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4.0 Stutter on Tach

Old Sep 8, 2011 | 10:56 PM
  #16  
94XjSport94's Avatar
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From: Carrollton, GA
Year: 1994
Model: Cherokee
Engine: Inline 6 4.0L High Output
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From what I can tell I don't think one of my valves is burnt but idk without pulling the head. How can I teat my sensors to see if they are fubar?
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Old Sep 8, 2011 | 11:03 PM
  #17  
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From: Nor-Cal
Year: 1990
Model: Cherokee
Engine: The venerable 4.0
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Originally Posted by 94XjSport94
From what I can tell I don't think one of my valves is burnt but idk without pulling the head. How can I teat my sensors to see if they are fubar?
You can test for a burned valve with a vacuum guage... no pulling the head. The symptoms are pretty much as you describe. you can use a mm to test your sensors. Your temp sensors (coolant, Iat) should be high resistance when cold and come down into the hundreds when hot (my Iat hits about 600 and my coolant hits under 200 if I remember right) I think the output on the map should be between 1.5v and 2v at idle. O2 output v should fluctuate every second or two. What am I leaving out? Those are some little guidelines. My renix may operate at different voltage and resistance. I doubt it though. I would definitely hook a vacuum gauge up though.
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Old Sep 9, 2011 | 04:25 PM
  #18  
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From: Nor-Cal
Year: 1990
Model: Cherokee
Engine: The venerable 4.0
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No burned valve for me but... a vacuum gauge will tell you a lot about your engine. I recommend getting one and hooking it up.
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Old Sep 10, 2011 | 07:15 PM
  #19  
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From: Carrollton, GA
Year: 1994
Model: Cherokee
Engine: Inline 6 4.0L High Output
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I keep getting the CEL and i get code 24 which just tells me that the TPS sensor voltage is too high or low. I replaced the TPS today and changed my oil and still have this problem. Anyone got any ideas or suggestion stories or anything? Really getting tired of this BS
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Old Sep 10, 2011 | 08:26 PM
  #20  
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From: Chino Valley, AZ
Year: 1994
Model: Cherokee
Engine: 4.0
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All I can contribute is that a couple of years ago I would get this hesitation and my tach would drop to nothing and then just spring back. Turned out to be my CPS. Never had the problem again. But I didn't have a CEL. Same as yours - '94 sport.
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Old Sep 10, 2011 | 09:31 PM
  #21  
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From: Carrollton, GA
Year: 1994
Model: Cherokee
Engine: Inline 6 4.0L High Output
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Mines relatively new like 2 years or so ill take a look tomorrow
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Old Sep 12, 2011 | 08:07 PM
  #22  
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From: Carrollton, GA
Year: 1994
Model: Cherokee
Engine: Inline 6 4.0L High Output
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It happened again today even with a new TPS sensor (which is the code it gives me) and it stalled in traffic today twice for the first time. Im pretty sure its an Airflow issue but i cant narrow it down tomorrow im going to clean the MAP sensor and the motor for the idle but im pretty much at the end of what i know to do so anything else please
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