N62 misfire

[andrewwynn]

You can't really tell if chain is tight with poking and prodding. It only really is tightened from oil pressure. The chain tensioners should be replaced every 60-70,000 miles.

A couple people have said the reluctor got loose on there N62 throwing the timing off. Did you take pictures with the valve cover off to try to compare and and chance you locked the crank at TDC to confirm timing set correctly?

[raksike]

Today morning I have plugged the CPS sensor connector back to its place.
Warmed up without any misfire sympthoms, after driving to work for around 5km the CEL blinked a couple of times, but the CEL did not stayed illuminated. Most probably it will after some more driving.

The car is a early 2004 model, so most probably the issues are caused by the intermediate lever arms (or how are they called) ?

When comparing the power between yesterda (CPS unplugged) and today (CPS connected) by butt feeling, no difference....

[raksike]

Does it make sense to mess around with the valvetronic valve lift settings? Increase the valve lift.

[EODguy]

Originally Posted by raksike

Does it make sense to mess around with the valvetronic valve lift settings? Increase the valve lift.

NO...

That will start a whole other set of issues


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[raksike]

Now had horrible misfire and it was undriveable, disconnected the CPS again and runs fine.

[upallnight]

Perhaps the CPS is bad and when you unplug it it goes to a default set of values to run the engine.

[X5house]

So I went and pulled the ivm no issues .have vanos ordered but also thinking I need to change the timing .how would I tell if it’s bad ?

[andrewwynn]

Originally Posted by upallnight

Perhaps the CPS is bad and when you unplug it it goes to a default set of values to run the engine.

That's what I was thinking but also the valvetronic I think just stops working completely when CPS unplugged.


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[raksike]

When the CPS would be bad, should the misfire also not be only on that bank, on which the CPS is bad?
Unfortunately I am also quite convinced that it runs better when CPS is unplugged, since the valvetronic is disabled when the CPS is unplugged :/

I have read around, that some vanos solenoids can also cause this issue? Any comments regarding that?

[andrewwynn]

In your case if the valvetronic is misfiring, than disabling it may give a smoother running engine but it's not operatinf well.

Think of it this way:

If without the CPS plugged in you might be at 75% power which might feel ok, but plug in and it's 50%. Both are terrible. You will not solve the problem with CPS unplugged that is a guarantee

If you have errors on one bank only you can swap any parts to test: CPS, vanos solenoid, etc. Swap any and all external parts to exclude them before siding inside