Hesitation and bucking

Jacob Bernacki

Jacob Bernacki

Greenie N00B Member
Hey guys, just created an account here. I’ve had a 2010 speed3 for about 3-4 years. It’s full bolt on, tuned by Freektune, and I’ve been noticing a bucking/hesitiation intermittently, on either cruising speeds or light throttle acceleration. Spark plugs are brand new itv22s. Any help would
Be appreciated. I have two data logs here that where I was experiencing this bucking. Thanks
 

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When you say it bolt on are you including IM, exhaust mani, and turbo as those are technically bolt-ons as well.

Did the problem start after you changed the plugs or did you change them trying to resolve the issue? Any other recent work on the car? If so start by checking all the affect areas for their connections.
 
Turbo Xs Catless downpipe, SRI, TIP, Cobb fmic, greddy boost controller, fidanza flywheel, turbo smart bov and cork sport hpfp internals.This winter I had put on a stock ported mani with the egr delete, vtcs delete, catch can, cleaned the valves and rebuilt the turbo. Although the problem was subtle last year, this year its slowly getting worse. Tried replacing the spark plugs, tried a known good maf sensor but it just seems to always come back. It’s super random and intermittent. Just gets annoying when I’m cruising down a highway at a steady speed and getting what seems like a quick misfire
 
I’m not really sure what I’m supposed to be looking at in your logs. Seems perfectly normal to me at first glance unless you aren’t lifting off the throttle and it’s dropping on its own. If that’s the case, I’d check the battery. Low battery will cause throttle cuts like that.


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Solarsurge said:
I’m not really sure what I’m supposed to be looking at in your logs. Seems perfectly normal to me at first glance unless you aren’t lifting off the throttle and it’s dropping on its own. If that’s the case, I’d check the battery. Low battery will cause throttle cuts like that.


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Ya I don’t really know what I’m looking at in the logs either. I’m not lifting on the throttle at all. Was actually accelerating until I needs to shift. I’ll take a look at the battery and the alternator!
 
Where are you sourcing your plugs ?
 
I also have just noticed that my LTFT at idle is 16% and the STFT will sit at 5-6%. Is that not too high for idle?
 
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