Quote:
Originally Posted by MotoX16
Hey guys! I have a track day coming up on the 30th and an issue popped up I need help with asap. The car has been running the same tune for a year and a half now and its been great. Was just working on hood vents when this started, most likely a coincidence.
Under light throttle and low rpms (under 4k), the car is hesitating pretty hard. Kind of jerking/bucking back and forth. Seems to be worse under more load like going up an incline. It seems to be intermittent too, happened two nights ago, couldnt get it to replicate yesterday morning, but then in the evening I was able to capture it in a log.
The log is just me going through gears 1-5 up a gradual hill. I can see in the log where I'm feeling the issue but I'm not sure how to diagnose anything, the rpm's jump back and forth when I'm accelerating. I popped the hood and dont see any loose hoses or connections. Could you please take a look at my data and let me know if anything stands out to you?
Only 36k miles so hoping its not spark plugs
Here's the datazap: https://datazap.me/u/motox16/815-issue?log=0&data=30
Thanks for any help! |
I see a couple misfires occurring right in the spot of RPM fluctuation on cylinders 2 and 3. Your throttle angle is all over the place in these regions of fluctuation with drops in torque demand and various other parameters. I have very little experience in understanding and diagnosing from data logs. But maybe there's something up with the TB or MAF sensor needs cleaning? Maybe an issue with the injectors?