DAT240Z Posted September 16, 2003 Share Posted September 16, 2003 I replaced the fuel pump, EUC, disturbater and the car still jerk hesitate. today on my way to work it would run find under 55mph. when i get on the gas it started to jerk, when i exited the highway the car cut off i had to down shift and got off the clutch and it started again but it would jurk and hesitate when i try to give it gas. at one point i was on the gas but could tell the car was not acclerating. I'm stumped as to what my probllem could be. I was thinking of replacing the TPS, not sure but just running out of ideas. My crankshaft pulley fell out a few weeks ago, i remember about two day befor the pulley fell off the car started jerking, I'm not sure if this has anything to do with my problem but, what i wounder is if the bolt was loose those two day when the problem started and if my timming may have jumped. The car ran great before the pulley fell off. Quote Link to comment Share on other sites More sharing options...
Guest Nic-Rebel450CA Posted September 16, 2003 Share Posted September 16, 2003 I wouldnt think that it would be the TPS because I would think a TPS problem would affect anything over a certain RPM range (throttle position), not a certain speed (i.e. you would encounter problems any time the TPS moved into a certain range during acceleration). I would also think that a timing problem would follow the same pattern. Have you checked the timing? Do you have any trouble during quick acceleration or only at speed? Have you checked your spark plugs?[/i] Quote Link to comment Share on other sites More sharing options...
DAT240Z Posted September 16, 2003 Author Share Posted September 16, 2003 Hi NIC I have not check my timming,or my plugs as of yet i would check the plugs today before i leave for work, During quick accelerations i dont notice the car jerking, it does it mostly at speed, when i drive in town the car does not jerk. Yesterday was the frist time it did a lot of jerking all though the driving range and the was after i got off the highway, where it did a lot of jering while i was driving. Last night when i left work the car ran great at low speeds 50 or below when i would try to acelerate from about 55mhp the car jerked alot when i back off the gas ti settled down and run fine. Quote Link to comment Share on other sites More sharing options...
Guest Nic-Rebel450CA Posted September 16, 2003 Share Posted September 16, 2003 You keep describing this as more of a jerk than a stumble or engine problem. Are you sure that this trouble is from your engine? A shaking or jerking at or above a certain speed is normally a tire coming apart or wheel out of balance. Quote Link to comment Share on other sites More sharing options...
DAT240Z Posted September 16, 2003 Author Share Posted September 16, 2003 I'm sure it the engine maybe jerking is not the right term, but it not my tires, if stumbling is when the car lunches than that is what I'm trying to discrabe. Its like when you hit the rew limiter and the car seams to fall on it face. Quote Link to comment Share on other sites More sharing options...
Z-Gad Posted September 16, 2003 Share Posted September 16, 2003 I had a similar problem w/ my daily driver a couple of years ago. It reminded me about it since it started when the crankshaft pulley came loose and it only happened under load. If you put the same pulley back on, check to see whether it is loose again. You might want to try taking it off and checking the keyway, the pulley and the keyway hole in the crank for wear. My keyway and pulley were toast!! Also, another place to check may be your fuel filter... Quote Link to comment Share on other sites More sharing options...
DAT240Z Posted September 16, 2003 Author Share Posted September 16, 2003 My pulley got borken when it fell off so did the keyway, I replaced the pulley and keyway with on of a 280zx. Quote Link to comment Share on other sites More sharing options...
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