QuestionI have a 95 Mitsubishi Eclipse GST. It is completely stock. It bucks violently when I give it more than about a quarter throttle while accelerating, it does it around when boost comes on and at low rpms without any boost. It doesn't do this while cruising and seems less likely to do it immediately after cold starting. When it warms it usually will though.
One thing to note is that the motor is definitely crankwalked. The dealer informed me when I took it there for something else. It has been for years, but still drives.
It exhibits all of the symptoms of crankwalk, including a sticky clutch pedal, particularly after left turns. I bought it at 110k miles, it has 135k now. I have a service receipt from Mitsu complaining of the stuck clutch pedal as early as 50k, they said it was nothing and didn't honor the warranty; now I'm stuck with it. I know it needs a new motor, in the mean time I have to drive it. A couple friends had crankwalked 4G63s before that never experienced the bucking. They guess my problem is probably unrelated.
I have tested the secondary coils and replaced the plugs, not sure what to try next.
AnswerHi, First thing is did this problem start out small but has gradually become worse?
1. (If Yes) I would assume a vacuum leak somewhere
2. (If No)This implies that the severity of this hesitation/jerking problem has remained rather constant. Consequently,the following may be the culprit. A bad TPS/ Throttle position sensor.
3. Bad engine compression! Need to get a compression test.
I hope this all helps please keep me updated and have a great day.
When you get a chance please leave feedback for me again thanks, Kevin
