Engine Rough Idle on Start-Up

NYF32DRIVER · 05-06-2008, 05:56 PM

I have noticed this for the past 2 days.
Even when the car has been used for some time, not just cold.

It lasts about 6 seconds then clears. It feels as though the engine is "shaking" a bit.

Any ideas ?

Joseph

thekurgan · 05-06-2008, 06:38 PM

Quote:

Originally Posted by NYCE90DRIVER

I have noticed this for the past 2 days.
Even when the car has been used for some time, not just cold.

It lasts about 6 seconds then clears. It feels as though the engine is "shaking" a bit.

Any ideas ?

Joseph

Have your fuel pump checked, that is one of the symptoms as well as the long starting crank time.

jonerik26 · 05-06-2008, 08:01 PM

pretty normal for me... never thought much of it..

M3SWEETNESS · 05-06-2008, 08:11 PM

Most BMWs have rough idle on cold start ups, some more than others. Now if it does it after you engine has warmed up thats not common.....

NYF32DRIVER · 05-06-2008, 08:44 PM

Quote:

Originally Posted by thekurgan

Have your fuel pump checked, that is one of the symptoms as well as the long starting crank time.

My car was manufactured (born) on 1/15/08.

This is well after the fuel pump problem was (supposedly) solved. Also, it starts up with no hesitation.

tahoerdr · 05-28-2008, 04:39 PM

I've got a 1/31/08 production e92 and I get the rough idle on cold startup as well. No issues when warm. It goes away after 15 seconds or so. It starts right up.

mdmaxxx · 05-28-2008, 04:42 PM

i have same thing...dont worry

5soko · 05-28-2008, 05:14 PM

when i start my cvar up in the morning sometimes it stumbles and shakes for a few seconds or a split second and then idles normal until the revs drop to normal level.
car always does it since i got it. sometimes it doesnt do it though and starts up normal and the revs jump higher.

S55F80 · 06-01-2009, 10:26 PM

i have a 2006 bmw 330xi with 90,000 miles every single time i start my car, even after using it and engine is hot, it starts up then idle shoots down to 500 rpm shakes like crazy seems like its about to shut off then shoots up to 1300 rpm and then idles fine. I have an intake and no mufflers or resonator. This started happening after today i tried doing a burnout by letting of the clutch fast. ever since then this is happening. Any ideas?

Darkcyd_Turbo · 06-01-2009, 10:59 PM

Same problem here and have taken it to the dealer twice for the same reason and they said no codes and nothing was wrong so dont worry about it...noticed it less when I used Shell 93oct w/out ethanol but the bastards changed over to 91 w/out ethanol. So right now in the process of finding a different gas station that will give me the same result. I love less shaking!! lol

Sniz · 06-01-2009, 10:59 PM

Quote:

Originally Posted by NYCE90DRIVER

My car was manufactured (born) on 1/15/08.

This is well after the fuel pump problem was (supposedly) solved. Also, it starts up with no hesitation.

its not solved...still

Vudoo4u2 · 06-01-2009, 11:47 PM

same production month here...same thing, im thinking its just a spark plug refresh needed, car runs perfect and has 0 hesitation when starting up

*knock on wood*

x5to330i · 05-14-2010, 11:00 AM

my two cents...

I took mine in and it was the thermorstat...39k miles on the car and the thermostat goes out...really? I think it was more of a sensor than total failure because I never got a hard code. But apparently the sensor is in the same housing as all the other parts so the whole thing needs to be replaced.

RoundelM3 · 05-14-2010, 12:47 PM

Have had 3 3-series now - 01 330i Sport, 03 330iZHP, and current 07 335i coupe - never had rough idle on any of them. Cold starts usually result in higher idle speed for 30 seconds or so, then down to 650, no shaking, etc.

Might try putting some Techron in your tank next time you fill up and run through that thank, see if it cleans things up a bit.

dzenno · 05-14-2010, 01:09 PM

rough idle is one or more bad injectors and a reprogram (dealers replace plugs as well)..most of the time...plugs/coils cause misfires mostly on high load/rpm conditions..

matrix76 · 05-14-2010, 01:59 PM

I have an 09 3 series, had the same problem causing, what I would call, excessive carbon build up at the tailpipe. I had to send it in twice, first was a software update, didn't help much, then the second time they did a firmware update that they said was just released, runs fine now and the fuel economy also improved.

zsapphire7 · 05-14-2010, 02:18 PM

yea most likely early signs injectors are failing.

euromoda84 · 05-14-2010, 02:32 PM

i just took my car in for the same problem and they told me it was my spark plugs. idk if that helps.

AltecBX · 05-14-2010, 05:01 PM

Notice a lot of people stating this. Is this just on the 335 and not the 330 or 325/328?

Jeffman · 01-06-2014, 07:34 PM

I experienced rough start-up and idle bumping up and down (500-1200 rpm) for about ten seconds during the last cold snap, it was 23F in my garage. Happens only when the car has been sitting overnight. And I now always get P29E0 fuel mixture code and sometimes P0171 lean code. I'm thinking injectors because it only happens when sitting overnight cold.

pwr hungry · 01-06-2014, 07:39 PM

Quote:

Originally Posted by Jeffman

I experienced rough start-up and idle bumping up and down (500-1200 rpm) for about ten seconds during the last cold snap, it was 23F in my garage. Happens only when the car has been sitting overnight. And I now always get P29E0 fuel mixture code and sometimes P0171 lean code. I'm thinking injectors because it only happens when sitting overnight cold.

My thoughts would be a leaky injector.

E90_831 · 02-19-2015, 12:26 AM

Not to bring up a thread from the dead.

Im starting to experience this issue as well. My car has 26,xxx miles its under CPO should I just bite the bullet or try by swapping out the spark plugs first.? Or is a leaking injector the most common thing.? I'd Rather not have to take my car into the dealer unless I have to.

TIA

05-06-2008, 05:56 PM	#1
NYF32DRIVER Lieutenant 135 Rep 556 Posts Drives: 2016 428i X Drive Join Date: Feb 2006 Location: Long Island, NY, USA iTrader: (0)	Engine Rough Idle on Start-Up I have noticed this for the past 2 days. Even when the car has been used for some time, not just cold. It lasts about 6 seconds then clears. It feels as though the engine is "shaking" a bit. Any ideas ? Joseph __________________ 2016 428i X Drive. Mineral Gray Metallic. Born 2/2016, Munich Factory. Member BMW CCA Since 2008
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05-06-2008, 08:01 PM	#3
jonerik26 Lieutenant Colonel 59 Rep 1,906 Posts Drives: black 335i e90 PRE-LCI Join Date: Apr 2006 Location: somewhere iTrader: (23) Garage List 2007 335i [8.00] 1998 Acura Integra [8.50] 2006 325i [8.00]	pretty normal for me... never thought much of it.. __________________
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05-06-2008, 08:11 PM	#4
M3SWEETNESS Watch This! 34 Rep 705 Posts Drives: 2010 E92 M3 Join Date: Jul 2007 Location: Texas iTrader: (4)	Most BMWs have rough idle on cold start ups, some more than others. Now if it does it after you engine has warmed up thats not common.....
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05-28-2008, 04:39 PM	#6
tahoerdr Private First Class 9 Rep 102 Posts Drives: E92 335xi Join Date: Apr 2008 Location: Bay Area, CA iTrader: (3)	I've got a 1/31/08 production e92 and I get the rough idle on cold startup as well. No issues when warm. It goes away after 15 seconds or so. It starts right up.
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05-28-2008, 04:42 PM	#7
mdmaxxx Captain 26 Rep 826 Posts Drives: 2007 335i AW Join Date: Jan 2008 Location: Long Island NY iTrader: (2)	i have same thing...dont worry
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05-28-2008, 05:14 PM	#8
5soko Brigadier General 351 Rep 4,633 Posts Drives: M5 Join Date: Aug 2007 Location: Brooklyn, NY iTrader: (4)	when i start my cvar up in the morning sometimes it stumbles and shakes for a few seconds or a split second and then idles normal until the revs drop to normal level. car always does it since i got it. sometimes it doesnt do it though and starts up normal and the revs jump higher.
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06-01-2009, 10:26 PM	#9
S55F80 Private First Class 25 Rep 134 Posts Drives: 2011 X5M Join Date: Dec 2008 Location: Queens, NY iTrader: (0) Garage List 2006 BMW [0.00]	i have a 2006 bmw 330xi with 90,000 miles every single time i start my car, even after using it and engine is hot, it starts up then idle shoots down to 500 rpm shakes like crazy seems like its about to shut off then shoots up to 1300 rpm and then idles fine. I have an intake and no mufflers or resonator. This started happening after today i tried doing a burnout by letting of the clutch fast. ever since then this is happening. Any ideas?
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06-01-2009, 10:59 PM	#10
Darkcyd_Turbo "Booty Hole Bandit" 34 Rep 1,597 Posts Drives: 2008 Montego E92 335xi Join Date: Apr 2009 Location: Madison, WI iTrader: (14)	Same problem here and have taken it to the dealer twice for the same reason and they said no codes and nothing was wrong so dont worry about it...noticed it less when I used Shell 93oct w/out ethanol but the bastards changed over to 91 w/out ethanol. So right now in the process of finding a different gas station that will give me the same result. I love less shaking!! lol
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06-01-2009, 11:47 PM	#12
Vudoo4u2 Night Sh1ft 471 Rep 3,079 Posts Drives: F95 X5MC LCI Join Date: Oct 2007 Location: It's bobsled time iTrader: (3) Garage List 2024 BMW X5M Compet ... [0.00]	same production month here...same thing, im thinking its just a spark plug refresh needed, car runs perfect and has 0 hesitation when starting up knock on wood __________________ "Your first 10,000 photographs are your worst.” ― Henri Cartier-Bresson
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05-14-2010, 11:00 AM	#13
x5to330i Erode 21 Rep 100 Posts Drives: Graphite BMW 330i--2006 Join Date: May 2010 Location: Raleigh, nc iTrader: (0)	my two cents... I took mine in and it was the thermorstat...39k miles on the car and the thermostat goes out...really? I think it was more of a sensor than total failure because I never got a hard code. But apparently the sensor is in the same housing as all the other parts so the whole thing needs to be replaced. __________________ 2002 BMW X5---2003 Ford Explorer Eddie Bauer---1996 Ford Mustang GT---2001 Jeep Grand Cherokee Limited---1993 Jeep Wrangler ---2006 330i---2003 Dodge Dakota Quad Cab---
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05-14-2010, 12:47 PM	#14
RoundelM3 Major General 1923 Rep 7,037 Posts Drives: 15 F80 M3, 22 G01 X3 30i Join Date: Apr 2010 Location: Clayton, NC iTrader: (2) Garage List 2015 BMW M3 [7.90] 2022 BMW X3 [9.87]	Have had 3 3-series now - 01 330i Sport, 03 330iZHP, and current 07 335i coupe - never had rough idle on any of them. Cold starts usually result in higher idle speed for 30 seconds or so, then down to 650, no shaking, etc. Might try putting some Techron in your tank next time you fill up and run through that thank, see if it cleans things up a bit. __________________ 2015 F80 ///M3 Sedan 7DCT Tanzanite, 2022 X3 sDrive30i 8AT Brooklyn Grey
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05-14-2010, 01:09 PM	#15
dzenno Banned 287 Rep 5,876 Posts Drives: Join Date: Feb 2006 iTrader: (1)	rough idle is one or more bad injectors and a reprogram (dealers replace plugs as well)..most of the time...plugs/coils cause misfires mostly on high load/rpm conditions..
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05-14-2010, 01:59 PM	#16
matrix76 Major 63 Rep 1,300 Posts Drives: 2020 Z4 M40i Black/Red Join Date: Sep 2009 Location: Port Dover, Ontario iTrader: (1)	I have an 09 3 series, had the same problem causing, what I would call, excessive carbon build up at the tailpipe. I had to send it in twice, first was a software update, didn't help much, then the second time they did a firmware update that they said was just released, runs fine now and the fuel economy also improved. __________________ Brian Black Sapphire, Black w/Burrwood Trim & Shifter, 162's, Mtec H8 AE's, DS1 HID 6000K
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05-14-2010, 02:18 PM	#17
zsapphire7 Colonel 111 Rep 2,368 Posts Drives: 08 e92 M3 Join Date: Oct 2007 Location: SF Bay Area iTrader: (21)	yea most likely early signs injectors are failing.
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05-14-2010, 02:32 PM	#18
euromoda84 Private 10 Rep 77 Posts Drives: f30 335i Join Date: Nov 2009 Location: So Cal iTrader: (0)	i just took my car in for the same problem and they told me it was my spark plugs. idk if that helps.
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05-14-2010, 05:01 PM	#19
AltecBX Colonel 340 Rep 2,663 Posts Drives: BMW 335xi Sedan; BMW M3 ZCP Join Date: Nov 2007 Location: NYC iTrader: (0) Garage List 2018 BMW M3 ZCP [0.00] 2007 BMW 335Xi [0.00]	Notice a lot of people stating this. Is this just on the 335 and not the 330 or 325/328? __________________ 335xi Sedan 6AT \| Weather(70-85°F) \| N54 Tune Comparison Chart \|\| N54 Turbo Upgrade Comparison Chart -PROcede Rev. 2.5 ~ v5 (3/17 maps) / JB4 (8/21 maps) / COBB (Stg2+FMIC LT Aggressive maps) †Procede Map2(UT 45 - IGN 40) Aggression Target 2.0 \| 0-60 in 4.0sec \|\| †Cobb E30 LT (35% Ethanol/65% 93 Octane) \| 0-60 in 3.9sec AR Design Catless DP \| BMS DCI + OCC \| ETS 5 FMIC \| Alpina B3 Trans Flash \|235/265 19" Michelin PSS
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01-06-2014, 07:34 PM	#20
Jeffman Lieutenant 32 Rep 492 Posts Drives: 2008 335xi E90 Join Date: Jul 2010 Location: Somewhere in America iTrader: (1) Garage List 2008 335xi Sedan [0.00]	I experienced rough start-up and idle bumping up and down (500-1200 rpm) for about ten seconds during the last cold snap, it was 23F in my garage. Happens only when the car has been sitting overnight. And I now always get P29E0 fuel mixture code and sometimes P0171 lean code. I'm thinking injectors because it only happens when sitting overnight cold. __________________ MHD Self-Tuned Scaled FlexFuel Map \| M-Boost \| N20 Tmap \| Helix IC \| Fuel-It Stage 2 LPFP \| BMS DCI \| BMS Thermostat Delete \| CP-E Charge Pipe \| Tial-Q BOV \| Apex Arc-8 Hyper Silver \| Michelin PSS \| Cool Carbon Brake Pads R/T \| SS Brakelines \| ECS 2-Piece Rotors F/R \| xHP Stage 3 \| xDelete Sport \| KW-V1 Coilovers \| Turner Strut Brace \| Lux Angel Eyes \| CF Kidneys \| Scoops
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02-19-2015, 12:26 AM	#22
E90_831 Lieutenant 23 Rep 448 Posts Drives: 335i Msport Join Date: Jul 2013 Location: Monterey, Ca iTrader: (4) Garage List 2014 GMC Sierra Denali [0.00] 2006 Lancer Evo Rs [0.00]	Not to bring up a thread from the dead. Im starting to experience this issue as well. My car has 26,xxx miles its under CPO should I just bite the bullet or try by swapping out the spark plugs first.? Or is a leaking injector the most common thing.? I'd Rather not have to take my car into the dealer unless I have to. TIA
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