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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > When is it going to stop?!



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      11-18-2016, 07:54 PM   #1
Tkam07
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I have a 2007 335i, I love the car but it's a full time job diagnosing and fixing this thing. I just changed the hpfp because the car would automatically default to the lpfp when started. So i figured I'll also change the spark plugs and intake manifold gasket along with it. That fixed the issue but now I have a rough idle, misfire on cylinder 1. I just swapped the coils and still my car misfires. I disconnected the coils with the car running and noticed it makes no difference whether cylinder one coil is connected or disconnected.
Any idea what it could be?
Btw, the car runs great full or part throttle but just shakes bad when idling.
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      11-18-2016, 08:19 PM   #2
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does it shake a lot on cold starts? and have you notices any white smoke from the tail pipes?
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      11-18-2016, 09:13 PM   #3
Tkam07
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Quote:
Originally Posted by DE92an View Post
does it shake a lot on cold starts? and have you notices any white smoke from the tail pipes?
It shakes whether cold or hot. It's a vibration. I haven't looked at the tailpipe for smoke. But whether the Ignition coil is plugged in or not, it doesn't make a difference at idle, it still shakes. Runs great when WOT.
What are you thinking it could be?
I'm think injector stuck open??
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      11-18-2016, 11:33 PM   #4
Chris@VargasTurboTech
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It's not going to stop -learn to deal with the BMW gremlins (embrace them even!) and drive the snot out of it to make sure you get your enjoyment's worth.

Logs will tell you what's up with your misfire/etc.
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      11-19-2016, 01:32 AM   #5
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Quote:
Originally Posted by Tkam07
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Originally Posted by DE92an View Post
does it shake a lot on cold starts? and have you notices any white smoke from the tail pipes?
It shakes whether cold or hot. It's a vibration. I haven't looked at the tailpipe for smoke. But whether the Ignition coil is plugged in or not, it doesn't make a difference at idle, it still shakes. Runs great when WOT.
What are you thinking it could be?
I'm think injector stuck open??
im thininkg a bad injector, to check for stuck injectors log your lambda 1 and 2, drive your car and log let off the gas drive a bit let off and see if your banks go to 235 they should both go to 235 everytime (closed)
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      11-19-2016, 04:45 AM   #6
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stock plugs? or ngk? you need to log

try swapping plugs from one cyl to another
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      11-19-2016, 05:44 AM   #7
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I chased this a long time and changed out a lot of parts. It can be related to al lot of things but what made the biggest difference for me was putting in ngk plugs gapped to 0.22. You can also try changing vacuum hoses, coils, vanos solenoids, injectors, do a wallnutblast. I did all of this and more, I would say start with the cheapest option
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      11-19-2016, 08:42 AM   #8
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Quote:
Originally Posted by titium View Post
stock plugs? or ngk? you need to log

try swapping plugs from one cyl to another
I have Bosch plugs. I ordered another index 10 injector which matches my current set, not sure if it'll help but worth a shot. I'll also try and switch the plugs and see if that helps. Thx fellas. Any other ideas, please chime in.
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      11-19-2016, 09:32 AM   #9
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It Never Stops. Trust Me.
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      11-19-2016, 03:17 PM   #10
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Quote:
Originally Posted by Chris@VargasTurboTech View Post
It's not going to stop -learn to deal with the BMW gremlins (embrace them even!) and drive the snot out of it to make sure you get your enjoyment's worth.

Logs will tell you what's up with your misfire/etc.
best advice there is. If you wanna cruise around slow for fear of breaking something, get a 328i or a lexus! At least the N54 motor is stout, even if everything around it is a ticking repair bill or at least parts bill lol

But, are you only getting the code for cylinder 1? if you pull the plug is it wet? My misfire issue turned out to be my mosfets, which took out a brand new ignition coil when they went. Also, what about walnut blasting?

Lastly, this is a stupid one, but I've done it and seen other people do it, when you did plugs, did you push the coil packs all the way down onto the plugs firmly enough? besides this, loggity log log it and see what's going on
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Last edited by YoungBlood; 11-19-2016 at 03:22 PM.
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      11-19-2016, 07:34 PM   #11
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Gentleman, first and foremost - I want to thank you all for joining me in my misery while I diagnosed this. I am glad to report it is over! For now at least.
I took spark plug #1 off just now and discovered one of the tips was touching/ in contact with the center. Essentially it wasn't gapped. I missed it when I originally put them in last week. But I pried it back and it's running mint now. Ohhhhh, what a relief. I've got 182k on this thing and it's been through a lot. Now I'm contemplating if it's time to part ways but for some reason I don't think I'm going to.
Thanks again fellas!
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      11-20-2016, 04:10 AM   #12
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It's a great feeling when you fix something that doesn't end up costing an arm and a leg.
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      11-20-2016, 07:56 AM   #13
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Originally Posted by vbp6us View Post
It's a great feeling when you fix something that doesn't end up costing an arm and a leg.
That feeling only lasted a couple of hours. Just got in the car and a "low coolant" light welcomed me this morning.
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      11-20-2016, 11:14 AM   #14
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That feeling only lasted a couple of hours. Just got in the car and a "low coolant" light welcomed me this morning.
LOL, that's the bimmer way!
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      11-20-2016, 11:29 AM   #15
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Misfire

I'll give you my two cents. Compression test first. Maybe the fuel filter just pre of the HPFP. Could be that pressure comes up high enough at part throttle to flow. Also cylinder 1 and 6 are your first to starve just by location. Not claiming I know anything but may give some things to mark off the list. Good luck, been there
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      11-20-2016, 12:12 PM   #16
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Quote:
Originally Posted by Chris@VargasTurboTech View Post
It's not going to stop -learn to deal with the BMW gremlins (embrace them even!) and drive the snot out of it to make sure you get your enjoyment's worth.

Logs will tell you what's up with your misfire/etc.
This is my philosophy. I also have an '07. If it gives me trouble, I just floor it, if the problem is still there, I look on here and do the fix.
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      11-20-2016, 04:34 PM   #17
Tkam07
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Quote:
Originally Posted by Glennyd View Post
I'll give you my two cents. Compression test first. Maybe the fuel filter just pre of the HPFP. Could be that pressure comes up high enough at part throttle to flow. Also cylinder 1 and 6 are your first to starve just by location. Not claiming I know anything but may give some things to mark off the list. Good luck, been there
I fixed the issue, it's a bad spark plug that I overlooked when installed last week, it wasn't gapped at all. There was zero gap between the tapered tip and the center electrode. I pried it back and it runs smooth now. Thx for the advice though...
Now I have to figure out what is this low coolant issue.
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      11-20-2016, 04:35 PM   #18
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Quote:
Originally Posted by JustDriveIt View Post
Quote:
Originally Posted by Chris@VargasTurboTech View Post
It's not going to stop -learn to deal with the BMW gremlins (embrace them even!) and drive the snot out of it to make sure you get your enjoyment's worth.

Logs will tell you what's up with your misfire/etc.
This is my philosophy. I also have an '07. If it gives me trouble, I just floor it, if the problem is still there, I look on here and do the fix.
Depending on issue I do that too sometimes.
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      11-23-2016, 11:40 PM   #19
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For the low coolant, I had to refill the tank with distilled water a few times over 2wks before the leak became more apparent. It could have been from a dozen places, but mine was a crack in the plastic part of the radiator. I took the opportunity to replace all coolant lines and upgrade to a CSF all aluminum unit.
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      11-24-2016, 12:04 AM   #20
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Quote:
Originally Posted by limitdown View Post
For the low coolant, I had to refill the tank with distilled water a few times over 2wks before the leak became more apparent. It could have been from a dozen places, but mine was a crack in the plastic part of the radiator. I took the opportunity to replace all coolant lines and upgrade to a CSF all aluminum unit.
Thx, I appreciate the advice. I did some miscellaneous work today like my windshield washer pump, pump filter, l brake pad sensors and reset the service. I also put the stock air box back in.
As far as the coolant, I believe it is related to a loose hose fitting. I had this issue last year, I'll have a mechanic look at it Friday. Car runs great, very happy. At this point I think I'll just baby it till the wheels fall off. It's in good shape with navi & mtech package but it's got 182k, I can't imagine it be worth much.
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      11-27-2016, 09:10 PM   #21
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"I can't imagine it be worth much."

At 182K I can't imagine how many parts have been replaced.
At 90K I'm like...."I'm outta here"
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      11-27-2016, 09:16 PM   #22
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Originally Posted by 3.1L Z View Post
"I can't imagine it be worth much."

At 182K I can't imagine how many parts have been replaced.
At 90K I'm like...."I'm outta here"
I've made a list of how much I've spent in the past 4 years and it's over $6k(including tires) just for stuff that broke...ooo and that "low coolant" light is due to my water pump leaking which was just replaced in April of 2015 with a Siemens/vdo/Continental unit! But wait! There's more!!!! Just yesterday my CCC head unit gave out and my Idrive screen keeps rebooting with just the BMW logo.
I hope someone is having a good laugh on my expense
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