Oil pressure and a mess of farts!
03-24-2012, 02:43 AM
#1
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Year: 1994
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Oil pressure and a mess of farts!
Ok so I have a small problem well at least it seems like a problem. I have had my Cherokee for about a year I do regular oil changes and up keep. Currently has...
4.0
AX15
Ford 8.8 w/4.88 Detroit locker
6in long arm
and 35's
So now to the problem
Lately I have started doing an average 40 mile (average speed 60mph) round trip 2 to 5 times a week; whereas before no more than 10 a day. I have noticed there is this little sound and drop in power for maybe half a second sounds like air is releasing or something like a belt is slipping which I have come to call Cherokee "farts" also there is something weird going on with my oil pressure gauge. Sometimes it thinks it’s a boost gauge so every time I let of the throttle or punch the clutch oil pressure drops and when i go throttle down it shoots right back up and it has never done this before. So I am just wondering what could be going on??? I attached a video of the gauge doing its thang here (
)
Also under the hood while the cars in idle it sounds like there’s air blowing out of something like a leak which seems to be coming from the vacuum line attached to the rear of the valve cover because when I pinch the line the sound stops. Also when it’s cold it makes a squeak a few times then goes away after 30seconds or so (though maybe water pump but not sure now) Thanks for the help all is appreciated.
4.0
AX15
Ford 8.8 w/4.88 Detroit locker
6in long arm
and 35's
So now to the problem
Lately I have started doing an average 40 mile (average speed 60mph) round trip 2 to 5 times a week; whereas before no more than 10 a day. I have noticed there is this little sound and drop in power for maybe half a second sounds like air is releasing or something like a belt is slipping which I have come to call Cherokee "farts" also there is something weird going on with my oil pressure gauge. Sometimes it thinks it’s a boost gauge so every time I let of the throttle or punch the clutch oil pressure drops and when i go throttle down it shoots right back up and it has never done this before. So I am just wondering what could be going on??? I attached a video of the gauge doing its thang here (
Also under the hood while the cars in idle it sounds like there’s air blowing out of something like a leak which seems to be coming from the vacuum line attached to the rear of the valve cover because when I pinch the line the sound stops. Also when it’s cold it makes a squeak a few times then goes away after 30seconds or so (though maybe water pump but not sure now) Thanks for the help all is appreciated.
03-24-2012, 03:45 AM
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03-24-2012, 04:06 AM
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Year: 1996
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The breather on the rear of the valve cover is probably bad. Otherwise, the oil pressure fluctuation is normal, or at least mine does that so I assume its normal.
03-24-2012, 04:13 AM
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Man I'd kill to see oil pressure like that mine fluctuates as well but between 30 and 40 psi I also figured this to be the norm for the 4.0
03-24-2012, 04:22 AM
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Year: 1994
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Originally Posted by mrfajita
The breather on the rear of the valve cover is probably bad. Otherwise, the oil pressure fluctuation is normal, or at least mine does that so I assume its normal.
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03-24-2012, 04:31 AM
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Year: 1994
Model: Cherokee
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Originally Posted by freegdr
buy a new oil switch located next to filter
03-24-2012, 04:36 AM
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Year: 1994
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Originally Posted by freegdr
wh5y did yo replace it?
03-24-2012, 04:42 AM
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Originally Posted by freegdr
single wire connection i assume check the connection yet?
03-24-2012, 09:27 AM
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Year: 1990
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And, what brand of oil filter are you currently using?
