Question about 2002 Nissan Xterra

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When engine is warmed up the car begins hesitating

I have a 2000 nissan xterra and it started having a problem all of a sudden. i was driving around & when i was stopped at a stoplight it started idling irregularly, the rpm needle was going up & down then when i tried to go it hesitated - like it wasn't taking gas or something. it would kind of lurch & then pull back with the rpm needle going up & down accordingly. the next day it started up just fine, ran just fine - until the engine warmed up, then same thing, limping down the road - feeling like the car was going die - but never stalled. i have a friend looking at it & he says they've ruled out all the basic easy stuff. they thought it was a sensor, or electrical issue but still haven't pinpointed the problem. ANY IDEAS?????

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  • y_lemire May 10, 2009

    there is no check engine light coming on. i have a car guy friend looking at it & he said they ruled out all the basic stuff, including vacuum, did hook it up to a computer ( not a very sophisticated one) got the code for the knock sensor. i just talked to him yesterday & he said now that the weather is warmer it is barely even starting....

  • jcwu May 18, 2009

    Did you find a solution for this problem? Is it the knock sensor or MAF sensor problem? My xterra is starting to act exactly the same.

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Check your engine vacuum pull off a line near you egr port ..egrs get clogged as well ...test your vacuum you need to be steady close reading near 14in hg
next your oxy sensor could be working but slow leaning out your injectors and also understand that a voltmeter can test your sensors now do not forget about plenum or intake leaks ...if your car has an idle control valve it can be malfunctioning i usually only see them go bad in cadillacs though..

Posted on May 09, 2009

  • kris vis
    kris vis May 11, 2009

    have you checked for a clogged cat? and the #1 oxy sensor you can put a volt meter on the feedback line and rev and see the volts change if it is a slow sensor or not

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Do you have a check engine light come on when it has problems? If so I would check anything that relies on closed loop operation to run smooth. You most likely have a sensor not reading properly. The check engine light is a big indicator in this problem.

Posted on May 09, 2009

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SOURCE: 2000 nissan xterra hesitating when engine is warm

We are having the same problem. We are right now changing the crankshaft position sensor along with the intake and manifold gaskets.

Posted on May 14, 2009

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When engine is warmed up the car begins hesitating


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