TYPE OF STUTTER/STUMBLE
Steady throttle/Increasing throttle/Both:
MODS
Intake:Stock W BLITZ filter
Exhaust:Stock
Fuel:Stock
Turbo:stock less than 30K
Engine Management: stock
Tuner and revision of tune(if you don't mind):
MAINTENANCE
Sensors changed:
Plugs changed: changed spark plugs and VGC's about 1k ago
OTHER SYMPTOMS:
Only had this car for a few months so I'm still getting a feel for it. The best fuel I can get here is 91. I recieved the car with what I think was a few gallons of 87 and the surge in acceleration was terrible. After getting it filled with only 91 the surge greatly smoothed out but at times I still feel a very light surge/stutter around 75%-WOT. It seems to increase progressively in colder temperatures (30-20° here recently) and occasionally occurs in normal driving at these temps. Assumed ECU pulling timing in response to knock. (normal driving for me has been described by passengers as rather aggressive though so…). Thoughts?
These symptoms have been consistent with one acception, I work on cars for a living and this situation quite confused me, here we go:
Stopped at a gas station abou a mile away from my shop for some snacks on lunch. Turn of car go in come back try to start car, car starts to turn over and quits... Ok try again, starts to turn over stops... Ok make sure my lights (HID's) are off and any other electrical draws are off. Turn key, car fires up as if nothing even happened just like normal, but something felt different, so what does any responsible rational car owner do? Light it up. The weird part was that the little stutter it has on its way to redline was completely gone, and it pulled harder than I'd ever felt it before. Wired right or am I just missing something obvious. Al startups since have been normal.