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BMW 3-Series (E90 E92) Forum
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N54 wont idle
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09-21-2018, 12:37 AM | #1 |
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N54 wont idle
Hi everyone need a bit of help on what to do next on an n54 that in trying to fix. Tried researching but everyone else doesnt seem to have the same symptoms. The idle on this car is fine for a few seconds when cold, as soon as it begins to drop it begins to jump up and down it drops under 500rpm and alsmot stalls then jumps back up. It does this whether its cold or warm Ac on and off. Just bought the car. Put brand new spark plugs, brand new coils, all new vaccum lines, walnut blast, hpfp is new, swapped out injectors and coded with no change, cleaned the MAP sensors, cleaned the vanos solenoids, swapped boost solenoid. All with not much result . The car pulls hard and is good all stock. Stumped at this point. I attached a youtube video so you guys can see. Any help is appreciated!
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2008 E92 335i-MHD FBO-6MT Conversion- CIC I-drive Retrofit
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09-21-2018, 09:43 AM | #2 |
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i have same issue replaced the coils, plugs, and index 12 injectors just improved a little but issue still there.... what i did is used MHD to disable "cold start" and set idle to 800rpm... 2 years running no issues. u in san diego warm climate like me so u will be fine.
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09-21-2018, 10:16 AM | #3 | |
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09-21-2018, 11:08 AM | #6 |
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Drives: 2015 435i grand coupe xdrive
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yup I would guess vacuum leak
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2015 435i grand coupe xdrvie (current)
2006 F250 powerstoke CCSB (current) 2014 M235i Black on Red (SOLD) / 08 e90 335i MT Pure Stage 2 High flow (SOLD) 08 128i 6MT (SOLD) / 08 335i 6MT Pure stage 1 (SOLD) |
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09-21-2018, 04:34 PM | #7 |
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09-21-2018, 04:37 PM | #9 |
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