To Misfire or not?

[80stech]

You replaced the intake CAMshaft sensor NOT the CRANKshaft sensor. Coil grounds are on the valve cover studs. You might check if o2 sensors are not switched.

[andrewwynn]

This is the bank one ground.

[270_BMW]

Ah that’s right... I thought about replacing that one, but wasn’t sure if it would make a different. The intake camshaft sensor was the one causing a similar problem for someone else so that’s the one that got swapped.

I haven’t touched the O2 sensors, do they become a possibility since the Crankshaft position sensor wasn’t swapped?

Since the grounds are on the studs themselves... perhaps there is oil corrosion from the valve cover gasket that could keep it from grounding as it should?

Edit*
I did have oil pooling around that ground...

[andrewwynn]

The ground usually fails by corrosion at the wire to terminal connection. Need to measure the Ω with a meter and wiggle the wire ends to see if the resistance changes


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[270_BMW]

So after a 400 mile road trip for doctors appointments not a single issue out if it. When I got back to town I cleared the codes and ran up to the store which is just short of a 3 mile round trip. Exhaust camshaft position sensor and one of the pre cat 02 sensors... o boy.

I should be getting my new valve cover gasket in the mail today which means I will get that done today or tomorrow. Probably gonna check out the exhaust camshaft sensor too and take it out and clean it since that lip is covered in oil crude from the valve cover gasket. Not sure about the pre cat 02 sensors though, I know they rest on the fuel rail, not sure where they run to though.

[andrewwynn]

Pre Cat are on the right side of engne outside of the engine cover. Easy access. See my thread I just made after replacing mine.

[270_BMW]

Originally Posted by mr_robot

Did changing the crank position sensor solve anything?

To answer your question finally... yes I think that is what solved the issue.

I've replaced the intake sensor and quite a few other things as well... but I am confident that was what was causing the issue, of course since I've changed only the intake camshaft position sensor my exhaust one is playing up and giving me codes. Perhaps its better to replace them both in tandem? Thankfully the exhaust sensor isn't difficult to get to. Since I have it all back together with the shotgun method I haven't had a bit of issues from it, even repeating the same test several times.

[270_BMW]

Originally Posted by andrewwynn

Pre Cat are on the right side of engne outside of the engine cover. Easy access. See my thread I just made after replacing mine.

I am hoping that the O2 Sensor codes are more a-symptomatic than anything, I've been told from the STEALERSHIP that O2 Sensor Codes can appear if there is a code being generated by the camshaft position sensor on the exhaust side.

So of course this in the mail to be replaced as well to see if the O2 codes go away.