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Engines start but wont rev up

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Old Oct 28, 2010 | 03:02 PM
  #1  
jeeplover1991's Avatar
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From: Apache Junction, AZ
Year: 1998
Model: Cherokee
Engine: 4.0 Straight 6
Question Engines start but wont rev up

I just replaced my engine in my 87 cherokee. its the straight 6. I got it to start and everything but when i push on the throttle nothing happens. does any one have ideas. idk what to do. im only 18 so im not the smartest one jeeps yet but i know my fair share. if you know what is wrong. call me please 480-861-2705 im verizon so if you have it its free long distance and what now. i only have about 4 hours to try and fix it.

heres everything i've done:

-change spark plugs
-checked fuel pump(its good)
-changed fuel filter
-changed computers for my new engine(it was a three year difference)
-timing is on
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Old Oct 28, 2010 | 03:07 PM
  #2  
Diesel's Avatar
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From: Wantage, NJ
Year: 1995
Model: Cherokee
Engine: 4.0 I6
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Throttle cable.
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Old Oct 28, 2010 | 03:19 PM
  #3  
jeeplover1991's Avatar
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From: Apache Junction, AZ
Year: 1998
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Engine: 4.0 Straight 6
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when i push my foot on the gas it moves it
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Old Oct 28, 2010 | 03:23 PM
  #4  
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From: Wantage, NJ
Year: 1995
Model: Cherokee
Engine: 4.0 I6
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What moves. Check the throttle cable at the throttle body, check the TPS.
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Old Oct 28, 2010 | 03:27 PM
  #5  
jeeplover1991's Avatar
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From: Apache Junction, AZ
Year: 1998
Model: Cherokee
Engine: 4.0 Straight 6
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even when i push it down with my hand it still doesnt accelerate. but ill go check those real fast
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Old Oct 28, 2010 | 03:36 PM
  #6  
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From: Apache Junction, AZ
Year: 1998
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Engine: 4.0 Straight 6
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Originally Posted by Diesel
What moves. Check the throttle cable at the throttle body, check the TPS.

how do you check the tps?? certain voltage
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Old Oct 28, 2010 | 05:25 PM
  #7  
Turkey Hunter's Avatar
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From: Lebanon Virginia
Year: 1993
Model: Cherokee
Engine: 4.0
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Even if you push the thing down in front of the throttle body it won't rev up?
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Old Oct 29, 2010 | 11:08 AM
  #8  
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Year: 1998
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no it still ownt. does anyone know what TPS should have for voltage wise?
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