Compression
02-11-2011, 03:31 AM
#1
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Year: 1999
Model: Cherokee
Engine: 4.0L
Compression
My 99 jeep cherokee compression gauge went from high to low and stayed low wondering what may have caused this..??
Last edited by jess_one; 02-11-2011 at 11:53 AM.
02-11-2011, 06:34 AM
#2
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compression gauge? do you mean oil pressure gauge?
or did you hook up a cylinder compression gauge?
or did you hook up a cylinder compression gauge?
02-11-2011, 11:06 AM
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Year: 1995
Model: Cherokee
Engine: 4.0 I6
Does that when its cold and drops when warms up. It takes more pressure to push a more viscous liquid than it does a less viscous.
Mine is 70psi at startup, after about 20 min of driving its a steady 35 at idle.
Mine is 70psi at startup, after about 20 min of driving its a steady 35 at idle.
02-11-2011, 12:26 PM
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Year: 87
Model: Cherokee
Engine: 4.0
Sounds like your oil pressure is on the low side. When you say 0 at stopped. 
I hope you mean when the engine is turned off.
If it is reading 0 while running, you need to first check oil level and the oil pressure sending unit to verify correct readings on your oil pressure gauge. Hook up a mechanical oil pressure gauge to check pressure.
You should never have 0 oil pressure when the engine is running. This will cause major engine damage.
If your engine is really running 0 pressure warmed up you may have either a failing oil pump or other serious problems in the oil passages in the engine, possible excessive clearances.
I hope you mean when the engine is turned off. If it is reading 0 while running, you need to first check oil level and the oil pressure sending unit to verify correct readings on your oil pressure gauge. Hook up a mechanical oil pressure gauge to check pressure.
You should never have 0 oil pressure when the engine is running. This will cause major engine damage.
If your engine is really running 0 pressure warmed up you may have either a failing oil pump or other serious problems in the oil passages in the engine, possible excessive clearances.
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