N62 misfire

[EODguy]

Originally Posted by JeffC

Since you are this far deep into this teardown, if they have not been changed before, I would suggest you consider changing the alternator bracket gasket (12317507808) and the coolant pipe (11141439975).



After all this, you'll have a bullet proof X5.

+1
Great idea to do now.

Enjoy that mouse eared bastard, I did

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[andrewwynn]

+ 100


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[murmansken]

Originally Posted by JeffC

Since you are this far deep into this teardown, if they have not been changed before, I would suggest you consider changing the alternator bracket gasket (12317507808) and the coolant pipe (11141439975).

After all this, you'll have a bullet proof X5.

Yes they where at the picklist just waiting for the parts to arrive

[murmansken]

Originally Posted by andrewwynn

I've never seen a chain stretch significantly. Please take a picture.



This is a 180,000 mile chain from M62.

Since only one chain it's much longer and this one is only maybe 7-8mm longer out of close to 2000mm.

If the chain actually stretched It would be the first time I've ever seen it.

Yes I will take a picture and compare the chains. It certainly looks like they are streched but it could be the guides that are completely ruined. I have not removed the chains and guides yet...

[andrewwynn]

Without some absolutely amazing defect I can’t imagine a chain actually stretching. The tiny amount is “Stretch “in the chain that I replaced it was certainly just wear at every pin .

On the M 62 with maybe almost a 2 m long chain it was only about 8 mm longer than new but it felt more like an inch because of the guides being gone

[murmansken]

Yes I agree with that i've only seen really stretched chains on a VAG 1.3l engine and a chinese atv.

[murmansken]

Hello folks, well the x5 is alive again, the timing chain was almost a link longer than the new ones. Perhaps there was longer chains in early n62 engines because the guides was replaced with a new type. Made it without removing cylinderheads but I had to cut the guide bolt on bank 1 about 4mm to get them in there.

The old guides fell apart just looking at them so I was really lucky, I did get 2 fault codes though on one coil and zk10 battery ignition switch (srs). The coil was an easy fix the rubber on it was broken so the spark flew all over the cyl head. But the zk10 code is anoying don´t think I could have broke the explosive charge on the battery terminal... Only removed negative terminal.

Any suggestions on that zk10 fault code except from 2ohm resistor?

[StephenVA]

Check your grounding cables...

[murmansken]

Originally Posted by StephenVA

Check your grounding cables...

They are all in place already checked. The fault code is for battery + terminal but it is not blown but resistance to high!

[andrewwynn]

Resistance high across the bst? If you can crank, what kind of voltage drop if you measure from cig lighter to B+ under the hood?