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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > N54 engine problem helpp!!!



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      03-28-2012, 04:24 PM   #1
rstiv4200
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N54 engine problem helpp!!!

ok so something serious is going on very weird with my engine mods and specs are as follows 07 335i coupe jb3 raceland catless dps with dp fix afe dci magnaflow catback and thats it for now .....so heres whats going on i was driving on highway is 6th gear downshift to 5th cuz cop .....then punched 5th pretty hard and felt a vibration back on the gas petal so went into 6th and same thing service engine soon light came on and gas petal vibrated while driving along with whole engine it seemed like and my shift knob was shaking like crazy ...no problem shifting but extreme loss of power also ....the light went off after a day or so and was and has been coming back and forth randomly when in 5th and 6th .....i had 3 fuel pumps go on me and know what that feels like and i know its not that no smoke from turbos ....any ideas help please and thank you
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      03-28-2012, 06:56 PM   #2
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impossible to know without any kind of codes or anything. Any boost faults? vanos faults? how new are spark plugs? Ever had injectors or coils replaced? more info please..
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      03-28-2012, 07:10 PM   #3
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i did have new coil packs replaced as a recall about 4-6 months ago but no problems since ....spark plugs have never been changed to my knowledge the car has 40k on it ....but if it were spark plugs wouldnt i be misfiring? and yes bad boost leaks while light is on normal when it is off and idk about the other thing u said
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      03-28-2012, 11:12 PM   #4
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Change spark plugs. Same things happened to me when my plugs went bad. Having a tune kills your plugs fast.
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      03-29-2012, 12:17 PM   #5
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awsome thanks man hope this helps any specific plugs you would recomend?
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      03-31-2012, 06:39 PM   #6
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OEM plugs
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      04-01-2012, 12:04 PM   #7
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I would try replacing the 2 vacuum lines at top front of engine first. This is quick and easy to do. Here is the post (vacuum line fix - low boost, underboost, 30ff, wastegate rattle)
I told my SA and he thanked me. He said this fix has solved some recent intermitant problems on cars with over 40,000 mile.
I did it my self at a cost of $7.00 for the vacuum line.
Hemostats (Medical scissor like pliers)work best to remove old lines and install new ones. Im changing all others vacuum lines soon.
My car runs perfect my tuner is going back on soon now that i know this was the problem. Right now my boost will max out at 9.2 psi 0n 91 oct.
Good Luck
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      04-02-2012, 11:22 AM   #8
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thanks will give that a shot im gonna do spark plugs too cuz think there are about due anyway
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      07-26-2012, 08:02 AM   #9
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Were you able to resolve the issue?. I am having the same symptoms, but the light and the vibrating is not going away :-(
I pulled over and may have to get the car towed.
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      07-26-2012, 04:54 PM   #10
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Hi All, the dealer just called me and said that it is a bad injector and will be covered under CPO warranty.
Hopefully the car should be ready tomorrow.

I also have another issue and don't know what to do.
I have 60k miles and sill original brakes rear and front, but dealer refuses to change the brakes under the maintenance program since they are not fully warned yet. My program expires in about 6 months. How can I get this changed without the brake light on?
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      07-29-2012, 06:41 PM   #11
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sorry didnt reply yes i did oem spark plugs and injectors by warrenty and problem is 100% gone
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      07-30-2012, 05:17 PM   #12
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My car is tuned and I got lucky that the dealer did not say anything. I have stock intake but that is pretty much it...
they replaced one injector, one plug and the coil. The car actually runs a bit smoother than before so this could have been a problem for awhile...
Under hard accelerations, at times it would feel like it would skip a beat, now it is gone.

Thanks
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      07-30-2012, 11:38 PM   #13
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stop driving the car so dam hard
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      08-06-2012, 07:37 PM   #14
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Quote:
Originally Posted by dicostal View Post
Hi All, the dealer just called me and said that it is a
I have 60k miles and sill original brakes rear and front, but dealer refuses to change the brakes under the maintenance program since they are not fully warned yet. My program expires in about 6 months. How can I get this changed without the brake light on?
Are your brakes squealing, clunking, vibrating?
Any or all of these complaints can cause an early replacement.
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      08-07-2012, 10:27 AM   #15
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lol, I accelerate very hard, but I do not like braking as hard :-)
The brakes do sqeal every now and then... thanks for the tip...

however I am still having Fuel issues, i picked up the car and 3 days later same issue worst than ever, the car died on me, they fixed it, I had a fuel leak.

I picked up the car on my way to work same issue not as harsh, got check engine light, the car is still there right now...

I will summarize everything they did once I get the car running well.

Thanks
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