[haaken675]

Hey everyone. I am trying to go down the rabbit hole of diagnosing the superknock codes I have recently seen.

My car is a 2007 335i
Pure 600 turbos
brand new eldor coils
new two step colder ngk plugs
Twisted tuning tune (no revisions currently)

I am leaning towards the possibility of the injectors being bad and potentially causing this issue? I have a bit of an erratic idle, and the other day I saw a puff of smoke upon startup. I believe they are index 9's.

Could a leaky injector cause a lean scenario causing super knock codes to be thrown? I don't have a CEL, I only saw it when i checked codes the other day.

DME active codes -
2AAF - DME: Fuel pump, plausibility.

- DME shadow (inactive) codes -
29F4 - DME: Catalytic-converter conversion.
29F5 - DME: Catalytic-converter conversion 2.
2FCA Fuel high pressure bei Freigabe der Einspritzung
2FDA - Crankshaft sensor, signal: Missing.
2FDB - Crankshaft sensor, signal: Not plausible.
30EE - DME: Superknocking, cylinder 2.
30F2 - DME: Superknocking, cylinder 6.

[Dave92N54]

Well your shadow codes would indicate a lean condition due to a faulty HPFP.

What is rail pressure on startup? Can you take a log?

Why the crank sensor codes? A faulty injector won't cause those either.

I believe typically a leaky injector if it's bad enough for something like this to happen, will result in mixture control codes as well. Another thing, a leaky injector would imply it's supplying too much fuel, so would not result in a lean condition. A possibly clogged injector may.

[haaken675]

I haven't been able to find anything about the crank sensor codes when searching. They have been there since I have owned the car it would seem. And if i remember correctly the dealer info we pulled showed a new HPFP at some point in the past. I could have sworn that was a more common shadow code.

I'll have to take some logs. The problem is I barely drive the car and when I do its usually to the gym first thing in the morning and just forget. Will try and take one tomorrow.

[Quick335XI]

I’ve replaced all crank type sensors and have also gotten those from day one smh.

I’m also chasing down a superknocking issue can I ask you what noise it makes when the superknocking happens? When I get that code, it sounds like a fluttering or grinding sound.

[iqraceworks]

Also.....you could have a bad knock sensor. I was getting random knock codes in the morning on the way to work. Replaced both sensors....no issues for over a year now.

[Dave92N54]

Originally Posted by Quick335XI

I’ve replaced all crank type sensors and have also gotten those from day one smh.

I’m also chasing down a superknocking issue can I ask you what noise it makes when the superknocking happens? When I get that code, it sounds like a fluttering or grinding sound.

Iirc, you have a built motor don't you?

[Dave92N54]

Originally Posted by haaken675

I haven't been able to find anything about the crank sensor codes when searching. They have been there since I have owned the car it would seem.

I've heard sometimes MHD will trigger the missing code with no adverse symptoms but not both. Either way, I wouldn't accept it as normal. I, and many others here do not have those codes.

Originally Posted by haaken675

And if i remember correctly the dealer info we pulled showed a new HPFP at some point in the past. I could have sworn that was a more common shadow code.

The newer pumps are pretty reliable, so may not be the cause. I too have heard it's somewhat common of a shadow code but like the crankshaft position codes, I wouldn't accept it as normal. I have never once gotten any of these codes other than the shadow codes for the DPs.

Will wait for logs, should be pretty clear what system the issue may be from a cold start log, especially if that's when you say you're seeing smoke.

[iqraceworks]

Originally Posted by Quick335XI

I’ve replaced all crank type sensors and have also gotten those from day one smh.

I’m also chasing down a superknocking issue can I ask you what noise it makes when the superknocking happens? When I get that code, it sounds like a fluttering or grinding sound.

Have you replaced the knock sensors??

[haaken675]

Took a data log from a cold start this morning. Hadn't started the car in 2 days, so definitely a true cold start.
https://datazap.me/u/haaken675/idle-...16-17-21-22-26

Rail pressure looks good and consistent. The only thing that looked off to me is there seems to be some inconsistencies in the bank 2 AFR's. It seems to dip periodically, and saw a few spots in the 12's. I would assume this likely correlates with the stumble at idle. The timing seems to be all over the place as well? Not sure if this is normal or not. The "timing cyl. 1 *crk” seems to be fairly erratic, but i'm not exactly what it means, or if that is normal or not.

[iqraceworks]

Have you checked for leaky injectors?

[haaken675]

Originally Posted by iqraceworks

Have you checked for leaky injectors?

I've done a quick spot check, but haven't gone much further then that so far. I probably should pull the coil and plugs and check them as well but haven't had the opportunity yet.

[Quick335XI]

Originally Posted by Dave92N54

Iirc, you have a built motor don't you?

Yes. I haven’t replaced the knock sensors. The thing is… i DO hear a noise when it super knocks but I don’t know if it’s actual knock , or the car adjusting stuff etc. It sounds like a grinding or fluttering sound. I tried to take a video but it only happens sometimes and I doubt the sound would even come through, it’s not very loud.

Has anyone heard what superknock actually sounds like?!

[iqraceworks]

Originally Posted by haaken675

I've done a quick spot check, but haven't gone much further then that so far. I probably should pull the coil and plugs and check them as well but haven't had the opportunity yet.

What kind of "quick spot check" did you do if you didn't pull the plugs and check for fuel?

[haaken675]

Originally Posted by iqraceworks

What kind of "quick spot check" did you do if you didn't pull the plugs and check for fuel?

Literally just that. I pulled the engine cover and looked for a physical sign of a leak, smell of fuel, etc. As previously stated, I haven't had a chance to pull the plugs yet. Will see if I can find the time, but that likely won't be happening until after Christmas at this point.

[iqraceworks]

Originally Posted by haaken675

Literally just that. I pulled the engine cover and looked for a physical sign of a leak, smell of fuel, etc. As previously stated, I haven't had a chance to pull the plugs yet. Will see if I can find the time, but that likely won't be happening until after Christmas at this point.

Yeah.....they leak into the cylinders, not out the topside.

[haaken675]

Originally Posted by iqraceworks

Yeah.....they leak into the cylinders, not out the topside.

I assumed so, but you never know. My car has had literally everything go wrong with it that possibly could.

[_N54]

Built engines are known to be more noisy to the knock sensors according to BMS and VTT and cause false timing corrections. At first I was getting tuned by Wedge and I would get super knock faults especially when the car was cold driving off at the lower rpms, but when Justin V8Bait got back to me with his tunes and revisions, it never threw any super knock faults. I'm not sure if it's a coincidence or not, but might be tune related. If it's a true super knock faults that's usually not a good thing and also keep in mind a lot have been saying that a bunch of bad index 12's have been released. I guess a good way is to swap the injectors around and see if the super knock follows to that specific cylinder.

[iqraceworks]

Have you ran any logs to see what the fueling and timing is doing? Are you running abnormally high amounts of timing? Are your AFR's too lean? A log should provide all kinds of good info.

[haaken675]

Originally Posted by iqraceworks

Have you ran any logs to see what the fueling and timing is doing? Are you running abnormally high amounts of timing? Are your AFR's too lean? A log should provide all kinds of good info.

I drive the car like 3 miles a day to the gym and back on average. It barely gets to temp to do a proper pull, so no, I have not been able to take it out and try and replicate the scenario again. That being said, I didn't even know there was an issue until I decided to heck codes since I hadn't in a while. The only reason I have a timeframe where I think this occurred is because I thought to myself traction control had kicked in on the highway since it was damp out when i did get to drive the car on the highway last and did a 4th gear pull. I am trying to get an idea of what might be causing this to rectify without having to try and replicate and potentially hurt something.

[Quick335XI]

Originally Posted by _N54

Built engines are known to be more noisy to the knock sensors according to BMS and VTT and cause false timing corrections. At first I was getting tuned by Wedge and I would get super knock faults especially when the car was cold driving off at the lower rpms, but when Justin V8Bait got back to me with his tunes and revisions, it never threw any super knock faults. I'm not sure if it's a coincidence or not, but might be tune related. If it's a true super knock faults that's usually not a good thing and also keep in mind a lot have been saying that a bunch of bad index 12's have been released. I guess a good way is to swap the injectors around and see if the super knock follows to that specific cylinder.

Thanks for the reply. Yeah for a long time, for the same reason (built motor and race heads), I was also thinking false knock. HOwever, when i get that superknock, i can hear a grinding or "fluttering" type of sound just before it throws the error. Did you hear anything like that when yours did?

[_N54]

Originally Posted by Quick335XI

Thanks for the reply. Yeah for a long time, for the same reason (built motor and race heads), I was also thinking false knock. HOwever, when i get that superknock, i can hear a grinding or "fluttering" type of sound just before it throws the error. Did you hear anything like that when yours did?

I don't remember hearing anything, but all I know is the fan kicked on high when I got those fault codes.