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2001 Sentra problem, trans or engine? shudders or jerks or vibrates while cruising

Hi I have this problem with my Nissan, it is a Sentra 2001 GXE automatic 1.8L, with 140000km on it.

I am very tempted to change the AT fluid and filter, it was already done twice i think, once by a mechanic at 60 or 80K don't remember, the second time was by me at 110K-120K(just the fluid). Before i did my change The RPM at idel were around 1KRPM, once i changed it went down to 0.6-0.7 KRPM, just like when she was new. anyway that's aside from the point.

Now this time it is how to describe, jerky, when on plain road with pedal depressed just enough to keep the 60 or 70km/hr the car feels like it is jerking, ever so slightly back and forth. Oh i know how to describe, when you puke, you get this convolging "bua, bua, bua" and then splat. but less apperant. it goes away if i give it more gas, or remove my foot from the pedal. it is felt more and more by the passing months.

I was trying to think what it can be, possibly dirty throttle or channels, fuel injectors or fuel pressure, idle control, transmission.

The other problem now is that the OD does not kick in untill past65km/ hr, which is strange, it causes high reving period before it goes to higher gear. Anyway my plan for a quick fix is to change the trans fluid. I added a small bottle of trans cure fluid, but i don't think it is doing anything.

Please anyone any experience or ideas what this could be? thanks in advance

Reply to
ipashaev
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It looks as if your engine was hunting at that speed. I would think an vacuum leak or a sticky egr valve could be causing the problem.

Good luck

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Reply to
AS

YES, thank you it was haunting. all of the symptoms lead me to feel something other than the vaccume though. it feels like the overdrive is a bit weaker now after 140K. its like the OD doesn't hold it, like the clutch is not holding the plate well and slipps once in a while(if that makes cense). It doesn't shift up properly and when it is cold then forget about it, unless it wormed up well it will hold the gears longer. well thanks i will see to those vacume lines none the less.

Reply to
ipashaev

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