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Unread 03-14-2012, 08:28 PM   #1
firemedicjth
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2001 TJ Wrangler 
 
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oil pump issue? ...you make the call

After searching the threads, I found one that was close but not quite my deal. At random times (it's happened after starting the motor hot or cold) the oil pressure will fail to come up until I throttle up a little. It will come up from 0 after about 20 or 30 seconds and run fine. It runs fine, oil changed regularly by me. Using a 10w oil.
The other day i noticed that the pressure went to the low end (20ish) and then my temp started rising slowly until finally it pegged. I cranked up the heat (on a 75 degree day) and I had to get out of traffic and the pressure came back up, and subsequently, the temp came back down to 210. Your thoughts would be appreciated. Joe

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Unread 03-15-2012, 07:45 AM   #2
doublins
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Quote:
Originally Posted by firemedicjth View Post
After searching the threads, I found one that was close but not quite my deal. At random times (it's happened after starting the motor hot or cold) the oil pressure will fail to come up until I throttle up a little. It will come up from 0 after about 20 or 30 seconds and run fine. It runs fine, oil changed regularly by me. Using a 10w oil.
The other day i noticed that the pressure went to the low end (20ish) and then my temp started rising slowly until finally it pegged. I cranked up the heat (on a 75 degree day) and I had to get out of traffic and the pressure came back up, and subsequently, the temp came back down to 210. Your thoughts would be appreciated. Joe
1) It would be more likely that overheating caused the oil temp to rise as well, which makes it thinner, so it flows better, lowering the oil pressure- the opposite wouldnīt really happen- if your oil pump stopped pumping oil, your engine would be destroyed before your cooling system was no longer able to stay cool-

2) Oil pressure is usually 0 for a few seconds after starting the vehicle until the pump builds adequate pressure. If itīs taking way longer, I would first consider changing oil filter brands (could have crappy flowback valves in your current brand, causing the filter to drain after engine shutdown), secondly I would use a cheap mechanical gauge w/ 1/8" NPT fitting connected inline with the sending unit with a 1/8" NPT tee fitting to verify pressure at startup, and if that checked out, I would replace the sending unit ($35 at autozone)
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Unread 03-15-2012, 07:59 AM   #3
JBTJ
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Oil pressure sending unit may be faulty. I already had to replace mine, was doing the same thing, and we have the same year JEEPS.
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Unread 03-15-2012, 08:02 AM   #4
guncrazy72
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Originally Posted by JBTJ
Oil pressure sending unit may be faulty. I already had to replace mine, was doing the same thing, and we have the same year JEEPS.
This would be a good place to start. I had the same issues with mine besides the temp gauge. It would be much easier to try than dropping the oil pan.
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Unread 03-16-2012, 08:57 AM   #5
firemedicjth
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so I'm driving in clean air and the temp is perfectly fine. when I get off the interstate it starts to climb. could the fan clutch be going bad. I replaced the water pump, thermostat, and radiator last fall. Got a bum one that failed so just replaced with a new radiator. there doesn't appear to be any leaks that I can find.
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Unread 03-16-2012, 09:24 AM   #6
gmiller0737
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10 weight oil? I hope you mean like 10w30? Most likely is the oil sending unit,Before I condemed the oil pump I would want to verify oil pressure with a mechanical guage.
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Unread 03-16-2012, 09:41 AM   #7
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Unread 03-16-2012, 10:29 AM   #8
firemedicjth
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Thanks for the tips everyone. Yes, it's 10W30. I'll give the OSU a try this weekend and see what it does. Someone else mentioned the overheating issue causing the oil to thin out which dropped the gauge which is why I asked about the fan clutch possibility.
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