to the cylinders to see how bad they look.
	Appreciate 0 Quote