post #1 of Old 12-21-2008, 01:11 PM Thread Starter
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Location: neenah wi.
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98 cherokee 4.0: low oil pressure and check gauges light

we have a 98 cherokee limited with a 4.0 straight 6, when leaving it idle for a while, the oil prssure guage will drop to almost 0 and the check gauges light will come on, it runs fine and no engine noises. also when driving the jeep, the oil pressure gauge will go well above 40 psi and then at a stop sign it will drop well below 40 almost to 10-15 psi. we did install a new pressure switch a few months back(down by the distributor) we checked it and it is still plugged in tight and not broken off like the old one did, can someone please point us in the right direction as to what we should be looking for? thanks for your time and help, todd in wi.

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post #2 of Old 12-21-2008, 01:51 PM
It's the crank sensor!
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1999 XJ Cherokee 
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Location: Central Minnesota
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The oil pressure sending unit (aka: switch in some parts stores) is located directly above the oil filter, not by the distributor. Still sounds like an oil pressure sending unit to me. You could verify with a mechanical gauge if you're ambitious but if it were me, I'd buy a replacement sender directly from Jeep for best reliability/mating/accuracy with your factory gauge.

99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!
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post #3 of Old 12-21-2008, 04:55 PM Thread Starter
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yes the unit by the filter, we checked into it somemore and found that the harness plugwas not tight onto the sending unit, the replacement unit was from auto zone so we used a few plastic zip ties and fixed it, thanks todd
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