Oil pressure and a mess of farts!
Thread Starter
Member
Joined: May 2011
Posts: 142
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From: Olympia WA
Year: 1994
Model: Cherokee
Engine: 4.0
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.
Thread Starter
Member
Joined: May 2011
Posts: 142
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From: Olympia WA
Year: 1994
Model: Cherokee
Engine: 4.0
CF Veteran
Joined: May 2010
Posts: 3,405
Likes: 2
From: Fort Collins, CO
Year: 1996
Engine: 4.0L HO
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.
Thread Starter
Member
Joined: May 2011
Posts: 142
Likes: 0
From: Olympia WA
Year: 1994
Model: Cherokee
Engine: 4.0
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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CF Veteran
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From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
Thread Starter
Member
Joined: May 2011
Posts: 142
Likes: 0
From: Olympia WA
Year: 1994
Model: Cherokee
Engine: 4.0
Originally Posted by freegdr
single wire connection i assume check the connection yet?
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Joined: Aug 2011
Posts: 43,971
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From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
And, what brand of oil filter are you currently using?