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Old 06-20-2011, 05:23 PM   #1
mrbcc
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Stumped. Power delivery shudder at~3kRPM+ in 3rd gear on up

help! My '04 330i shudders under acceleration at about 3K+ RPM. Usually it's when I'm on the FW and I push the accelerator to pass someone etc. The car accelerates, but it's a sorta sick feeling acceleration. It's not evident in 1st or 2nd, but I've felt it in 3rd on up to 6th. It's also not there when I accelerate slowly.

Any ideas? My mechanic said there was a hole in an air line. He replaced it and re-booted the car's "driving memory" but it's still there. This car is just not right without smooth power delivery...
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Old 06-20-2011, 05:28 PM   #2
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SES light? auto or manual?
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Old 06-20-2011, 05:31 PM   #3
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In my e36 wayyy back when, I had similar problems. My car stated to show a lack of oomph so to speak when I was at wide open throttle. It eventually got worse as time went on. Turned out to be a dying catalytic convertor from crappy gas. Check into your cat and make sure its not getting clogged.

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Old 06-20-2011, 05:32 PM   #4
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No light, 6spd manual. I only feed this car good gas. Think it would be as simple a that??
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Old 06-20-2011, 05:45 PM   #5
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Yeah, I used to use getty premium in my e36 and it killed the cat by 50k miles. It got so bad that before the cat got completely clogged I could only go 45mph up a hill on a highway. Since then ive used philips 66 premium gas (bmw dealer approved gas) and havent had problems since.

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Old 06-20-2011, 06:03 PM   #6
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Is it a ZHP? My old ZHP used to this until I flashed the DME to the latest software. Even if it isn't a ZHP, first thing I'd try is a DME update.
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Old 06-21-2011, 02:14 PM   #7
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Took the car out today with a fellow enthusiast at lunch and could only replicate the Oscillation in 6th gear at about 3k RPM (80mph). He felt no issues from the clutch or oscillation from the stick. He threw out ideas like limited slip clutch issues or torque converter?
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Old 06-21-2011, 03:53 PM   #8
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Took the car out today with a fellow enthusiast at lunch and could only replicate the Oscillation in 6th gear at about 3k RPM (80mph). He felt no issues from the clutch or oscillation from the stick. He threw out ideas like limited slip clutch issues or torque converter?
You have neither a limited slip nor torque converter. Just do a search for "2800 RPM" and you'll find plenty of people who had the same issue, and in almost all cases it's fixed with a DME software update. Have that done before attempting any other fixes. If the DME update doesn't apply to you, then check your O2 sensors. The DME update normally fixes an issue where the car doesn't handle aging O2 sensors properly. Theoretically, bad O2s would cause similar symptoms even when the DMe is okay.

http://forum.e46fanatics.com/showthread.php?t=558110
http://bimmerfest.com/forums/showthread.php?t=120971
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Old 06-21-2011, 05:21 PM   #9
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I too would suspect a DME update would fix this. However, if you happen to use an oiled aftermarket air filter such as K&N, you may also need to clean or replace your MAF sensor.
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Old 06-21-2011, 05:22 PM   #10
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You have neither a limited slip nor torque converter. Just do a search for "2800 RPM" and you'll find plenty of people who had the same issue, and in almost all cases it's fixed with a DME software update. Have that done before attempting any other fixes. If the DME update doesn't apply to you, then check your O2 sensors. The DME update normally fixes an issue where the car doesn't handle aging O2 sensors properly. Theoretically, bad O2s would cause similar symptoms even when the DMe is okay.

http://forum.e46fanatics.com/showthread.php?t=558110
http://bimmerfest.com/forums/showthread.php?t=120971
This first thread above (last page) chronicles the end of my similar situation with the necessary Bulletin.
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Old 06-21-2011, 06:21 PM   #11
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Thanks guys, would getting a shark inj. work as well to update software, or is it unrelated to a DME update?
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Old 06-21-2011, 06:46 PM   #12
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Is it a ZHP? My old ZHP used to this until I flashed the DME to the latest software. Even if it isn't a ZHP, first thing I'd try is a DME update.
Most likely this is your answer.

If your car has Ms45.1 DME, which it most likely dioes as its a 6 speed , then you need to simply load the latest software update on your car from teh dealer or other capable mechanic.

It could also be the VANOS seals , but we need more details to determine what is it actually , because both can cause similar problems but have a few differences in them.
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Old 06-21-2011, 06:48 PM   #13
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Thanks guys, would getting a shark inj. work as well to update software, or is it unrelated to a DME update?
No. Shark or any other software (AA, ESS) do not replace your existing software, all they do is modify a few files in the software.

Go to the dealer and ask for the latest software that is available for your car.

Which year was it built?
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Old 06-21-2011, 06:53 PM   #14
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Just read the two linked forums (thanks for the links btw) and I'm convinced it's a DME update. I'll take it to the local Indy and get it flashed.

Blocked, it's a 2004.
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Old 06-21-2011, 06:55 PM   #15
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Also, may you all never sell your e46 or leave this forums site, id be lost without you.

Thanks again for the help. I'll post an update when I can get this baby flashed.
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Old 06-23-2011, 03:00 PM   #16
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Got it flashed today. The drive on the FW back to work didn't show signs of the issue. I think my baby is back to normal.

Thanks Blocked Out, Terra Phantm and everyone else who pointed me in the right direction.
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Old 06-23-2011, 03:15 PM   #17
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I was also gonna say that the DISA could be the culprit. There is a flash for that or maybe thats what was done for you. The problem is evident under hard acceleration and occurs around 3750 RPM. The cpu thinks the DISA valve opening is a misfire and retards the timing.
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Old 11-25-2011, 06:35 PM   #18
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Got it flashed today. The drive on the FW back to work didn't show signs of the issue. I think my baby is back to normal.

Thanks Blocked Out, Terra Phantm and everyone else who pointed me in the right direction.
How much were you charged for upgrading the DME?
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Old 11-28-2011, 09:19 AM   #19
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just got mine done a few months back at an indy and it was $75. Same issue and it cured the 2800k hesitation
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Old 10-16-2012, 01:39 AM   #20
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Sorry hermunn123, not sure how I missed your question. I think it was about $80 (sacramento, CA)
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How much were you charged for upgrading the DME?
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