Question about 2000 Jeep Grand Cherokee

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`i` have a 1998 jeep grand cherokee and it keeps backfiring and running like ****...I had a code po720 but changed the output sensor and the transmission sensor changed the throttle sensor and still same problem ...only now I dont get any codes...anyone know what to do to fix this problem short of sending it to the scrap yard....

Posted by jedd82600 on

  • mike ryner
    mike ryner May 11, 2010

    What size engine do you have? Is backfire out the exhust or intake? Also does it do it under a load or while idling or both?



1 Answer

Bill Boyd

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  • Jeep Master
  • 53,800 Answers

Back firing ( explosions in the exhaust) can be from fuel mixture too rich and unburnt fuel is getting to the hot exhaust
possible causes for that are excessive fuel pressure , leaking injectors ,leaking injector seals
backfiring through the inlet manifold can be calve timing, ---cam advance servo-- valve staying open ---valve clearance , problem hydraulic cam follower , incorrect firing order for the plug wires, crank/cam position sensors or wiring
IN this country there is a joke about jeeps
Santa was late with the presents because he bought a jeep
( jeep add about Santa buying a jeep released by jeep)
Don't send it to a scrap yard as there are people who can fix jeeps

Posted on Nov 14, 2017


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SOURCE: Jeep Hesitates. P0303 code

Check the cylinders Commpression. over 115 psi is good, 120 psi is normal.

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SOURCE: 1998 Jeep Gr Cherokee 4.0

your problem seems to be electical,if so be the case change pickup coil if so equip.

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SOURCE: my 1997 jeep cherokee sport

check the fuel filter and the fuel regulator

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SOURCE: 01 jeep Grand Cherokee transmission problem

Reboot system by disconnecting negative terminal on Battery, with ignition Key on and engine not running, remove terminal for more than two minutes and connect it back, it will spark a little do not panic, and try it again

Posted on Feb 01, 2009


Jeremy Reddick

  • 1902 Answers

SOURCE: I need a new driver door latch for my Jeep Cherokee
Hope this works for you

Posted on Feb 13, 2009

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Has to be on the back of the trans. Output Speed Sensor
Hope you can get it out,without lowering the trans,to clear the floor pan

Put that into your search engine and find what you need.
Sorry I can't give you the exact location down to the inch

Now hope you have a bad sensor
Codes don't tell you, that it is bad,or to replace it

I would drive the vehicle with a scanner on it ,and look at data, or run off the ground, and back probe with a meter or oscilloscope, to test. ( I know you can't do that)

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My 98 jeep backfires and stalls out while driving at normal speeds I have replaced exaust a number of times as well as computer have also changed crank sensor.the shop I take it to insists on telling me...

i had a similar problem with a 1998 grand cherokee 4.0 had a no start condition changed the crank sensor the car started idled fine no codes till you drive it then it was giving p0430 p0460 misfire cylinder 4 and 6 and ran rough no speed didnt make sense ran good before sensor went bad removed new crank sensor on the bottom it has a round cardboard glued to it so it does not go in all the way and get caught by the flywheel and break its for the air gap . paper says it will shear off when you start the car problem was it wouldnt let the sensor go in far enough for the proper air gap so when i re-installed the sensor the second time i held it in with left hand tightened the bolt with right hand started the car and it idled fine again but when i drove it it was fine and no codes

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Trouble Code: P0113 (4.0L L6 VIN S Auto)
IAT Sensor Circuit High Input Print this code dataprint_icon_codes.gif Number of Trips to Set Code: 1
OBD II Monitor Type: CCM Details
Indicators: MIL Details
Trouble Code Conditions:
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Possible Causes:
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Fault code P0720

code po720 is the output speed sensor malfunction

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