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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Thu, Oct-04-2018, 09:48:56 PM   #1
M3 dude
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Default stutter at light throttle.

hello all,

i have a 2001 m3 with 220k km on the clock (138k miles). 6mt transmission
i've been getting a slight hiccup when holding a cruising speed, with minimal throttle (typically 2k - 3k rpm - most severe at 2.5k).
seems worse when cold.
no codes thrown.
under more throttle, car pulls like a champ.

i've reset throttle adaptations, vanos has been overhauled (excl solenoid), car serviced regularly, good fuel used etc etc.
i have noticed that at idle, theres a chatter coming from the throttle controller (you can feel the throttle linkage pulsing) like some sort of hysteresis.
leads me to conclude whatever that chatter is, it affects throttle position at light throttle application. maybe TPS are dodgy?

has anyone come across these symptoms previously?
thanks for your help.

Last edited by M3 dude; Thu, Oct-04-2018 at 11:35:02 PM.
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Old Thu, Oct-04-2018, 11:08:35 PM   #2
Good
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Default Re: stutter at light throttle.

6-Speed or SMG?
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2006 M3 SILBERGRAU COMPETITION

EXTERIORJCSL 1X1 DIFFUSER | VÖRSTEINER CSL BUMPER
PREVENTATIVE ▌ VANOS BEISAN LOCKDOWN: UPPER GUIDE CHAIN | SOLENOID COIL PACK | OIL PUMP DISK
EXHAUSTSUPERSPRINT EXHAUST ~ OVERSIZED STEPPED V1 HEADERS | RACE CATTED SEC 1 | RESONATED X-PIPE SEC 2 | SPORT (GEN 2) SEC 3
BRAKES ▌ STOCK CSL/ZCP ROTORS | PORSCHE 996 BREMBO CALIPERS | SS LINES
WHEELS ▌ STOCK ZCP BBS 19" | 75MM ECS/TMS F&R WHEEL STUD CONVERSION
SUSPENSIONTURNER MOTORSPORT 30MM FRONT SWAY BAR | KW V2 COILOVERS | GROUND CONTROL CAMBER PLATES | SDW RTABS
ENGINE ▌ TUNED BY PAUL-CLAUDE | KARBONIUS CSL AIRBOX (ALPHA N), OEM SNORKEL (FLAP DELETE), OIL CATCH CAN
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Old Thu, Oct-04-2018, 11:25:55 PM   #3
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Default Re: stutter at light throttle.

6MT. cheers
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Old Fri, Oct-05-2018, 12:12:17 AM   #4
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Default Re: stutter at light throttle.

Your ICV aka idle control valve is carboned up. It’s under the intake plenum which you must remove to get access to then you’ll need spare hose clamps to put it back on. Do some searches on DIY and you’ll be good to go.
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Old Fri, Oct-05-2018, 02:48:30 AM   #5
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Default Re: stutter at light throttle.

Quote:
Originally Posted by rovert604 View Post
Your ICV aka idle control valve is carboned up. It’s under the intake plenum which you must remove to get access to then you’ll need spare hose clamps to put it back on. Do some searches on DIY and you’ll be good to go.
thanks i'll give it a go.
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Old Fri, Oct-05-2018, 03:21:16 AM   #6
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Default Re: stutter at light throttle.

I'm experiencing the cruising hiccup too and it looks to be the fuel pump starting to go out (at 165k miles). Put that on your list to change after the icv cleaning if you haven't already done so.
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Old Fri, Oct-05-2018, 04:26:55 AM   #7
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Default Re: stutter at light throttle.

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Originally Posted by M3 dude View Post
thanks i'll give it a go.


Make sure you have extra SMG fluid because you may need to remove the hose that connects the reservoir to the pump. The bottom of the reservoir has a valve that seals shut once the hose is pulled out but it’s not that “sealed”. Still leaks. But at least maybe you can empty it and fill with new fluid as a small refresher.

Learn how the ITB hose clamps work with a 90° needle nose plier. They release, go into holding mode, and clamp shut mode. They’re great multi-use clamps once you give yourself some patience to understand how they work.

Get plenty of brake cleaner to so you can clean out the intake plenum. There will be a lot of oil residue inside at the bottom and the horns where air enters the throttle bodies. You can even take the time to clean the ITBs too!
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Old Fri, Oct-05-2018, 04:37:22 AM   #8
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Default Re: stutter at light throttle.

Quote:
Originally Posted by rovert604 View Post
Make sure you have extra SMG fluid because you may need to remove the hose that connects the reservoir to the pump. The bottom of the reservoir has a valve that seals shut once the hose is pulled out but it’s not that “sealed”. Still leaks. But at least maybe you can empty it and fill with new fluid as a small refresher.

Learn how the ITB hose clamps work with a 90° needle nose plier. They release, go into holding mode, and clamp shut mode. They’re great multi-use clamps once you give yourself some patience to understand how they work.

Get plenty of brake cleaner to so you can clean out the intake plenum. There will be a lot of oil residue inside at the bottom and the horns where air enters the throttle bodies. You can even take the time to clean the ITBs too!
thanks mate. i had the manifold off before so now i've got worm drive clamps on. i do a 2- yearly wash out of the manifold to get all that crap out of there.

last time i cleaned the ICV was about 3 years ago. reckon it would have clogged up since then?
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Old Fri, Oct-05-2018, 04:42:29 AM   #9
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Default Re: stutter at light throttle.

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Originally Posted by M3 dude View Post

last time i cleaned the ICV was about 3 years ago. reckon it would have clogged up since then?

I’m guessing it all depends how much cold idling the ICV has to deal with and how much oil vapor gets stuck. Mine had exactly what issues you had until I cleaned it. But after having to swap the SMG motor which was maybe a little over 2 years after, the ICV still had some black fluid come out after filling it with brake cleaner and shaking to dissolve everything inside. I never had any idle symptoms though but since I have access to it I just give it a clean.
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Old Fri, Oct-05-2018, 07:25:43 AM   #10
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Default Re: stutter at light throttle.

Every time I’ve had these kind of symptoms it ended up being one of the throttle position sensors.
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Discussing Comprehensive CSL Intake Thread in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)