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Re: transmission shudder
Not necessarily. The engine light doesn't always come on when your car has a fault. People tend to be overconfident when it comes to the modern car self-diagnostics capabilities. The truth is that trouble codes are a general guideline as to what direction to take when trying to solve a problem, and not always a definitive indication of a faulty part. I'm not saying this is your case, but generally speaking, you could have a faulty sensor that will never log a code, simply because because you don't drive your car long enough for it to work through its full range and therefore your engine light will never come on. Again, generally speaking, a misfire will log a code if the PCM determines that it's severe enough to damage your catalytic converters, but a poor fuel flow won't log a code unless the PCM detects rpms too low or other components are affected. The fact that you had to replace an O2 sensor could be an indicator that your engine is either running too rich (you'll get a code description along the lines of -O2 sensor switching too slow or unable to switch due to carbon build up) or too lean and the sensor got damaged due to a backfire. I would try and reproduce the fault by loading the car while stationary, let's say, put it in D or R, handbrake on, one foot firmly on the brake and the other one stabbing the accelerator. If you're able to feel a misfire then you can rule out the gearbox. Also, try to pinpoint if the fault happens regardless of engine temperature hot or cold, because again, as a general rule, ignition related problems get worse when the engine gets hotter. These are very general guidelines, so you need to be more specific with your symptoms to give you a more accurate idea of where to look. Hope this helps, cheers
marc
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