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      10-23-2014, 10:02 AM   #1
ChicagoBimmers
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HELP! n54 engine power loss

i have catless dp's, fmic, dci, and a jb4 on my 08 335xi. Recently ive been feeling some type of stutter when driving and the idle has been a little weird. For some reason Autozone and a shop i took my car to get the codes read and figure out what's wrong.. but no one has been able to read the codes?!?!? possibly because of the jb4??

Start up the car and it has quite a bit of white smoke (live in Chicago so its cold af). Smells like gas a lot more at start up too.. and gas mileage has been going down.

When i step on the gas i feel very little power almost like half the engine isnt working. When i gun it there is no doubt ill get a check engine light. not sure if its spark plugs? fuel injectors? fuel pump?

Also, i have catless dp's if that makes a difference? i do have the SES light on normally goes away if i do a code clear. i have had 1-2 experiences where it cleared for a couple days but came back.

if anyone has any experience with similar symptoms id grately appreciate the feedback.
Thanks
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      10-23-2014, 10:14 AM   #2
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Leaky injector maybe if you're getting fuel smell on startup, that'll also cause the driving issues. Any codes?
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      10-23-2014, 10:22 AM   #3
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You need to find someone with a real diagnostic tool for BMW's. Generic code readers can't always see the shadow codes.

Here is how to read codes on JB4 for the next time a CEL pops up .

The easiest method for beginners is to connect the laptop interface and use the "read codes" button as indicated in the image below. This will give a full listing along with descriptions. Alternatively for more advanced users or if a laptop isn't available you may use the in dash reading on menu 1 option 1.

You probably have a leaky injector and probably need to change your spark plugs too.

Pull your spark plugs and find one fouled with fuel, that is likely going to be hte injector that needs to be replaced.

You sometimes can't swap injectors without having a BMW diagnostic tool to code it in, so if you are not handing in this area or knowledgeable you should seek out a reputable BMW shop or BMW dealer.
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      10-23-2014, 10:28 AM   #4
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Leaky injector maybe if you're getting fuel smell on startup, that'll also cause the driving issues. Any codes?
Currently i have the BRAKE light on, SES, and when i step on it the CEL comes on.
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      10-23-2014, 10:31 AM   #5
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Originally Posted by Jeff@TopGearSolutions View Post
You need to find someone with a real diagnostic tool for BMW's. Generic code readers can't always see the shadow codes.

Here is how to read codes on JB4 for the next time a CEL pops up .

The easiest method for beginners is to connect the laptop interface and use the "read codes" button as indicated in the image below. This will give a full listing along with descriptions. Alternatively for more advanced users or if a laptop isn't available you may use the in dash reading on menu 1 option 1.

You probably have a leaky injector and probably need to change your spark plugs too.

Pull your spark plugs and find one fouled with fuel, that is likely going to be hte injector that needs to be replaced.

You sometimes can't swap injectors without having a BMW diagnostic tool to code it in, so if you are not handing in this area or knowledgeable you should seek out a reputable BMW shop or BMW dealer.
I took it to Fluid MotorUnion to get it checked and they said their bmw reader couldnt read any codes. they used another reader and said my o2 sensors need to be switched? probably were misplaced when putting the downpipes on? would that cause the power loss tho?
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      10-23-2014, 10:52 AM   #6
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Quote:
Originally Posted by ChicagoBimmers View Post
I took it to Fluid MotorUnion to get it checked and they said their bmw reader couldnt read any codes. they used another reader and said my o2 sensors need to be switched? probably were misplaced when putting the downpipes on? would that cause the power loss tho?
If your o2 sensors are in the wrong place that would definitely cause some problems.
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      10-23-2014, 11:00 AM   #7
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If your o2 sensors are in the wrong place that would definitely cause some problems.
A slew of problems, I'd bet that's what it is if they're switched around.
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      10-23-2014, 11:13 AM   #8
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Gray sensor goes on the short pipe (Rear Turbo), black sensor on the large pipe (Front Turbo).
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      10-23-2014, 12:03 PM   #9
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you need to be in map 0 for the obd port to work wtih a scanner.
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      10-23-2014, 12:26 PM   #10
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you need to be in map 0 for the obd port to work wtih a scanner.
I feel pretty dumb for not thinking of that... lmao im going to give it a try. thanks for the input guys
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      10-23-2014, 12:29 PM   #11
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Quote:
Originally Posted by Myrder View Post
you need to be in map 0 for the obd port to work wtih a scanner.
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Originally Posted by ChicagoBimmers View Post
I feel pretty dumb for not thinking of that... lmao im going to give it a try. thanks for the input guys
It slipped my mind also. Good catch MYRDER.
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      10-23-2014, 12:32 PM   #12
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It slipped my mind also. Good catch MYRDER.
Thanks! Only caught it because I do it every damn time to myself when flashing the car lol. Cue miniheartattack
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