Partial acceleration miss/stutter

Quick335XI · 08-24-2021, 05:20 PM

Hi, I’ve been having a very frustrating miss or stuttering /miss/cutting out and jerking for months now. The car runs amazing under WOT and idles smooth as silk. It only happens when partially accelerating. It doesn’t happen all the time. So, it’s very difficult to figure out even after multiple people and my tuner have looked into why.

Has anyone else had this? I’m grateful it runs like a bat out of hell under wot, but it’s annoying when driving around town for a while. Any suggestions would be appreciated. Also no codes are thrown and logs are clean. Injectors are about a year old, plugs are good and Eldor could.

michaelalex17 · 08-24-2021, 05:58 PM

Quote:

Originally Posted by Quick335XI

Hi, I've been having a very frustrating miss or stuttering /miss/cutting out and jerking for months now. The car runs amazing under WOT and idles smooth as silk. It only happens when partially accelerating. It doesn't happen all the time. So, it's very difficult to figure out even after multiple people and my tuner have looked into why.

Has anyone else had this? I'm grateful it runs like a bat out of hell under wot, but it's annoying when driving around town for a while. Any suggestions would be appreciated. Also no codes are thrown and logs are clean. Injectors are about a year old, plugs are good and Eldor could.

I had the same symptoms and ended up being the injectors but you said you changed them recently. Are you able to post the log?

pysical · 08-24-2021, 08:06 PM

I had same issue. It was a vanos issue due to the ported head. I went through 2 tuners before going to Motiv who was able to fix it completely in I think 2 or 3 revisions.

Quick335XI · 08-24-2021, 09:59 PM

Interesting because this is a race ported stage 4 head…

Quick335XI · 09-01-2021, 08:50 PM

Quote:

Originally Posted by pysical

I had same issue. It was a vanos issue due to the ported head. I went through 2 tuners before going to Motiv who was able to fix it completely in I think 2 or 3 revisions.

Thank you so much… I told your reply to my tuner and he made some canoe changes. Cwr is running like a dream!! We had been chasing this problem for MONTHS.

08-24-2021, 05:20 PM	#1
Quick335XI First Lieutenant 123 Rep 338 Posts Drives: 2010 335xi Join Date: Dec 2017 Location: Dallas iTrader: (0)	Partial acceleration miss/stutter Hi, I’ve been having a very frustrating miss or stuttering /miss/cutting out and jerking for months now. The car runs amazing under WOT and idles smooth as silk. It only happens when partially accelerating. It doesn’t happen all the time. So, it’s very difficult to figure out even after multiple people and my tuner have looked into why. Has anyone else had this? I’m grateful it runs like a bat out of hell under wot, but it’s annoying when driving around town for a while. Any suggestions would be appreciated. Also no codes are thrown and logs are clean. Injectors are about a year old, plugs are good and Eldor could. __________________ 2010 335XI, Carillo Steel rods, JE pistons, Closed Deck, Stage 4 race heads, 6mt, Pure Stage 2 High Flows, B58 Coils, VRSF\|Vu Brothers (Ft Worth, TX)\|JSRTuning, https://youtube.com/channel/UC_kL3RvFSGv9QmTVt6787gg
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08-24-2021, 08:06 PM	#3
pysical Captain 135 Rep 713 Posts Drives: 2009 335xi Join Date: Feb 2016 Location: Laurel MD iTrader: (1)	I had same issue. It was a vanos issue due to the ported head. I went through 2 tuners before going to Motiv who was able to fix it completely in I think 2 or 3 revisions.
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08-24-2021, 09:59 PM	#4
Quick335XI First Lieutenant 123 Rep 338 Posts Drives: 2010 335xi Join Date: Dec 2017 Location: Dallas iTrader: (0)	Interesting because this is a race ported stage 4 head…
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