Question about 1998 Jeep Wrangler

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What is the proper oil pressure for a 1998 jeep wrangler at idle?

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Between 20-30 psi at idle.

Posted on Apr 27, 2010

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Oil pressure gauge not reading on my 1994 jeep wrangler. oil is full just the guage has no pressure and not alot of power


The oil pressure specification for your engine is 13 PSI at idle hot, 37 to 75 PSI at engine RPM higher than 1600. I suspect your oil pressure gauge sender unit or gauge is inaccurate. I would have a known accurate mechanical oil pressure gauge temporarily screwed into the present oil sender unit to verify actual pressure.

If you have the correct pressure I would replace the sending unit first.

Sep 23, 2009 | 1994 Jeep Wrangler

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Oil pressure gauge goes up when car started, but then down to 0


u Have a problem with the oil sending unit. The sensor is located beack right side of the engine block. Take out the switch and make sure u have good oil PSI. Should be 6 psi at idle and around 50 at 4000 RPM. If the presure is ok replace the switch they are very cheap about 20 bucks. Please rate.

Aug 10, 2009 | 1998 Jeep Wrangler

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Describe your 1997 Jeep Wrangler 1997 jeep wrangler 4 cyl idle fluctuates 900 rpm to 400 rpm after warmup no service engine light but check guages light comes on momentarily when rpm gets low and oil press...


The check gauges light is normal because at 400 rpm it isn't running fast enough to build sufficient oil pressure. I am guessing maybe a vaccum leak???

Jul 10, 2009 | 1997 Jeep Wrangler

1 Answer

95 jeep wrangler: gauge indicates 0 oil pressure


Wire on oil sending unit may have fallen off or sensor itself may have gone bad. Check both. If engine has no tapping noises, likely it's not a pressure problem.

Jun 07, 2009 | 1998 Jeep Wrangler

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1998 jeep wrangler starting problems


There are several things you can do if you haven't done so already, Check voltage at ignition coil, as soon as the engine starts to turn over there should be voltage. If not, the crank sensor is not triggering the ECM quickly.... on 98-99 wranglers, this was a problem area. Check terminal connectors at the ECM, clean and secure, another area of concern.The module on the side of the throttle body is the air idle control 'motor' as jeep calls it. Over time they tend to carbon up and it results in bad air/fuel mixture and yet fails to send a fault code, you can remove & clean also the O2 sensor in front of the cat. convertor.remove & clean. Check fuel pressure, you should have some residual PSI. Treat fuel system with a good treatment...I like the Lucas products, their fuel system treatment and injector cleaner burns hot & clean.
I hope these suggestions help...and the wrangler returns to top form...good luck.

May 14, 2009 | 1998 Jeep Wrangler

1 Answer

Oil pressure for my jeep 2002 wrangler


As long as it's not going down, and the engine isnt knocking, you do not have a terrible problem. I have used marvel oil in ones that do this and most times it clears up. If not, change the pressure switch. (Takes a few days before it get's better with mm oil)

Apr 22, 2009 | 2002 Jeep Wrangler

1 Answer

Fluctuating oil press


On a jeep engine I prefer seeing low number above 20, generally a few pounds higher. Do you have any noises from engine (tapping/knocking?) low pressure often indicates bearing wear. If engine was not maintained properly or low quality oil was used, it's possible that there is a carbon buildup on the oil pump pickup screen. Though pan removal is not my favorite afternoon job, it may be a good idea before you have further problems.
At the very least, begin using a good additive to dissolve any debris. Marvel oil works well in doing this but don't expect anything to change right away.If idle pressure drops to 10, definitely have it checked immediately.
good luck

Apr 10, 2009 | 1997 Jeep Wrangler

1 Answer

97 wrangler oil pressure drops when engine is at idle


check the engine oil level... you could possibly need to replace the oil pump soon... if you do not live in a cold climate i would consider using 30 or 50 weight oil. do NOT use that in a cold climate as the oil is like molasses when it gets cold.
that's only temporary. one other thing to consider is a clogged oil filter... when was the last time it was changed ?

Robert

Dec 17, 2008 | 2002 Jeep Liberty

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