Rough idle engine shaking after car is warm

Beasty_916 · 08-10-2021, 12:51 PM

Quote:

Originally Posted by thejeremyman9

Well you can see some strange behavior but unfortunately I am just not sure how to interpret the carly parameters or how to pinpoint what might be wrong.

You are still getting no codes, even shadow codes? I think MHD lets you scan for codes for free via their app, you might try that.

Without any codes or anything remote diagnosis may not be possible.

Still no codes I ran the scanning tool and its the sames codes as before. I think I might have to buy the bm700 scanning tool for more in depth analysis or just take it to BMW. My SA said diag is $210

my ignition coils come in next week if that doesnt help I guess ill just take it to the dealership instead of throwing random parts at it.

Beasty_916 · 08-19-2021, 09:06 PM

Changed ignition coils and sparks No change. Where would I start next? Still no codes.

thejeremyman9 · 08-20-2021, 02:46 PM

Wait until a code comes up or continue throwing parts at it... fueling issue would be the next guess... injectors, etc, but again just a guess.

BMWILUVU · 08-20-2021, 09:43 PM

Quote:

Originally Posted by Beasty_916

Changed ignition coils and sparks No change. Where would I start next? Still no codes.

I think your upstream O2 is on the way out. You can inspect & clean it then reinstall and check results.
What do your exhaust tips look like? Overly or quickly sooted?

jgoens · 08-21-2021, 09:23 AM

You might consider installing ISTA on a computer and hooking it up--I have had instances where it gave more info than phone apps.

KeatonK · 08-27-2021, 01:24 PM

I have had this problem with my car for years. Only does it when its warm and parked for a little bit. If I rev it up a bit totally gone! If you find the issue please post it!

Beasty_916 · 09-15-2021, 09:02 AM

I decided to lift my car and check the charge pipe again and I found the 2 bung holes with no screws on the bottom of the pipe. I think the screws fell out when driving which was causing a boost leak and probably giving faulty readings to the MAF causing the revving. I closed both of the holes with screws from Home Depot with basic 1/8 NPT thread and loctite So far it’s been 2 weeks since the revving has stopped so hopefully that was the only issue.

Slo_F80_Mike · 11-07-2021, 11:35 PM

Turns out it was just a boost leak caused by the VRSF charge pipe from the bung hole. The screw plug had fallen out on one hole, other one was quite loose. Got a new plug for the first hole and added some loctite and took the original screw out of second hole and added loctite and tightened that as well.

catalin199522 · 02-15-2024, 02:10 AM

Quote:

Originally Posted by KeatonK

I have had this problem with my car for years. Only does it when its warm and parked for a little bit. If I rev it up a bit totally gone! If you find the issue please post it!

Did resolve the problem with this? i have the same issue

n55david · 02-15-2024, 11:31 AM

Quote:

Originally Posted by catalin199522

Did resolve the problem with this? i have the same issue

Leaking chargepipe.

08-19-2021, 09:06 PM	#24
Beasty_916 New Member 4 Rep 15 Posts Drives: Bmw 435i Join Date: Aug 2021 Location: Sacramento iTrader: (0)	Changed ignition coils and sparks No change. Where would I start next? Still no codes.
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08-20-2021, 02:46 PM	#25
thejeremyman9 Major General 4364 Rep 7,607 Posts Drives: 2015 BMW 335i Join Date: May 2019 Location: Cali iTrader: (0)	Wait until a code comes up or continue throwing parts at it... fueling issue would be the next guess... injectors, etc, but again just a guess.
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08-21-2021, 09:23 AM	#27
jgoens Major General 3788 Rep 5,776 Posts Drives: 2013 335i msport Join Date: Nov 2014 Location: San Mateo, CA iTrader: (0)	You might consider installing ISTA on a computer and hooking it up--I have had instances where it gave more info than phone apps. __________________ 2013 335i Msport Black sapphire/Coral red. MHD. stage 2--e30 VRSF DP, ER CP, Dinan Shockware. VRSF 12mm/15mm spacers. Cobra dashcam. Various codings. Last car: 2011 335i Msport. JB4. Vrsf CP
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08-27-2021, 01:24 PM	#28
KeatonK New Member 0 Rep 6 Posts Drives: 2013 335i Join Date: Oct 2015 Location: Temecula, Ca iTrader: (0)	I have had this problem with my car for years. Only does it when its warm and parked for a little bit. If I rev it up a bit totally gone! If you find the issue please post it! __________________ 2013 335i Alpine White 88k miles and going! bm3 stage 1, jb4 (map 0), ER Downpipe, M Performance Exhaust, ER chargepipe, bms intake, Fuel-it Stage 2 LPFP, HR Sport Springs, 19" Morr FS77 M Performance Alcantara Steering Wheel
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09-15-2021, 09:02 AM	#29
Beasty_916 New Member 4 Rep 15 Posts Drives: Bmw 435i Join Date: Aug 2021 Location: Sacramento iTrader: (0)	I decided to lift my car and check the charge pipe again and I found the 2 bung holes with no screws on the bottom of the pipe. I think the screws fell out when driving which was causing a boost leak and probably giving faulty readings to the MAF causing the revving. I closed both of the holes with screws from Home Depot with basic 1/8 NPT thread and loctite So far it’s been 2 weeks since the revving has stopped so hopefully that was the only issue.
	Appreciate 0 Quote

11-07-2021, 11:35 PM	#30
Slo_F80_Mike Private 42 Rep 85 Posts Drives: 2016 M3 (MW SO, 6MT) Join Date: Mar 2021 Location: Sacramento, CA iTrader: (0)	Turns out it was just a boost leak caused by the VRSF charge pipe from the bung hole. The screw plug had fallen out on one hole, other one was quite loose. Got a new plug for the first hole and added some loctite and took the original screw out of second hole and added loctite and tightened that as well.
	Appreciate 0 Quote