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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E90/E91/E92/E93 (2006 - 2013)

E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 03-28-2013, 05:07 PM
Hemorrhage Hemorrhage is offline
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Correctly Testing A Component?

I'm trying to solve a misfire problem.

The misfire has no pattern. Every time it shoots an SES light, the cylinder(s) shown up on the scan tool differ.

It only "sputters" and misfires when it is above 160 degrees...meaning, the turbos put out more boost than when below 160 degrees.

...which makes me think something in the ignition system is failing due to high boost.

Either the HPFP can't keep up...the coils aren't firing, or the injectors or messed up.

How would you even diagnose this?

I don't want to throw money at it and hope it works...I want to correctly find the problem. However, I don't see how you could ohm check (or diagnose in general) a component that ONLY fails under high boost conditions.


The plugs were changed 5k miles ago, so...I don't think it's them...UNLESS NGK Platinums don't fit the vehicle's ignition system.
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  #2  
Old 03-29-2013, 03:45 AM
mr_bean mr_bean is offline
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Is the same cylinder misfiring every time?

Try swapping the coil with another cylinder and see if the problem follows it. Do the same with the spark plug. It's entirely possible you have a defective one.
Don't try this with the injectors.
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  #3  
Old 03-29-2013, 04:21 AM
Hemorrhage Hemorrhage is offline
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Quote:
Originally Posted by mr_bean View Post
Is the same cylinder misfiring every time?

Try swapping the coil with another cylinder and see if the problem follows it. Do the same with the spark plug. It's entirely possible you have a defective one.
Don't try this with the injectors.
It's not the same cylinder(s) every time, no.
Every time I pull the codes, the cylinder(s) that show up are always in a different pattern.
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  #4  
Old 03-29-2013, 05:30 AM
mr_bean mr_bean is offline
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What do you mean by "pattern"? Are all cylinders misfiring but the codes are in a different order?
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  #5  
Old 03-29-2013, 05:47 AM
Hemorrhage Hemorrhage is offline
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Sometimes it'll just say cyl 1.
Sometimes it'll say cyl 1, 6, 5.
Sometimes it'll say just cyl 2.
Sometimes it'll say cyl 1, 2, 3.
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  #6  
Old 03-29-2013, 06:31 AM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by Hemorrhage View Post
I'm trying to solve a misfire problem.

The misfire has no pattern. Every time it shoots an SES light, the cylinder(s) shown up on the scan tool differ.

It only "sputters" and misfires when it is above 160 degrees...meaning, the turbos put out more boost than when below 160 degrees.

Name:  Think 02.gif
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What scan tool are you using?

What codes show?

Mileage?
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  #7  
Old 03-29-2013, 06:50 AM
Hemorrhage Hemorrhage is offline
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Miles - 75k. The problem started around 69k when I put a tune on the car.

I'm using a BTech I bought off Terry.

As for the codes...I'll have to write them down next time I put the scan tool on it.
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  #8  
Old 03-29-2013, 07:19 AM
mr_bean mr_bean is offline
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Quote:
Originally Posted by Hemorrhage View Post
The problem started around 69k when I put a tune on the car.
There's your problem.
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  #9  
Old 03-29-2013, 08:56 AM
Hemorrhage Hemorrhage is offline
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Still acting up after removing the tune.
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  #10  
Old 03-29-2013, 12:17 PM
mr_bean mr_bean is offline
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What, exactly, were the parts that were changed out?
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  #11  
Old 03-29-2013, 12:59 PM
Hemorrhage Hemorrhage is offline
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All of the spark plugs, and one coil.
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  #12  
Old 03-29-2013, 01:14 PM
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DSXMachina DSXMachina is offline
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Those NGK plugs are probably your problem. Be absolutely certain they are the correct part number or buy them from BMW. The N54 is extremely sensitive to plug type and "almost" isn't close enough.
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  #13  
Old 03-29-2013, 03:20 PM
Hemorrhage Hemorrhage is offline
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I kind of think it's them too. Not sure, though.

It still did it when I had the old, OEM plugs in it. However...those plugs had 70k miles on them. So, I don't know.
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  #14  
Old 03-29-2013, 04:40 PM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by Hemorrhage View Post
Miles - 75k. The problem started around 69k when I put a tune on the car.

I'm using a BTech I bought off Terry.

As for the codes...I'll have to write them down next time I put the scan tool on it.

A sumptuous number of miles, it must be said.

Got Coke?
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  #15  
Old 03-29-2013, 04:42 PM
Hemorrhage Hemorrhage is offline
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I just cleaned my valves last Sunday with carb cleaner and rags. The problem is still as bad as ever.
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  #16  
Old 03-29-2013, 07:51 PM
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Quote:
Originally Posted by Hemorrhage View Post
I just cleaned my valves last Sunday with carb cleaner and rags. The problem is still as bad as ever.

Dang, boy. First I've heard of any prob w/Terry's tunes....or are you using some kinda almost-Terry like Cobb or >GASP< Dinan?

'Course, Terry's tune prob just accentuated what was already happening.

Interested to see what codes show up!
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  #17  
Old 03-30-2013, 06:12 AM
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DSXMachina DSXMachina is offline
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Quote:
Originally Posted by Hemorrhage View Post
I kind of think it's them too. Not sure, though.

It still did it when I had the old, OEM plugs in it. However...those plugs had 70k miles on them. So, I don't know.
You had 70K on the original plugs?
It's Saturday, go buy the right plugs and install them before going further. Be sure to reattach any ground straps you disconnect to pull the coils.
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  #18  
Old 03-30-2013, 03:31 PM
Hemorrhage Hemorrhage is offline
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I more than likely will change them.

Still would like to discuss some other possibilities, though.

A tech at my shop thinks it is a fuel issue.

If you push the throttle down far enough, it'll sputter. If you let off the gas and press the pedal again, it'll accelerate smoothly for a few sec. and then start sputtering again.

The tech at my shop thinks this is because it's not providing fuel fast enough. He said the reason it'll accelerate smoothly for a second or two is because you're allowing it to catch up.

Another thing...
If you put it in park and smash the throttle down, it won't do it. Only when moving the vehicle it'll do it.
So, I don't know what that could mean.
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  #19  
Old 03-30-2013, 03:34 PM
Hemorrhage Hemorrhage is offline
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Quote:
Originally Posted by CALWATERBOY View Post
Dang, boy. First I've heard of any prob w/Terry's tunes....or are you using some kinda almost-Terry like Cobb or >GASP< Dinan?

'Course, Terry's tune prob just accentuated what was already happening.

Interested to see what codes show up!
I don't blame his tune. I blame the higher boost causing a weak component to fail even further.
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  #20  
Old 03-31-2013, 04:38 PM
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Orient330iNYC Orient330iNYC is online now
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Quote:
Originally Posted by Hemorrhage View Post
I just cleaned my valves last Sunday with carb cleaner and rags. The problem is still as bad as ever.
how did you clean your valves with just rags and carb cleaner?
you didnt need to use brushes, etc?
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Last edited by Orient330iNYC; 03-31-2013 at 04:40 PM.
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  #21  
Old 03-31-2013, 04:40 PM
Hemorrhage Hemorrhage is offline
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All I had was like...a paint brush.

So, I ended up wrapping a screwdriver inside of a rag to get the heavy stuff off.
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  #22  
Old 03-31-2013, 05:04 PM
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Orient330iNYC Orient330iNYC is online now
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were your injectors changed at any point?
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  #23  
Old 03-31-2013, 05:07 PM
Hemorrhage Hemorrhage is offline
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Not that I know of.
I just wish I could figure out for sure it's them rather than just buy 6 injectors and hope it gets fixed.
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  #24  
Old 03-31-2013, 05:30 PM
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Orient330iNYC Orient330iNYC is online now
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can you try resetting the DME adaptations with your bav technic cable and see if you have the issue the first drive after you do the reset?
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Past: 2007 335i 6MT ZSP/ZCW/322/655
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  #25  
Old 03-31-2013, 05:31 PM
Hemorrhage Hemorrhage is offline
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What would that do, exactly?
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