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Oil Pressure/Over heating highway hill

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Old May 16, 2016 | 07:44 AM
  #16  
syncview's Avatar
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Year: 1996
Model: Cherokee
Engine: 4.0L
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Originally Posted by Jakers
Fuel pressure seems good, its 31-32. When I rev the engine it jumps up to 34-35 but then goes right back down to 31-32



Oil in the engine doesn't seem to run more slowly or quickly than new oil out of the jug. If there is a difference it seems small to me. Here are videos showing the difference. First video is engine oil cold. Second video is engine oil hot-ish (engine ran for about 15min, shut it off, waited 5min then tested oil), third video is oil right out of the jug. Washed my hands with gojo before each testing so there wouldn't be any oil slick left over. Used a zip-tie for the new oil so the results wouldn't be compromised from the dipstick.

Engine oil cold - YouTube

Engine oil hot - YouTube

New oil - YouTube
that fuel pressure is too low, IIRC it should be around 49 psi at idle
confirm with your year specific service manual
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Old May 16, 2016 | 07:55 AM
  #17  
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From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
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Doesn't appear fuel fouled.

How's it smell?
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Old May 24, 2016 | 10:10 AM
  #18  
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Year: 1990
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Engine: 4.0 L
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Originally Posted by cruiser54
Doesn't appear fuel fouled.

How's it smell?
Still smells gassy,maybe it's not as bad as I'm thinking though... I'm more concerned with the lack of power and ticking noise.
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Old May 25, 2016 | 09:10 AM
  #19  
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Year: 1990
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I'm wondering if the low compression is the reason why it struggles with those hills?
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