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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > Mechanical Maintenance and TSBs: Break-in / Oil & Fluids / Servicing / TSBs and Service Bulletin > Low rpm Idle "Dipping"
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      05-12-2018, 04:49 AM   #1
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Low rpm Idle "Dipping"

Hey everyone, since I have installed docrace top mount on my 335i (f30) I have noticed my car rpm dips below 660rpms instead of sitting at 660rpm when coming to a stop without being in gear, when revving the engine [used to stall engine.], or when going from D to R it dips below, Also sometimes it also dips when car changes from 2nd gear to 1st gear when am stopping for a bump or something it quickly shifts to 1st and goes very low rpm one time it also stalled.

So I have noticed when it's on load (in gear) it helps that it won't stall. I have MAF sensor disconnected. and ran MAFless tune since yesterday, but it doesn't help. spark plugs were changed still same issues.

fyi the car runs great at WOT, it only suffers at idle.

I almost can say there is something wrong on the hardware side, but I have been trying to figure it out before going into an indy.

Thanks for reading, will appreciate any realistic idea
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      05-12-2018, 09:35 AM   #2
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Update: I just came back from the indy and he said there is nothing wrong (20mins inspection) I also have no codes related to issue.
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      05-15-2018, 04:07 AM   #3
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I forgot to add that it happens more frequently when I park inclined engine being higher than rear end.

It just happened and i have more than half tank. And i think it occured with almost full tank, so not sure whats wrong.
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      06-15-2018, 05:11 AM   #4
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I wanted to update the thread with some logs showing a symptom while driving other than revving at idle, see pedal input vs throttle output. [in attached pics]

I've ordered a used TB from UK, couldn't find one locally. new TB costs around 500$, ebay list used from 100$-50$.

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      06-15-2018, 11:20 AM   #5
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Quote:
Originally Posted by M-terkait View Post
Hey everyone, since I have installed docrace top mount on my 335i (f30) I have noticed my car rpm dips below 660rpms instead of sitting at 660rpm when coming to a stop without being in gear, when revving the engine [used to stall engine.], or when going from D to R it dips below, Also sometimes it also dips when car changes from 2nd gear to 1st gear when am stopping for a bump or something it quickly shifts to 1st and goes very low rpm one time it also stalled.

So I have noticed when it's on load (in gear) it helps that it won't stall. I have MAF sensor disconnected. and ran MAFless tune since yesterday, but it doesn't help. spark plugs were changed still same issues.

fyi the car runs great at WOT, it only suffers at idle.

I almost can say there is something wrong on the hardware side, but I have been trying to figure it out before going into an indy.

Thanks for reading, will appreciate any realistic idea
You might have better luck getting a response by posting in the "N55 Turbo engine Drivetrain/Exhaust Modifications" Sub-thread for F30s... I've noticed that more people use that section..
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      06-15-2018, 11:47 AM   #6
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@M-terkait, would love to see a picture of this install. I want to see how you can fit the turbo in that small space with filter. Did you also cut into the engine cover?
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      06-15-2018, 12:01 PM   #7
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Quote:
Originally Posted by _bdiddyb_ View Post
@M-terkait, would love to see a picture of this install. I want to see how you can fit the turbo in that small space with filter. Did you also cut into the engine cover?
I never ran engine cover. pic of it
https://www.instagram.com/p/Bi4P2gDn...n-by=m_terkait

bad news my 2nd water pump went out today, .
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