[adioman6000]

Getting a persistent misfire on cylinder 6. I have changed the plugs, coils, and injectors on all the cylinders. The injectors were coded correctly and I installed new decouplers. HPFP and carbon clean were taken care of as well. I have a really rough cold start with rough idle after until the car is warmed up. The idle after the car is warm is low, it is around 550 rpms unless I have the AC on. Any input on these issues?

[Digitalism]

I have been having the same issues but have not replaced my leaky injector. I diagnosed the injector purely by replacing the plugs and plug 6 was drenched in fuel.
This is not your case since you have replaced all the injectors.

[Welterweight]

Have you tried cleaning and switching the solenoids? Oil change?

[adioman6000]

Originally Posted by Welterweight

Have you tried cleaning and switching the solenoids? Oil change?

Fresh oem oil change and I cleaned the solenoids a few months ago. There are no vanos specific codes.

[Jeff@TopGearSolutions]

Out of curiosity, I would look at the plug on cylinder 6. I know you replaced the injector and plugs but that doesn't mean the injector couldn't be defective.

Also crack in the valve cover or a leaky valve cover gasket can be the culprit too.

[adioman6000]

Originally Posted by Jeff@TopGearSolutions

Out of curiosity, I would look at the plug on cylinder 6. I know you replaced the injector and plugs but that doesn't mean the injector couldn't be defective.

Also crack in the valve cover or a leaky valve cover gasket can be the culprit too.

I have pulled the plugs and they look clean. I replaced the VCG a couple of weeks ago and I did not notice any cracks and there isn't any oil leaking so I think the install was fine. This issues started happening after I cleaned the valves, but I did not run into any issues putting the car back together.

Could a bad TMAP sensor cause this?

[Jeff@TopGearSolutions]

Originally Posted by adioman6000

I have pulled the plugs and they look clean. I replaced the VCG a couple of weeks ago and I did not notice any cracks and there isn't any oil leaking so I think the install was fine.

Could a bad TMAP sensor cause this?

Hmm, they usually don't go bad unless they were beaten up during install or something. You could pull it out and clean that for peace of mind. Otherwise I'm a little stumped. I've ready before of a few hiccups after a walnut blast but I can't recall off the top of my head what the fixes were.

[adioman6000]

Yeah, I am really confused on to what is going on. I had 29d2, 29d0, and 29cc after I cleaned the valves, so I changed the plugs and injectors and the car was fine for a couple of days and now I have 29d2 again and rough starts.
Car pulls hard when I give it the beans. I am getting an abnormally loud injector tick on injector 3 but no codes specific for that cylinder.

[Eurocraze]

mods? i have a similiar issue, idels at 600 until warm then it stays a bit over 700 when warm. i can feel misfires when its warming up, but stops once its warm, i got no CEL or anything for it...

[adioman6000]

Just DCI, Alpina flash, and BMW PPK tune.

[Jeff@TopGearSolutions]

Originally Posted by adioman6000

Yeah, I am really confused on to what is going on. I had 29d2, 29d0, and 29cc after I cleaned the valves, so I changed the plugs and injectors and the car was fine for a couple of days and now I have 29d2 again and rough starts.
Car pulls hard when I give it the beans. I am getting an abnormally loud injector tick on injector 3 but no codes specific for that cylinder.

Any mods and what kind of tune?

Edit- I see you just replied, hmm

Do you have a BT Tool?

Originally Posted by Eurocraze

mods? i have a similiar issue, idels at 600 until warm then it stays a bit over 700 when warm. i can feel misfires when its warming up, but stops once its warm, i got no CEL or anything for it...

A little roughness at idle during cold start is kind of normal for this platform.

Have you fresh spark plugs, good coils and injectors not leaking?

[adioman6000]

Yes I have the BT cable.

[Jeff@TopGearSolutions]

Originally Posted by adioman6000

Yes I have the BT cable.

Have you tried resetting adaptations in all the areas. You may have to reset everything twice. I'm curious if that will work out.

Lastly, are you using OEM bosch spark plugs or NGK?

[adioman6000]

Originally Posted by Jeff@TopGearSolutions

Have you tried resetting adaptations in all the areas. You may have to reset everything twice. I'm curious if that will work out.

Lastly, are you using OEM bosch spark plugs or NGK?

I had factory plugs before I changed to the Bosch oem ones, I switched back to the old factory ones to see if that would help but there is no change. I have reset the adaptation with the car running, should I go through and reset everything with the car off?

[Welterweight]

How do you reset adaptations????

I just replaced plugs, coils and injectors....Thanks

[adioman6000]

Originally Posted by Welterweight

How do you reset adaptations????

I just replaced plugs, coils and injectors....Thanks

You need a BT cable or equivalent

[adioman6000]

Anyone know the symptoms of a cracked valve cover? I have a slight burning smell at idle coming from the engine bay, but I can not see any visible cracks.

[Eurocraze]

rough idle is a sign, but hard to tell without hearing or seeing, cause it could be a misfire, could be a timing. looking at the rpm description you gave, i want to venture and say solenoids are bad/going bad. did you try swapping them around? i had a solenoid damn near fail on me, i swapped them around and the car ran a bit better, but eventually starting acting up again. on the sidenote though, yours is cylincer specific... so, even a cracked valve cover/gasket, i would think would effect all cylinders...

[Jeff@TopGearSolutions]

Originally Posted by adioman6000

I had factory plugs before I changed to the Bosch oem ones, I switched back to the old factory ones to see if that would help but there is no change. I have reset the adaptation with the car running, should I go through and reset everything with the car off?

I usually did it with the car off so it didn't freak out.

[Eurocraze]

Originally Posted by Jeff@TopGearSolutions

A little roughness at idle during cold start is kind of normal for this platform.

Have you fresh spark plugs, good coils and injectors not leaking?

well, i have fresh sparks (oem bosch) with about 1200 miles on them, new vanos solenoids, bout 1k miles on, and oem bosch coil packs, about 4k on them. as far as the injectors, i have no idea if they are leaking or are going bad..? this morning was another rough start, she sounded like dog shit, and sputtered a lil bit.. turned the car off, back on, and all was good. this was a more than a lil rough idling i assure you lol.

mods are DCI, downpipes, and jb3

[GoRomeo]

Originally Posted by adioman6000

Getting a persistent misfire on cylinder 6. I have changed the plugs, coils, and injectors on all the cylinders. The injectors were coded correctly and I installed new decouplers. HPFP and carbon clean were taken care of as well. I have a really rough cold start with rough idle after until the car is warmed up. The idle after the car is warm is low, it is around 550 rpms unless I have the AC on. Any input on these issues?

Check for vacuum leaks too.

[Eurocraze]

GoRomeo has a good point.. OP do you have a boost gauge? check and see if your hitting marks with boost/vacuum.

and maybe check your t-taps if you do? idk... jus shooting ideas