crystal dagger
Hey guys I’m tryna find the misfire in my 800 dollar shitbox 2010 bmw 528xi. So far I’ve pulled the spark plug and it looks like this. I’ve also swapped the fuel injectors what else can I check?
I have a valve cover gasket leak but that will be fixed for free by bmw due to a vanos bolt recall
steady flax
you can try swapping the coil for the cylinder 5 coil to see if the misfire moves.
tiny kindle
And don’t forget to clear codes when you move the coil to see if it comes back on same cylinder. Assuming you did that when you moved the injector
crystal dagger
I switched the ignition coils before I pulled the plug the misfire didn’t disappear, if I don’t clear the code would it keep misfiring
I’m picking up the spark plug in about an hour
I havnt turned on the car since I pulled the plug and switched the fuel injectors
crystal dagger
Ok I switched the spark plug, the injectors, ignition coils. It’s still misfiring same cylinder
tiny kindle
Time for a compression test
crystal dagger
Time for a compression test
How much does a kit cost
Is there any specific kits I get?
tiny kindle
You might be able to rent one from a local auto parts store, if not a harbor freight one should do just fine as You’re not looking for super precise measurement just to see if they’re all roughly equal.
steady flax
lets say if the compression is good, what else could be the issue
could be power to the coil
or it could be carbon buildup on the valves
crystal dagger
could be power to the coil
How do I check that
steady flax
you can remove the plug an coil and ground the spark plug to the valve cover then start the car for a sec to look good spark.
be careful not to zap yourself
that'll wake you up
tiny kindle
lets say if the compression is good, what else could be the issue
And full disclosure, a failed compression test just means more troubleshooting is in order, as there’s a mechanical concern. Don’t want to go down that road unless you have to.
crystal dagger
you can remove the plug an coil and ground the spark plug to the valve cover the...
oh ok bet ill try that
what if i put cylinder 5's wire into cylinder 6 and cylinder 6's wire into 5
crystal dagger
ohh ok
so when you say ground to the valve cover, i put the thread in a way where it touches any part of the of the valve cover
steady flax
the little arm at the end on the plug is the ground strap
crystal dagger
the little arm at the end on the plug is the ground strap
oh okkk Ill test it out then