Running weird

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Aug 21, 2010 | 12:23 PM
  #16  
Ok we messed with the vaccume lines, everything is how its sapposed to be, so i am beginning to hope and wonder if its the fuel pump. Sometimes when sitting at a stop light at idle it almost dies unless you hit the gas, Then it comes back. So to me it seems like its not getting fuel but then again i dont know much about vaccume stuff so maybe its that too...
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Aug 21, 2010 | 07:44 PM
  #17  
So could it just be the fuel pump causing this?
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Aug 21, 2010 | 07:58 PM
  #18  
I would first try putting a new fuel filter in, it's cheap and it could be all that's wrong...
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Aug 21, 2010 | 08:34 PM
  #19  
Ok so ya now its starting to die going in a straight line... My dads going to try to get a fuel pressure tester and see if we can figure anything out..
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Aug 22, 2010 | 12:35 PM
  #20  
We blocked off the vaccume goin to the fuel pressure regulator, and nothing changed. Wouldnt that change something like make it better or worse??
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Aug 22, 2010 | 02:34 PM
  #21  
Well now it seems like it might be having low oil pressure.. Hopefully its not gettin ready to die.
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Aug 22, 2010 | 08:06 PM
  #22  
Does anyone have and idea of what it is? this problem is annoying. I doesnt do it once you give it gas it only does it when you let out or sometimes when taking off.
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Aug 23, 2010 | 08:49 AM
  #23  
Wel drove it to school today and it doesnt seem to be doing this. Could it be the coil?
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Aug 23, 2010 | 09:04 AM
  #24  
Quote: I would first try putting a new fuel filter in, it's cheap and it could be all that's wrong...
Fuel filter is in the tank, non serviceable.

Quote: Hi erveryone

I ve got a cherokee from 1997. 4 liter, 6 cilinder, automatic.
I have this problem when I am driving a while. Suddenly the rpm go down and there is no power anymore. I have to press the gas otherwise the engine shut's down. When I turn the engine off and on again the problem is gone for a while.
So it looks loke it is an electric problem too. Sometime it starts after 20 km and sometimes just after 5 km of driving.
does anybody have a clue??
No, it sounds like your Crank Position Sensor. You might also want to have it checked out for spark or fuel delivery problems.

Quote: i would put my money on timing... if i had any.
Almost positive timing is non adjustable.

Quote: Does anyone have and idea of what it is? this problem is annoying. I doesnt do it once you give it gas it only does it when you let out or sometimes when taking off.
Sounds like a MAP sensor problem
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Aug 23, 2010 | 12:40 PM
  #25  
Map sensor? whats that? if you dont mind explaining?
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Aug 23, 2010 | 12:54 PM
  #26  
Quote: Map sensor? whats that? if you dont mind explaining?
your map sensor controls the air/fuel ratio. it works in conjunction with your TPS and a vacuum hose on the intake manifold.
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Aug 23, 2010 | 01:18 PM
  #27  
Thanks for explainin. What would happen if i unpluged this? to see if this is the problem. Would it hurt anything?
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Aug 23, 2010 | 01:26 PM
  #28  
It really depends, it could stall, or it might make it just run obnoxiously lean, smoke and run really really rough.
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Aug 23, 2010 | 01:40 PM
  #29  
So maybe i should just spend the 20 bucks and get the part?
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Aug 23, 2010 | 01:43 PM
  #30  
It really cant hurt
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