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1990 4.0l slow to start and rough idle

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Old Oct 29, 2016 | 08:18 PM
  #16  
cruiser54's Avatar
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From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
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same pins probed. Go from idle to full throttle watching the meter needle.
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Old Oct 30, 2016 | 01:27 PM
  #17  
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From: Pasquotank, NC
Year: 1990
Model: Cherokee
Engine: 4.0
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I drove the Jeep to church this morning, ran great! It's still not 100%, but it is close. I think the idle issue last night was burning throttle body cleaner out. Started it this morning and there was no high idle issue. Still a slight surging idle, but no Jeep shaking. I printed out the section of the FSM for testing all of the sensors, will run through those next. Also plan to replace the injectors as I am unsure of their condition and it's a good excuse to upgrade to the 746s.
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Old Oct 30, 2016 | 01:29 PM
  #18  
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From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
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Originally Posted by bad_idea
I drove the Jeep to church this morning, ran great! It's still not 100%, but it is close. I think the idle issue last night was burning throttle body cleaner out. Started it this morning and there was no high idle issue. Still a slight surging idle, but no Jeep shaking. I printed out the section of the FSM for testing all of the sensors, will run through those next. Also plan to replace the injectors as I am unsure of their condition and it's a good excuse to upgrade to the 746s.
Good news. This is what we call progress!!
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Old Nov 8, 2016 | 04:37 PM
  #19  
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From: Pasquotank, NC
Year: 1990
Model: Cherokee
Engine: 4.0
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Have been driving it daily to work for the past week. It drives and idles smooth about 30% of the time. Occasionally the RPMS go up to 1000 in gear, and drop to 400 in gear.

Installed a set of the 746s tonight. A spin around the block revealed a smoother idle, improved throttle response. I'll see if I get better mileage this tank full, last couple have been 13.2 mpg. Something is still not right, has an intermittent issue still.
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Old Nov 8, 2016 | 04:38 PM
  #20  
cruiser54's Avatar
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Joined: Aug 2011
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From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Default

Originally Posted by bad_idea
Have been driving it daily to work for the past week. It drives and idles smooth about 30% of the time. Occasionally the RPMS go up to 1000 in gear, and drop to 400 in gear.

Installed a set of the 746s tonight. A spin around the block revealed a smoother idle, improved throttle response. I'll see if I get better mileage this tank full, last couple have been 13.2 mpg. Something is still not right, has an intermittent issue still.
More progress......Great!!
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