low rpm very shaky?

raywong · 07-07-2011, 02:50 PM

let say my car is rolling slowly on 2nd gear, 1600rpm... If I floor the throttle now, the car will accelerate from 1600-2000rpm in less than a second, but it is shaky. It smooths out after 2000rpm. It feels like a loss engine/trans mount, or engine miss fire. This only happen in low rpm(under 2000), and in higher gear. Is this normal?

Erhan · 07-07-2011, 02:57 PM

Not sure if it is normal. IIRC, the S65 gives 85% of peak torque starting from 2krpm. Could be related to that?

radiantm3 · 07-07-2011, 02:59 PM

My car tends to buck once in awhile at very low RPMs when the engine is not warmed up all the way. It's a bit embarrassing when it happens in a parking lot with people around because it looks like I'm just learning to drive a manual.

sensi09 · 07-07-2011, 03:01 PM

The shaky feeling like the car is about to stall? Shift down

mdosu · 07-07-2011, 04:01 PM

are you doing this right after you start the car up? it might be a cold transmission/clutch.

I have a 6 speed and right after i start the car up cold, when I drive and put it in 2nd gear, there's some jerkiness in low rpm ranges, after the car warms up, it's all smooth after that.

JoLo · 07-07-2011, 04:40 PM

Yup, i have a 6spd and when the engines cold it is very jerky at low rpm's.

ChrisK · 07-07-2011, 04:43 PM

Same here - a little rough when she cold. OP, sounds normal to me.

sameh · 07-07-2011, 05:15 PM

Can you try same thing on MDM or DSC off and report back. I have a feeling it's related to DSC interference once you floor it (as you said).

Sean05 · 07-07-2011, 05:57 PM

normal

EDIT; normal for 6MT.. not sure on DCT...

mot · 07-07-2011, 06:02 PM

post #6 and #9 are spot on

1sikbmr · 07-07-2011, 09:02 PM

Sounds normal to me... 6MT is always jerky at start

AngelinIsRich08 · 07-07-2011, 09:10 PM

Kinda off-topic but I'm thinking of buying an E90 M3 and was wondering if it's ok to redline the car in 2nd gear. I know that redlining in 3rd will easily make me pass most speed-limits but since I don't track I'm still hoping to be able to fully experience this NA engine's genius.

quackman · 07-07-2011, 09:30 PM

Quote:

Originally Posted by AngelinIsRich08

Kinda off-topic but I'm thinking of buying an E90 M3 and was wondering if it's ok to redline the car in 2nd gear. I know that redlining in 3rd will easily make me pass most speed-limits but since I don't track I'm still hoping to be able to fully experience this NA engine's genius.

What do you mean by "ok"? Legally? well, it redlines 2nd gear at speeds reaching like 70 so... legal enough

As far as its being ok for the car, well yeah it's fine. And it sounds, feels, etc. AMAZING on the M3. Just don't bounce it off the rev-limiter like a maniac and it's cool.

raywong · 07-07-2011, 09:31 PM

thanks for the response guys.
My car is 6mt.
it's rough regardless cold or warm.
It is not very noticeable, girls calling me paranoid.
It is more noticeable if road has incline.
It happens on 3rd gear too.

Vise · 07-07-2011, 09:37 PM

Quote:

Originally Posted by JoLo

Yup, i have a 6spd and when the engines cold it is very jerky at low rpm's.

Same. This has been discussed before a few times too, appears to be fairly normal behaviour.

Radiation Joe · 07-07-2011, 10:05 PM

My guess is you have about 20k to 25k miles on the car. Replace the spark plugs and it will fix it right up. I'm on my second e90 and both have had this behavior, especially when cold. It got worse until around 30k miles when the plugs were replaced. After that it was fine.

elp_jc · 07-08-2011, 12:16 AM

Nobody has called you on this, but flooring the throttle at 1,600 rpm is crazy man. You're wearing/beating/lugging the crap out of your engine man, and it's bucking in protest. And yes, bucking under light throttle and lower rpm when cold is normal for this engine. You need to run a bit higher rpm in 1st, then give it a bit of throttle in 2nd and it doesn't buck. After engine is hot, it's always smooth in my case. Do it wrong, and car is going to buck like a bronco

.

mdosu · 07-08-2011, 11:01 AM

Quote:

Originally Posted by Radiation Joe

My guess is you have about 20k to 25k miles on the car. Replace the spark plugs and it will fix it right up. I'm on my second e90 and both have had this behavior, especially when cold. It got worse until around 30k miles when the plugs were replaced. After that it was fine.

are you saying it's a spark plug issue? or are you saying it's cold transmission issue? B/c most of us attribute it to cold transmission.

vinnycg · 07-08-2011, 12:47 PM

6mt here with bucking on cold tranny..I would say its normal.

-Vin

1sikbmr · 07-08-2011, 01:52 PM

Quote:

Originally Posted by elp_jc

Nobody has called you on this, but flooring the throttle at 1,600 rpm is crazy man. You're wearing/beating/lugging the crap out of your engine man, and it's bucking in protest. And yes, bucking under light throttle and lower rpm when cold is normal for this engine. You need to run a bit higher rpm in 1st, then give it a bit of throttle in 2nd and it doesn't buck. After engine is hot, it's always smooth in my case. Do it wrong, and car is going to buck like a bronco

.

+1

raywong · 07-17-2011, 05:57 AM

Quote:

Originally Posted by Radiation Joe

My guess is you have about 20k to 25k miles on the car. Replace the spark plugs and it will fix it right up. I'm on my second e90 and both have had this behavior, especially when cold. It got worse until around 30k miles when the plugs were replaced. After that it was fine.

Just want to report back here. Joe was right on, after replacing all plugs(tips worn out), the idle is so much smoother, huge low end power gain, very solid acceleration when I floor it at 1500rpm, cold or warm.
everyone should test their low end performance at 25000 miles, change your spark plugs if any of the above symptom exists.

GIdriver · 07-17-2011, 06:59 AM

Quote:

Originally Posted by raywong

let say my car is rolling slowly on 2nd gear, 1600rpm... If I floor the throttle now, the car will accelerate from 1600-2000rpm in less than a second, but it is shaky. It smooths out after 2000rpm. It feels like a loss engine/trans mount, or engine miss fire. This only happen in low rpm(under 2000), and in higher gear. Is this normal?

Sounds normal to me. I believe there's a thread in this forum on e9x M3 noises an rattles. You might want to search for that.

07-07-2011, 02:50 PM	#1
raywong Private First Class Drives: E92M3 Join Date: Jun 2011 Location: Hong Kong Posts: 126 iTrader: (0)	low rpm very shaky? let say my car is rolling slowly on 2nd gear, 1600rpm... If I floor the throttle now, the car will accelerate from 1600-2000rpm in less than a second, but it is shaky. It smooths out after 2000rpm. It feels like a loss engine/trans mount, or engine miss fire. This only happen in low rpm(under 2000), and in higher gear. Is this normal?
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07-07-2011, 02:57 PM	#2
Erhan Colonel Drives: Cooper S Join Date: Oct 2008 Location: Seattle Posts: 2,462 iTrader: (0)	Not sure if it is normal. IIRC, the S65 gives 85% of peak torque starting from 2krpm. Could be related to that? __________________ 2011 MINI Cooper S previous cars: E92 M3, Z4MC, Z4 Roadster, E36 328 Sedan

07-07-2011, 02:59 PM	#3
radiantm3 AWD...training wheels for RWD Drives: 11 E92 M3, 13 F25 X3 xdrive35i Join Date: Sep 2008 Location: Fremont, CA Posts: 3,140 iTrader: (5) Garage List 2011 E92 M3 [4.75] 2013 BMW X3 xdrive35 [4.50]	My car tends to buck once in awhile at very low RPMs when the engine is not warmed up all the way. It's a bit embarrassing when it happens in a parking lot with people around because it looks like I'm just learning to drive a manual. __________________ 2011.5 E92 M3 6MT / 45,000+ miles / 3400lbs with no driver, half tank / M3 GTS Aero, Rear Seat Delete, Half Cage • Schroth 6 Point Harness • Recaro Profi • 18" BBS FI / 18" TE37SL Black Edition • Ohlins RT • Vorshlag Camber Plates • Brembo 380GT • Endless Pads • Akrapovic Evo • RD Sport Sways • ESS Tune • Supercharger Delete (1:42 @ Laguna Seca, 2:09 @ Thunderhill, 1:56 @ Infineon)

07-07-2011, 04:01 PM	#5
mdosu Help! Can't decide btw MW & AW, 1st world problems Drives: 2008.99989 SSII E90 "Civic" Join Date: Oct 2009 Location: Northern Virginia Posts: 5,952 iTrader: (4)	are you doing this right after you start the car up? it might be a cold transmission/clutch. I have a 6 speed and right after i start the car up cold, when I drive and put it in 2nd gear, there's some jerkiness in low rpm ranges, after the car warms up, it's all smooth after that. __________________ Yes, that's a xmas tree in my trunk

07-07-2011, 04:43 PM	#7
ChrisK Brigadier General Drives: 2011 E92 M3 Join Date: Jun 2007 Location: IL Posts: 4,634 iTrader: (4)	Same here - a little rough when she cold. OP, sounds normal to me. __________________ 2011 E92 M3: AW/BLK • DCT Europäische Lieferung am 6. August 2010

07-07-2011, 03:01 PM	#4
sensi09 Lieutenant Colonel Drives: . Join Date: Dec 2010 Location: socal Posts: 1,512 iTrader: (1)	The shaky feeling like the car is about to stall? Shift down

07-07-2011, 04:40 PM	#6
JoLo Second Lieutenant Drives: ///2011.5 ///E90 ///AW ///ZCP Join Date: Apr 2011 Location: NNJ Posts: 226 iTrader: (0)	Yup, i have a 6spd and when the engines cold it is very jerky at low rpm's.

07-07-2011, 05:15 PM	#8
sameh Major Drives: 2011 E92 M3 DCT JetBlk Join Date: Aug 2010 Location: NC Posts: 1,423 iTrader: (0)	Can you try same thing on MDM or DSC off and report back. I have a feeling it's related to DSC interference once you floor it (as you said). __________________ 2011 E92 BatMobile JtBlk/Blk/Blk CF

07-07-2011, 05:57 PM	#9
Sean05 Putcha ang ganda... Drives: 08 MR E92 M3 Join Date: Feb 2010 Location: Los Angeles, Brea CA. Posts: 4,984 iTrader: (9)	normal EDIT; normal for 6MT.. not sure on DCT... __________________

07-07-2011, 06:02 PM	#10
mot Captain Drives: e92 AW M3 6MT Join Date: Oct 2010 Location: Bay Area, California Posts: 862 iTrader: (8)	post #6 and #9 are spot on

07-07-2011, 09:02 PM	#11
1sikbmr Brigadier General Drives: E90 M3 6MT Join Date: Mar 2010 Location: New York Posts: 3,106 iTrader: (12)	Sounds normal to me... 6MT is always jerky at start __________________ E90 ///M3 6MT Atlantis Blue - Fox red Gloss black grilles/Red gills\|V1 hardwire\|Painted reflectors\|ZHP lighted shift knob\|VMR V710 silver\|GTS lip\|Lux custom 8k kit\|AA Green Filter\| AA Pulley\| RPI GTM Exhaust\|Sosi x-pipe\|BMW Performance Steering Wheel V1\|

07-07-2011, 09:10 PM	#12
AngelinIsRich08 Banned Drives: '11 X5M, '09 CTS Join Date: Jan 2011 Location: St. Louis, MO Posts: 709 iTrader: (0)	Kinda off-topic but I'm thinking of buying an E90 M3 and was wondering if it's ok to redline the car in 2nd gear. I know that redlining in 3rd will easily make me pass most speed-limits but since I don't track I'm still hoping to be able to fully experience this NA engine's genius.

07-07-2011, 09:31 PM	#14
raywong Private First Class Drives: E92M3 Join Date: Jun 2011 Location: Hong Kong Posts: 126 iTrader: (0)	thanks for the response guys. My car is 6mt. it's rough regardless cold or warm. It is not very noticeable, girls calling me paranoid. It is more noticeable if road has incline. It happens on 3rd gear too.

07-07-2011, 10:05 PM	#16
Radiation Joe Veni Vidi Vici Drives: '11 JB/BBe-6sp-e90 Join Date: Jul 2008 Location: Macungie PA Posts: 2,676 iTrader: (0) Garage List 2003 RS6 - Sold [0.00] 2011 e90 M3 [4.25] 2009 e90 M3 - Gone [0.00] 2003 M3 SOLD [0.00] old 2002 [5.00]	My guess is you have about 20k to 25k miles on the car. Replace the spark plugs and it will fix it right up. I'm on my second e90 and both have had this behavior, especially when cold. It got worse until around 30k miles when the plugs were replaced. After that it was fine. __________________ Dinan compliment of stuff plus PF rotors and RG63s. Enough for now.

07-08-2011, 12:16 AM	#17
elp_jc Brigadier General Drives: . Join Date: May 2008 Location: . Posts: 4,912 iTrader: (0)	Nobody has called you on this, but flooring the throttle at 1,600 rpm is crazy man. You're wearing/beating/lugging the crap out of your engine man, and it's bucking in protest. And yes, bucking under light throttle and lower rpm when cold is normal for this engine. You need to run a bit higher rpm in 1st, then give it a bit of throttle in 2nd and it doesn't buck. After engine is hot, it's always smooth in my case. Do it wrong, and car is going to buck like a bronco .

07-08-2011, 12:47 PM	#19
vinnycg Captain Drives: 2005 Infiniti G35 Coupe Join Date: Dec 2007 Location: New York Posts: 704 iTrader: (1)	6mt here with bucking on cold tranny..I would say its normal. -Vin

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