Stumbling/hesitation after Protune

Dallasite335i · 11-23-2015, 08:30 PM

I recently had a stage 2 aggressive Protune. Sometimes my car stumbles and hesitates really badly and sometimes shakes until I let off the throttle. This is not even very hard acceleration or wot but maybe 40-50%. I don't get any codes either. I'm almost certain I never experienced this with the ots map. Cobb told me it is misfiring and to change the plugs. It only has 39k on it. Anybody else experience this?

theweebabySeamus · 11-23-2015, 11:46 PM

I haven't, but if you're at 39k and tuned then the plugs are definitely due.

junniior95 · 11-24-2015, 12:47 AM

Change plugs every 15-20k on a tuned n55. I had the same problem with 20k on my car, changed the plugs and haven't has a problem since. Im now at 48k with a FBO 2011 BMW 335 and have already gone through replacing the plugs twice because of that issue.

Dallasite335i · 11-24-2015, 08:43 PM

I just thought maybe the afr was off at some point in the tune since the ots stg 2 aggressive map doesn't do it. Did you get the Bosch ZR5TPP33S high power plugs?

JamieR · 11-24-2015, 08:54 PM

I think others here got it. Stumbling as in misfires?
Any CEL, any codes? You have air fuel ratio metrics?

Could be a number of things but do as much homework as you can. Then get a list of what all could be causing the issue and work on fixing those issues based on logic (and heavily weight cost).
E.g. replace plugs, maybe Low Pressure Fuel Sensor (if codes dictate), maybe coils...

Then you can move on to more expensive items if problem isn't resolved.

theweebabySeamus · 11-24-2015, 10:31 PM

Quote:

Originally Posted by junniior95

Change plugs every 15-20k on a tuned n55. I had the same problem with 20k on my car, changed the plugs and haven't has a problem since. Im now at 48k with a FBO 2011 BMW 335 and have already gone through replacing the plugs twice because of that issue.

^this. Just gotta think of plug changes at 20-30k as a routine maintenance interval because it is, well tuned.

stari335 · 11-25-2015, 03:08 PM

Try talking to PTF. They would work that out in a heartbeat. May need to send them a log or two.

olivojoe · 12-01-2015, 09:29 AM

Quote:

Originally Posted by stari335

Try talking to PTF. They would work that out in a heartbeat. May need to send them a log or two.

+1

If you had it protuned, have the tuner sort it out, or have PTF hook it up. There are plenty of reviews on here about them, and anyone on here will tell you, Dzenno at PTF is top notch. I had similar issues, and after bringing the gap on my plugs down to .018", it is running good enough for now until I buy the E85 compatible plugs.

snaimpally · 12-01-2015, 07:00 PM

I too experienced misfires after installing a protune. I had the spark plugs replaced and have had no issues since. My suggestion is that you get the plugs replaced. I got Bosch spark plugs from ECS Tuning.

MiamiM3 · 12-02-2015, 12:54 AM

I had an extremely rough idle and low rpm misfires at 44,000 miles, new spark plugs fixed it. They say to change them every 20,000 miles while tuned. I have a PTF tune.

e90ca · 12-02-2015, 02:50 PM

I dont know if I'm having the same issue as you are, but it sounds similar to what I'm experiencing. Whenever I am backing out of my garage or into a parking spot, I can feel the car is hesitating or vibrating (not sure if this is correct word to use for what i'm trying to describe). And it also happens when I'm pulling into my garage as well. This seemed to happen ever since I installed BMS Stage 1 tune. Car has 56k miles now and runs fine overall. I was also recommended by a few shops to replace the spark plugs every 20-25k miles because of the tune, so I'll probably get this done when car reaches 60k and see if it helps.

DrRobert · 12-02-2015, 07:23 PM

Quote:

Originally Posted by Dallasite335i

I recently had a stage 2 aggressive Protune. Sometimes my car stumbles and hesitates really badly and sometimes shakes until I let off the throttle. This is not even very hard acceleration or wot but maybe 40-50%. I don't get any codes either. I'm almost certain I never experienced this with the ots map. Cobb told me it is misfiring and to change the plugs. It only has 39k on it. Anybody else experience this?

What kind of fuel are you using? If you are running pump gas then its probably the plugs as others have said, but if you are running E85 blend it could be caused by that as well (if ethanol % exceeds LPFP capacity).

I learned that from Dzenno at PTF BTW, ditto the other PTF recs above if you can't sort it out.

DrRobert · 12-03-2015, 12:57 PM

Also, this hesitation/stumbling means that your protune is not done yet. I would talk to your tuner and have him dial in your tune until it stops happening.

e90ca · 04-05-2016, 01:41 AM

I just had my spark plugs replaced this past weekend and the stumbling/hesitation issues I was having are now gone. Car runs smooth and fine now.

11-23-2015, 08:30 PM	#1
Dallasite335i New Member 3 Rep 24 Posts Drives: '11 Alpine white 335i Join Date: Feb 2013 Location: Dallas, Tx iTrader: (0)	Stumbling/hesitation after Protune I recently had a stage 2 aggressive Protune. Sometimes my car stumbles and hesitates really badly and sometimes shakes until I let off the throttle. This is not even very hard acceleration or wot but maybe 40-50%. I don't get any codes either. I'm almost certain I never experienced this with the ots map. Cobb told me it is misfiring and to change the plugs. It only has 39k on it. Anybody else experience this?
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11-23-2015, 11:46 PM	#2
theweebabySeamus Captain 376 Rep 902 Posts Drives: M3 Join Date: Jul 2014 Location: Bay Area iTrader: (1)	I haven't, but if you're at 39k and tuned then the plugs are definitely due.
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11-24-2015, 12:47 AM	#3
junniior95 Lieutenant 38 Rep 427 Posts Drives: 2011 BMW 335i Join Date: Aug 2013 Location: Boston iTrader: (0)	Change plugs every 15-20k on a tuned n55. I had the same problem with 20k on my car, changed the plugs and haven't has a problem since. Im now at 48k with a FBO 2011 BMW 335 and have already gone through replacing the plugs twice because of that issue.
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11-24-2015, 08:43 PM	#4
Dallasite335i New Member 3 Rep 24 Posts Drives: '11 Alpine white 335i Join Date: Feb 2013 Location: Dallas, Tx iTrader: (0)	I just thought maybe the afr was off at some point in the tune since the ots stg 2 aggressive map doesn't do it. Did you get the Bosch ZR5TPP33S high power plugs?
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11-24-2015, 08:54 PM	#5
JamieR '08 e93 335i 10 Rep 35 Posts Drives: BMW e93 335i Join Date: Jul 2015 Location: Pittsburgh, Pennsylvania iTrader: (0) Garage List 2008 BMW e93 335i [8.00]	I think others here got it. Stumbling as in misfires? Any CEL, any codes? You have air fuel ratio metrics? Could be a number of things but do as much homework as you can. Then get a list of what all could be causing the issue and work on fixing those issues based on logic (and heavily weight cost). E.g. replace plugs, maybe Low Pressure Fuel Sensor (if codes dictate), maybe coils... Then you can move on to more expensive items if problem isn't resolved.
	Appreciate 0 Quote

11-25-2015, 03:08 PM	#7
stari335 Private 13 Rep 87 Posts Drives: E92 335i Join Date: Sep 2015 Location: Malton iTrader: (0)	Try talking to PTF. They would work that out in a heartbeat. May need to send them a log or two.
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12-01-2015, 07:00 PM	#9
snaimpally Major 136 Rep 1,192 Posts Drives: 2011 335i MT Join Date: Mar 2014 Location: Austin, TX iTrader: (9) Garage List 2011 BMW 335i [0.00]	I too experienced misfires after installing a protune. I had the spark plugs replaced and have had no issues since. My suggestion is that you get the plugs replaced. I got Bosch spark plugs from ECS Tuning. __________________ PTF Map, Pure Turbo Stage 1, GFB DV+, Mfactory LSD, AA FMIC, B12 Pro Kit, M3 FCA, AR DP and Dynavin N6, Mosconi AS100.4, AS100.4, AS200.2, Micro Precision tweeters & woofers, Esotar2 1200
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12-02-2015, 12:54 AM	#10
MiamiM3 Second Lieutenant 32 Rep 205 Posts Drives: 2011 335i E90 AT M-Sport Join Date: May 2011 Location: Sacramento CA iTrader: (1) Garage List 2011 BMW 335i M-Sport [0.00]	I had an extremely rough idle and low rpm misfires at 44,000 miles, new spark plugs fixed it. They say to change them every 20,000 miles while tuned. I have a PTF tune.
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12-02-2015, 02:50 PM	#11
e90ca Captain 82 Rep 671 Posts Drives: 2011 335i M-Sport Join Date: Mar 2007 Location: Pleasanton, CA iTrader: (12)	I dont know if I'm having the same issue as you are, but it sounds similar to what I'm experiencing. Whenever I am backing out of my garage or into a parking spot, I can feel the car is hesitating or vibrating (not sure if this is correct word to use for what i'm trying to describe). And it also happens when I'm pulling into my garage as well. This seemed to happen ever since I installed BMS Stage 1 tune. Car has 56k miles now and runs fine overall. I was also recommended by a few shops to replace the spark plugs every 20-25k miles because of the tune, so I'll probably get this done when car reaches 60k and see if it helps. __________________ 2011 335i with M-Sport Performance package, Carbon Fiber interior trim, gloss black kidney grills. 18" Apex Arc-8, JB4, ETS Charge pipe
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12-03-2015, 12:57 PM	#13
DrRobert Normal Person 148 Rep 862 Posts Drives: 2011 E90 335i Join Date: May 2014 Location: paradise iTrader: (0) Garage List 2011 E90 335i [0.00]	Also, this hesitation/stumbling means that your protune is not done yet. I would talk to your tuner and have him dial in your tune until it stops happening.
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04-05-2016, 01:41 AM	#14
e90ca Captain 82 Rep 671 Posts Drives: 2011 335i M-Sport Join Date: Mar 2007 Location: Pleasanton, CA iTrader: (12)	I just had my spark plugs replaced this past weekend and the stumbling/hesitation issues I was having are now gone. Car runs smooth and fine now. __________________ 2011 335i with M-Sport Performance package, Carbon Fiber interior trim, gloss black kidney grills. 18" Apex Arc-8, JB4, ETS Charge pipe
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