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      05-13-2021, 03:59 PM   #1
F15x550icaliboy
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Cold start startup rough

2014 BMW X5 50i n63tu replaced coils, plugs 1 step colder ngk iridium, replaced both hpfp less than 1,000 miles. Noticed lately my cold start runs a little rough and I hear a slight wouldn’t call it a whistle but air blowing or sucking for a second or two. Idles a little off during it the cold start. And if I drive it after there seems to be a very low rpm stutter almost like a hesitation. Anyone have any ideas???
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      05-13-2021, 04:42 PM   #2
devlinsky
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Check your vac lines for starters.
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      05-14-2021, 02:59 AM   #3
F15x550icaliboy
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I’m gonna see if any local shops do a smoke test so I can figure this out. Also very low rpms I get a rattle/metal sound from the drivers side that I also noticed, any idea?
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      05-17-2021, 02:14 AM   #4
cbarden
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Don't forget to check your plugs also.
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      05-17-2021, 10:33 AM   #5
M302_imola
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Exhaust leak leading to a boost leak?
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      05-19-2021, 12:54 AM   #6
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Quote:
Originally Posted by F15x550icaliboy View Post
2014 BMW X5 50i n63tu replaced coils, plugs 1 step colder ngk iridium, replaced both hpfp less than 1,000 miles. Noticed lately my cold start runs a little rough and I hear a slight wouldn't call it a whistle but air blowing or sucking for a second or two. Idles a little off during it the cold start. And if I drive it after there seems to be a very low rpm stutter almost like a hesitation. Anyone have any ideas???
Fuel injectors.. I just had to get mine changed. I was getting misfires though. The good news is that if it is they're covered under extended warranty.

I also had some low speed shudder because of the Tcase. Dealer blamed my 22s but a fluid change got rid of it.
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      05-19-2021, 07:05 AM   #7
ooshnoo
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Clean the throttlebody
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