really weird issue

[ThatOneEuroE30]

Got the ground straps and dme. Will get them on tomorrow and see what happens

[ThatOneEuroE30]

lol

Yeah, a gutted cat and leaks would probably do it. Also, yes, welding while laying under a car sucks. There are a few slag holes burned in my coveralls which are reminders of how much I dislike having slag land on me.

When are you receiving that eBay DME?

I have been dealing with some vertigo so haven’t fixed the spots on car yet cause laying down triggers it most the time. hopefully it sounds better when i get it fixed. My dme and ground straps are out for delivery.

[bmwman91]

Could it be from the cat being gutted and and an exhaust leak. I gotta fix some of the welds. Gravity is a bitch to weld with.

lol

Yeah, a gutted cat and leaks would probably do it. Also, yes, welding while laying under a car sucks. There are a few slag holes burned in my coveralls which are reminders of how much I dislike having slag land on me.

When are you receiving that eBay DME?

[ThatOneEuroE30]

I do not see anything out of the ordinary in those videos. It is probably just the phone/youtube audio, but the exhaust note sort of sounds like the result of improper timing. I know you checked it (probably multiple times), so it is not likely to be the cams, and if they are off by more than ~10 degrees you will have pistons hitting valves. Still, something about how it sounds when running seems off.

Could it be from the cat being gutted and and an exhaust leak. I gotta fix some of the welds. Gravity is a bitch to weld with.

[bmwman91]

I do not see anything out of the ordinary in those videos. It is probably just the phone/youtube audio, but the exhaust note sort of sounds like the result of improper timing. I know you checked it (probably multiple times), so it is not likely to be the cams, and if they are off by more than ~10 degrees you will have pistons hitting valves. Still, something about how it sounds when running seems off.

[ThatOneEuroE30]

Video is pretty hard to read, what about those datalogs?

I cant save data logs with this scope just save screen shots.

[squidmaster]

Video is pretty hard to read, what about those datalogs?

[ThatOneEuroE30]

Scope video

https://youtu.be/KOFnFBGnEfo

https://youtu.be/mnUXFsVNpPc

[ThatOneEuroE30]

Gonna get a video of it set up correctly and post it to see how often the “missing tooth” happens

[squidmaster]

If you bought the scope you linked to on the last page then it can export to a datalog file. That would be much better than a video or screenshots

[ThatOneEuroE30]

Gonna get a video of it set up correctly and post it to see how often the “missing tooth” happens

[squidmaster]

everything is made up

[bmwman91]

Ha yeah, I just make stuff up. I AM PROFESSOR CHAOS!

[squidmaster]

Also I wouldn't listen to this "bmwman91" dork, he has no idea what he's talking about, total court jester probably doesn't even own a bmw ;)

[squidmaster]

It's just the missing tooth. Usually you'll see the sqr wave drop low for one extra:


or the sine wave will do this:

https://www.picoauto.com/library/automotive-guided-tests/crankshaft-inductive-floating-running

Well... how often do you see that crank sensor fault? If it's more than once a revolution, it could be dropped signal. It's normal for there to be the occasional lost phase, but if you're loosing sync often it can be caused by an out of spec/bad sensor, or a fault in the wiring that either alters the resistance or drops the signal altogether.

The ECU has a sampling time of a few milliseconds that is usually able to take care of any stutters.