Question about 2001 Jeep Cherokee

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<!-- from fixya rte -->No oil pressure when idling/stoplight - 2001 Jeep Cherokee

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Take your car home and don't drive it untal you get it checked. You can blow you engine.
1. Check your engine oil level, you may just be low.
2. you don't say what engine so, if you add your oil at a cap on the valve cover warm up the car and have someone remove the cap and look inside with a light as you rev up the engine. they should see oil splashing around. If not shut it off. Could be your oil pump is going out BUT
3. Add a quart of engine flush ( make sure the engine is one QT low on oil don't add to full oil level) Run your engine 5 min with Motor Flush. Then drain oil, replace filter and oil and check your gauge for idle pressure. You could just have a slug clog.
4. If this does not work (I think it will) take it to a friend recommend shop. Hope this helps MIKE

Posted on Nov 29, 2014

  • Tom Nov 30, 2014

    Mike, for many years there has been a oil pressure switch either on or off, on with oil pressure and off with little to none. This switch cuts off the fuel pump to prevent the engine running with no oil pressure.

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What is the mileage on the vehicle? What type of oil are you using, synthetic or conventional oil? Older engines that have a fair amount of wear (loose essentially). I had this problem on two different vehicles. If the oil is not near time to be changed (fairly clean oil) I would get a new oil filter and prepare it by filling it with STP oil treatment. This is thick stuff and will thicken your oil. Remove the old oil filter and put the new one on. Start the engine and let it idle for a minute then shut it off. Check the oil level and add more STP to bring it back up to the full mark. Start it and check the oil pressure. If this helps bring the pressure up then I'd say its time to go to a thicker oil. I switched to 0w40 synthetic after trying 5w30 (5w30 is recommended by mfr.) and have had no more trouble. The thing is that synthetic oil tends to thin more at temperature than conventional oil does.

Posted on Nov 29, 2014

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Is the warning light coming on or do you have a gauge? If you are showing no pressure at low rpms STOP DRIVING it! How many miles - it may simply be time for a rebuild. If not that many miles, confirrm oil pump pickup is clean, check pump and bearing clearances.

Posted on Nov 29, 2014

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