2007 3.0si intermittent rpm stumble

Cuz5150 · 08-07-2019, 09:52 AM

Hello everyone

My Z4 has developed this engine stumble/hiccup around the 3000rpm range.
This happens on and off. It also throws code P0326 a knock sensor. The car is in great shape with 45K miles. The car gets driven on the weekends.
I have cleaned the MAF, new OE air filter, have run the fuel additives (techron, Lucas and octane boost) have switched the vanos solenoids around.

very frustrated.
When i take it for a spin, it works fine, but as it warms up the cutting/stumble comes in to the picture. However if i park it, shut it down, for 5 min. then restarted.................then the engine runs like a beast

Unreal how powerful and smooth it is through the entire rpm range......

Anyone have run in to this issues that can shed some light?

Im in need of help with this one
Thanks

Huz-Z · 08-07-2019, 01:05 PM

Bad tank of gas perhaps?

Another member here had a similar problem last month and I think it went away after a couple of fill ups.

Our03z4 · 08-07-2019, 11:30 PM

Quote:

Originally Posted by Huz-Z

Bad tank of gas perhaps?

Another member here had a similar problem last month and I think it went away after a couple of fill ups.

Unfortunately my issue is back. Doesn't happen often but I found when it does occur the key is extremely spirited driving to resolve the issue. All the BMW shops can't figure it out. As long as you drive above 3k rpms it doesn't do it.

Efthreeoh · 08-08-2019, 05:12 AM

Maybe one of the knock sensors is bad.

Huz-Z · 08-08-2019, 07:26 AM

Quote:

Originally Posted by Our03z4

Unfortunately my issue is back. Doesn't happen often but I found when it does occur the key is extremely spirited driving to resolve the issue. All the BMW shops can't figure it out. As long as you drive above 3k rpms it doesn't do it.

Excellent - there is nothing wrong after all!

Huz-Z · 08-08-2019, 07:27 AM

Quote:

Originally Posted by Huz-Z

Excellent - there is nothing wrong after all!

kidding above. I wonder if a code reader would shed some light on this?

08-07-2019, 09:52 AM	#1
Cuz5150 Major 215 Rep 1,489 Posts Drives: 06-M3ZHP/04-M3 Vert/02Duc998 Join Date: May 2008 Location: NJ iTrader: (0)	2007 3.0si intermittent rpm stumble Hello everyone My Z4 has developed this engine stumble/hiccup around the 3000rpm range. This happens on and off. It also throws code P0326 a knock sensor. The car is in great shape with 45K miles. The car gets driven on the weekends. I have cleaned the MAF, new OE air filter, have run the fuel additives (techron, Lucas and octane boost) have switched the vanos solenoids around. very frustrated. When i take it for a spin, it works fine, but as it warms up the cutting/stumble comes in to the picture. However if i park it, shut it down, for 5 min. then restarted.................then the engine runs like a beast Unreal how powerful and smooth it is through the entire rpm range...... Anyone have run in to this issues that can shed some light? Im in need of help with this one Thanks __________________ -Diplomacy is saying, "nice doggie while trying to find a rock"- 07-Z4 coupe-Black/Black/6MT/sport/premium/X 04-M3 vert-Black/Imolla/6MT/Cold/Xenon/HK/ 06-M3 Coupe-Mystic/Black/6MT/ZCP/Xenon/HK/ 09-135i- AW/Bk-Lette/6MT/M-pac/Nav/Hi-Fi/Usb-Ipod/SOLD
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08-07-2019, 01:05 PM	#2
Huz-Z Brigadier General 851 Rep 4,057 Posts Drives: Z4 3.0si, 328 XDrive, X5 35i Join Date: Aug 2009 Location: Canada iTrader: (0)	Bad tank of gas perhaps? Another member here had a similar problem last month and I think it went away after a couple of fill ups.
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08-08-2019, 05:12 AM	#4
Efthreeoh General 17315 Rep 18,737 Posts Drives: The E90 + Z4 Coupe & Z3 R'ster Join Date: May 2012 Location: Virginia iTrader: (0)	Maybe one of the knock sensors is bad. __________________ A manual transmission can be set to "comfort", "sport", and "track" modes simply by the technique and speed at which you shift it; it doesn't need "modes", modes are for manumatics that try to behave like a real 3-pedal manual transmission. If you can money-shift it, it's a manual transmission. "Yeah, but NO ONE puts an automatic trans shift knob on a manual transmission."
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