BMW M42

[Alex DTA]

The crank scope in the video shows noise at roughly TDC on every compression.
99% chance that's noise from the coils firing the spark plugs.

What spark plugs are you using?
What HT leads?
Is the crank wire shielded, with the shield drained at the ECU end?

[Topgun]

Hello
ok
its a zetec coil ,
NGK R plugs
the ht leads that came with it , no idea of make / model
the crank wire runs up alongside the block , then through a plastic cover , then connects to the loom
I do not know what you mean by "with the shield drained at the ECU end ?" sorry

everything on the engine (as above) is as it was before I removed it , the only thing I have done to the car is to wire up a lamp pod , fit some gauges (oil pressure / oil temp ) and fit a quick release steering wheel .

I attach the build sheets FYI

[stevieturbo]

Those images give nothing of any real use.

Although someone has coloured in cam sensor, but at no point on any trace is there a cam signal.

There are some vary basics you do not understand, there are questions not being answered. There are tests to do, that you are unable to do. There is information that just is not getting out.

It may be time to take the car to someone who can diagnose.

[Topgun]

@ stevieturbo
ok , well I have always been taught that all information is useful that's why I put it in , yes I accept there are somethings I don't understand , that's why I came on here for help , I have done the tests you asked me but not to your standard it appears ( I am trying to hold a phone and press buttons etc at the same time , doing my best you realize ) I have given all the info that has been asked , e'g what coil , which I have answered TWICE !! I have answered Alex dta's questions , but not had a reply ??
Tell you what , I'll send you my 11 books on the exams I had to pass to get my pilots licence , once you have studied them I'll take you up in my aircraft , then I'll let you fly her , navigate her, do all the radio work etc, and then land her , lets see how you get on ?? theory and practical !!
its not the same thing ok .
yes Ill take the car somewhere , hopefully they will be less sarcastic than you .

[Alex DTA]

Hello
ok
its a zetec coil ,
NGK R plugs
the ht leads that came with it , no idea of make / model
the crank wire runs up alongside the block , then through a plastic cover , then connects to the loom
I do not know what you mean by "with the shield drained at the ECU end ?" sorry

everything on the engine (as above) is as it was before I removed it , the only thing I have done to the car is to wire up a lamp pod , fit some gauges (oil pressure / oil temp ) and fit a quick release steering wheel .

I attach the build sheets FYI

The shield drained means that the shield on the crank sensor wire needs to be joined to the sensor ground at the ECU end of the crank wire.
Has that been done?

From what i can see, you have coil interference. This is from the video of the crank scope. The tall red lines are noise, and shouldn't be there.
Redo the crank scope with the HT leads and coil unplugged to eliminate that.

There's only so much we can do on a forum, and while stevie comes across as blunt, he is actually trying to help.

[Topgun]

Hello Alex
thank you for your reply. I appreciate there is only so much that can be done here ,,,but respectfully there is a way of doing it politely .
None of the ecu wiring has been touched since the car last ran with the engine in before I removed it to have it rebuilt, so I have no idea what could be causing the issue you describe above .
It is best I take the car to a specialist (it has to be rolling Rd set up anyway ) and I shall report back here with what was found to be wrong , it may be of help to someone else in the future .
thank you again

[stevieturbo]

There's little sarcasm, just stating facts.

As said, a proper scope trace would be more informative, but obviously not everyone has a scope.

I asked what type of crank sensor it is using, but no answer. VR is more susceptible to noise than Hall.....likewise importance of wiring varies between the two.

I asked to upload your map, to see if there was anything that looked out of place, no response.

It would be interesting to see a back to back of diagnostic screen during cranking when "bad" and when "good" with coil unplugged.
In your first video of similar, you seem to state it was a plugs in, and plugs out, but coil still plugged in ?

Have you tried with a better power source, whether booster pack, proper start charger ? ie because your cranking voltage is quite low. A recent 4cyl car I have done cranked at 10.5v, yours seemed to even dip into the 8's, although hard to see with the camera moving about.

And as you mention books, this isn't bad for a starting point.

[stevieturbo]

not sure why link isn't working

https://amzn.eu/d/1BkWdZC