I purchased a week ago an '07 335i. 130k miles.
Four days ago I hit the gas pedal to pass someone on a hill and suddenly the car started to shudder like being in 5th gear but doing 20. The shudder does not go away until I restart the car. What I have also noticed is that if I accelerate slowly, no shudder occurs unless 1: I hit something over 90 mph, or 2: if I hit the gas while passing someone. No codes are being thrown, and moreover, I am not finding anything that would indicate any other mechanical problem. Such shudders usually mean a trans. is about to die, but because it resets after startup, that tells me its computer related somehow.
PS: Dropped the car off to fulfill a recall on the airbag sensor. The service advisor tells me that two years ago the car had a code 33 fault.. the turbo waste gates. The extended warrantee expired (130k miles) and poss. Repairs of over $4k.
Then, I asked many members in the forum.
This is one suggestion I think is the most useful: "If we're just throwing out WAGs, the intake valves are dirty."
Solution: You can take it somewhere and "read the codes", but I'm not sure how many indies have a diagnostic system that will run a misfire detection test plan that can lead to the carbon build-up conclusion. BMW's newer versions of ICOM ISTA/D can pinpoint the problem, but that engine with that mileage and symptoms of self-clearing on restart is typical of "coking (another way of describing the carbon buildup on the valves)". Thought maybe the problem is injector or coil. If over 70k, the valves definitely need to be cleaned.
Finally, I purchased an ELM327 Bluetooth adapter and downloaded Torque. With that at least it will point me in a direction to at least start a diagnostic. Once I find out what they are, well move forward.
Got a P0303 code for No.3.
Checked the O2 sensor readings and see nothing there of note. Vacuum and all other items seem within tolerances so me thinks that given the reset aspect that I have either a dirty spark plug or a bad coil...
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