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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > Loss of power on acceleration



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      09-13-2019, 06:01 PM   #1
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Loss of power on acceleration

I've got an issue that I can't seem to narrow down. i get a loss of power during moderate acceleration only on cold startup. It only occurs if the car has been sitting for hours, and it only occurs within the first 30 seconds of a cold start. After 30 seconds or so the issue stops.

It is most noticeable in 2nd gear. There are no codes. It feels similar to if DSC kicks in, but much less aggressive. Before I begin throwing money at an LPFP, HPFP and 6 injectors, does anyone know what this could be?
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      09-13-2019, 06:33 PM   #2
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Originally Posted by Welcome to NBA Jam View Post
I've got an issue that I can't seem to narrow down. i get a loss of power during moderate acceleration only on cold startup. It only occurs if the car has been sitting for hours, and it only occurs within the first 30 seconds of a cold start. After 30 seconds or so the issue stops.

It is most noticeable in 2nd gear. There are no codes. It feels similar to if DSC kicks in, but much less aggressive. Before I begin throwing money at an LPFP, HPFP and 6 injectors, does anyone know what this could be?
Just putting this out there, did you get to take a look at the boost numbers when this is occurring?
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      09-13-2019, 07:03 PM   #3
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So going WOT within 30 seconds after a cold start? Who would have thought that would cause an issue...
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      09-13-2019, 08:28 PM   #4
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Quote:
Originally Posted by TheGoodTheBadTheUgly View Post
Just putting this out there, did you get to take a look at the boost numbers when this is occurring?
I have not, but it's a good idea.

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Originally Posted by weehe126 View Post
So going WOT within 30 seconds after a cold start? Who would have thought that would cause an issue...
Which of these bolded words confused you in the sentence below?

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i get a loss of power during moderate acceleration only on cold startup.
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      09-13-2019, 11:16 PM   #5
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Well, enjoy your rod bearing failure.
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      09-13-2019, 11:25 PM   #6
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Is this something that you just started noticing? Because timing is pulled quite a bit when the engine is cold.

Or it could be related to valvetronic motor. But obviously best way to approach this is to log the car
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      09-14-2019, 07:30 AM   #7
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Is this something that you just started noticing? Because timing is pulled quite a bit when the engine is cold.

Or it could be related to valvetronic motor. But obviously best way to approach this is to log the car
This has been happening for about 8 months. I initially thought it was the clutch slipping as that was wearing out, but after replacing it and having it mate to the flywheel I have not seen an improvement during this scenario. I'll do some logs on fuel pressure, boost, etc. and see if there's anything weird.
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