'04 3.0i Making Up-shift Noises Under Heavy Acceleration

jns_e85 · 09-07-2017, 09:44 AM

Hi everyone,

My '04 3.0i (steptronic auto slushbox, approaching 100k miles) has been making up-shift "snorts/farts" under moderate to heavy acceleration, with it being more pronounced under full load. It happens in all modes, regardless of shift mode used and if sport is activated. Closest thing I can relate it to is newer cars equipped with DCT or DSG making their heavy load up-shift noises.

While it sounds kinda neat (and admittedly, makes me giggle when it happens), just curious if any other members have experienced this on their cars and if I should be concerned or looking for gremlins

Thoughts?

rjahl · 09-07-2017, 06:44 PM

Quote:

Originally Posted by jns_e85

Hi everyone,

My '04 3.0i (steptronic auto slushbox, approaching 100k miles) has been making up-shift "snorts/farts" under moderate to heavy acceleration, with it being more pronounced under full load. It happens in all modes, regardless of shift mode used and if sport is activated. Closest thing I can relate it to is newer cars equipped with DCT or DSG making their heavy load up-shift noises.

While it sounds kinda neat (and admittedly, makes me giggle when it happens), just curious if any other members have experienced this on their cars and if I should be concerned or looking for gremlins

Thoughts?

How old is the transmission fluid?

Anything past 50K is too long.

jns_e85 · 09-08-2017, 03:55 PM

Quote:

Originally Posted by rjahl

How old is the transmission fluid?

Anything past 50K is too long.

Trans fluid and filter was replaced last year, as well as replaced two years prior to that. Current life on the fluid is about 1.25 years and maybe 12,000 miles. Used OEM filter and gasket, as well as RedLine D4 ATF since this car sees A LOT of autocrosses with the misses driving

StickMon · 09-11-2017, 07:45 PM

Quote:

Originally Posted by jns_e85

... "snorts/farts" under moderate to heavy acceleration ...

Noises are from the transmission, or the exhaust?

Several months back my exhaust was farting under hard acceleration.
Sounded like a misfire, but couldn't really feel it.

Turned out to be a coil that was arcing through the side.

jns_e85 · 09-12-2017, 11:35 AM

Quote:

Originally Posted by StickMon

Noises are from the transmission, or the exhaust?

Several months back my exhaust was farting under hard acceleration.
Sounded like a misfire, but couldn't really feel it.

Turned out to be a coil that was arcing through the side.

Interesting. It is definitely coming from the exhaust. A friend of mine actually asked when the last time I did spark plugs and it has admittedly been at least two years, so I will start there. Maybe some fouling will be present on one of the plugs. How did you figure out it was arcing through the side?

Also, did you have an engine code for the misfire? Two autocrosses ago a buddy of mine was driving the car at his first event and the car went into limp mode on one of his runs. When I pulled the code (used Carly for BMW) the only code that came back read "Misfire Cylinder 11"

StickMon · 09-12-2017, 12:55 PM

Mine got progressively worse over the course of a week.
Coming home from work one night I stomped it hard going up a steep hill.
It popped a couple of times and then took one cylinder out of the rotation.
SES light came on and I limped up the rest of the hill on 5 cylinders.
Once I crested the hill and unloaded it, the missing cylinder came back on line and the SES went out.
When I got home I scanned it and got Misfire, Cylinder #5.
Pulled the #5 coil and there was a little grey dusty spot on it near the top and a corresponding black dusty spot on the side of the spark plug tube.
I work with high voltage for a living, so I immediately recognized it as an arc.
Cleaned the spark plug tube with alcohol, popped in a spare coil. All better now.

jns_e85 · 09-12-2017, 01:21 PM

Got it, mine has been doing this for a couple months now, and the autocross incident where it cleared up immediately after coming to a stop is the only time I encountered limp mode. When I swap plugs I will pay special attention to the coils and sidewalls looking for an arc. Thanks!

jns_e85 · 09-26-2017, 12:10 PM

UPDATE!

After replacing the plugs, noticed 4 out of 6 coil packs were looking shoddy. While I did not see any signs of arcing from the coils, given the mileage of the car (and assuming they were original), I opted to replace them as well.

After a quick drive, it appears the noise was related to old plugs and/or coil packs, as the sound has not replicated for me.

09-07-2017, 09:44 AM	#1
jns_e85 Second Lieutenant 74 Rep 264 Posts Drives: '05 X3 2.5i, '06 z4M, '17 M2 Join Date: Feb 2014 Location: Chicago Area iTrader: (3)	'04 3.0i Making Up-shift Noises Under Heavy Acceleration - Normal? Hi everyone, My '04 3.0i (steptronic auto slushbox, approaching 100k miles) has been making up-shift "snorts/farts" under moderate to heavy acceleration, with it being more pronounced under full load. It happens in all modes, regardless of shift mode used and if sport is activated. Closest thing I can relate it to is newer cars equipped with DCT or DSG making their heavy load up-shift noises. While it sounds kinda neat (and admittedly, makes me giggle when it happens), just curious if any other members have experienced this on their cars and if I should be concerned or looking for gremlins Thoughts? __________________ 2017 M2 - Camber Hubs, MPE, and some other goodies 2006 Z4M - Epic Tune / Eventuri CAI / Euro Headers / Stromung / FA 500 / AS SSK / Arc 8s 2004 Z4 3.0i - Gone, but not forgotten!
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09-12-2017, 12:55 PM	#6
StickMon My other car is on Mars 636 Rep 3,124 Posts Drives: 2006 MR Join Date: Feb 2011 Location: Lo-Cal iTrader: (1)	Mine got progressively worse over the course of a week. Coming home from work one night I stomped it hard going up a steep hill. It popped a couple of times and then took one cylinder out of the rotation. SES light came on and I limped up the rest of the hill on 5 cylinders. Once I crested the hill and unloaded it, the missing cylinder came back on line and the SES went out. When I got home I scanned it and got Misfire, Cylinder #5. Pulled the #5 coil and there was a little grey dusty spot on it near the top and a corresponding black dusty spot on the side of the spark plug tube. I work with high voltage for a living, so I immediately recognized it as an arc. Cleaned the spark plug tube with alcohol, popped in a spare coil. All better now. __________________ Warning: May contain traces of nuts.
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09-12-2017, 01:21 PM	#7
jns_e85 Second Lieutenant 74 Rep 264 Posts Drives: '05 X3 2.5i, '06 z4M, '17 M2 Join Date: Feb 2014 Location: Chicago Area iTrader: (3)	Got it, mine has been doing this for a couple months now, and the autocross incident where it cleared up immediately after coming to a stop is the only time I encountered limp mode. When I swap plugs I will pay special attention to the coils and sidewalls looking for an arc. Thanks! __________________ 2017 M2 - Camber Hubs, MPE, and some other goodies 2006 Z4M - Epic Tune / Eventuri CAI / Euro Headers / Stromung / FA 500 / AS SSK / Arc 8s 2004 Z4 3.0i - Gone, but not forgotten!
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09-26-2017, 12:10 PM	#8
jns_e85 Second Lieutenant 74 Rep 264 Posts Drives: '05 X3 2.5i, '06 z4M, '17 M2 Join Date: Feb 2014 Location: Chicago Area iTrader: (3)	UPDATE! After replacing the plugs, noticed 4 out of 6 coil packs were looking shoddy. While I did not see any signs of arcing from the coils, given the mileage of the car (and assuming they were original), I opted to replace them as well. After a quick drive, it appears the noise was related to old plugs and/or coil packs, as the sound has not replicated for me. __________________ 2017 M2 - Camber Hubs, MPE, and some other goodies 2006 Z4M - Epic Tune / Eventuri CAI / Euro Headers / Stromung / FA 500 / AS SSK / Arc 8s 2004 Z4 3.0i - Gone, but not forgotten!
	Appreciate 0 Quote

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