Question about 1993 Jeep Grand Cherokee

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93 grand cherokee had engine replaced. new engine did not have oil sensor attached. display always shows the sensor is bad and to check the oil. i have attempted 2x to go on long highway trips and between 80 and 100 miles out the engine just shut down while driving at 65 mph. changed engines between the 2 trips. what do you thinmk?

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  • Jeep Master
  • 8,270 Answers

You can defeat the oil level sensor by shorting the connector. Use a thick paper clip or other wire shaped in a "U" to connect the terminals in the plug. For the other problem, we will need trouble codes. Is the engine light on?

Posted on Oct 04, 2010

  • Sann Jun 26, 2013

    no, the engine light is not on.

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1 Answer

1999 jeep grand cherokee.uses alot of gas idals bad.new fuel filter.blowing black smoke.hit the gas.and it will get away from you...need help...


Can be a bad O2 sensor. Check with a scanner which shows live data the 1-1 and 2-1 (upstream) sensors. Good sensors show a rapidly fluctuating voltage from 0.2 to 0.8 V. When the sensor has a steady voltage, then its most probably bad. There is no check engine light and no fault codes set?

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2006 Jeep Grand Cherokee 5.7L engine, Hemi, sensor code P1129


The OBD is not that simple.

All it is saying is that it does not like the air/fuel mixture.
That can be from fouled spark plugs, an open gas cap or other intake leak, a bad O2 sensor, PVC foam on the air mass sensor, throttle position sensor, etc.
It is just like any carb engine when the mixture is bad.
You can't just read a number and know what to replace.
You have to have a feel for the symptoms.
And if there are no other symptoms, it could be the code is simply the only thing wrong.

Personally my best guess would the air mass sensor.
Look the inside of the oil cap. If there is foam there, then there is likely foam in the air mass sensor as well. PVC systems always throw foam into the sensor, and the only solution is to splice longer hoses into the system and into a condenser of some sort. This is worse in northern climates, in the winter. Most cars in cold conditions have this happening all the time. But as long as the light goes off eventually, don't worry about it.

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The original motor in my 93 grand cherokee 5.2L seized in June. I bought a good junk yard 5.2L motor from a 98 Grand Cherokee and swapped over the 93 intake and all related electronics. The engine is back...


are you sure those intakes are inter changeable?
if you still have the 98 intake and your 93 block ,sit there and look for any differences in holes or hole locations.
another way to check is when it is running remove the oil fill cap and see if it stalls or picks up speed.

Nov 21, 2009 | 1993 Jeep Grand Cherokee

1 Answer

93 jeep grand cherokee. just got it running and the engine is running really rough how do I get it to run smoother. It has fresh gas but am worried it sat too long! 8 moths or so. Also the oil pressure...


If you worried about your gas, put in a bottle of sta-bil or ISOheat. This will remove all water and condensation from the gas. I would also replace your fuel filter, spark plugs and WIRES. Check for any vacuum hose leaks, if needed do compression test to verify that your gaskets aren't leaking.

If you have service/check engine light on, have a diagnostic test done to pinpoint the bad sensor or circuit that is setting it off.

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Your VIC doesn't provide you with codes per se, it supplies other information and what you describe here is what should be written on your VIC, "Coolant Sensor Bad." The actual Coolant Sensor runs to your PCM or computer and your check engine light will come on if it runs at or above 5 volts or below 0.1 volts. If the red square on the vehicle layout is illuminated under the hood area, it means that your Coolant Recovery jug is either low on anti-freeze or the sensor next to the yellow filler cap is faulty...meaning you're low on Coolant and the VIC says that the "Coolant Sensors Bad" yet it's the amount of fluid in the plastic bottle next to the passenger side firewall, right in front of your PCM or computer. If you're low on anti-freeze, keep an eye on it, or have the coolant system pressure tested...including the 18 pound cap on the radiator itself. Also check the two wires hooked to the Coolant LEVEL Sensor in the jug with an Ohmmeter and it should be an open circuit if the level is fine, or hardly any Resistance if the level is low, causing that circuit to complete it's ground circuit and thus signaling the VIC through your BCM to turn on. (Body Control Module). The Haynes Manual you will need is # 50025 which encompasses all Jeep Grand Cherokee's from 1993 thru 2004.

~Stillin~

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Just a thought you might want to check the plug that connects the coil to the wiring loom .......maybe some corrosion .

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