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I have a 98 jeep cherokee sport with a 4.0 i put a fuel pressure guage on it to check the pressure stayed 35-36 psi stayed at this for for 10minutes after i shut it off questioning weather or not its the fuel pump set up.changed crank sensor,throttle position sensor, plugs ,wires cap and rotor.the jeep has had intermittent problems running.i can hear the pump cycle , checked the charging system,good? anyone have any other suggestions. jeep only has 91,000 miles on it?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: 2001 jeep cherokee sport 6 cyl 4 wdr cranks want start

If the data link is not talking to the computer check your ground at the computer and at the data link connector to see if the computer is even alive ground pin 3 on DLC with the key off then turn key to the run position if it flashes the check engine codes record them, if no engine light, does the engine light come on when you turn the key on then go off? if not, check fuses if not check power for pin on computer, if it has power you have a bad computer. But TEST THE GROUNDS IT IS THE BIGGEST FAILURE For these rigs or any manufacture. check that you have power also at the DLC too. if not you need a digital ohm meter and a subscription to http:///.www.alldatadiy.com and start reading the campaigns on that vechile for computer and trouble tree for dead DLC and computer. I don't have that subscription or I could tell you more where to look, if you need anymore help let me know. Also if the crank sensor could cause it not to run the fuel pump but so can the cam sensor. You need to find out if the computer gets it's pulse for the pump at the computer if it does then you need to test them both. There are three wires a ground a colored power wire and a wire to go to the computer you can test these sensors with a meter to see if there is a pulse to each. sometimes the fuel pump gets it's signal from the coil pack so it's important to have the subscription, you can do a search for each item and test them as needed and has a wiring diagram.

Posted on Jul 27, 2009

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SOURCE: 94 Jeep Grand Cherokee is hard to start. If I turn

Has any one soled this yet???????? Because I have the the same prob. but mine is only when it is could out blow 65 it will start but I have to keep my foot on the gas like a carb with no choke

Posted on Dec 27, 2009

  • 5 Answers

SOURCE: My 1996 Jeep Cherokee Sport dies or will not start when hot.

Sounds like the ignition coil is getting bad.

Posted on Jan 16, 2010

  • 1168 Answers

SOURCE: 93 jeep cherokee country 4.0

Hello crichardson.

OK, here are all the things to check for.
Spark on all ignition wires,
compression test all cylinders,
ignition timing,
good fuel(not old or contaminated),
injectors firing (have voltage pulse).

Is the crankcase flooded with fuel? Smell the oil. Drain it if it's full of gasoline and put in fresh oil.

I have seen spark plugs that have been flooded that won't fire, even if they look clean.

If the distributor cap and rotor are old...toss them, they are cheap to buy new. Old ones can crossfire internally and rotors can short to ground.

Putting your fuel pedal to the floor while cranking shuts off the fuel injectors. This is called "clear flood mode"
I am telling you this for two reasons.
One that it may be handy to get it started and two to tell you that a shorted throttle position sensor can cause a no start.

Are there any codes stored in the computer? If there is, start there. It may lead you to your no start issue.

There you are, a few ideas, I hope that one of these helps get you running again.
Thank you for using FixYa.

KL
.

Posted on Nov 28, 2010

  • 18 Answers

SOURCE: 93 jeep cherokee cranks wont start. No spark new

maybe cranksensor

Posted on Aug 31, 2012

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do tell what is reading that.>
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You can mount a fuel pressure guage to the engine fuel rail at its bicycle valve bleeder, with tof see if it has pressure when you first turn on the key to start. You may be able to hear the fuel pump running by listening at the fuel tank fill cap that you would remove for that moment. By turning on ignition to start, not run, you are energizing the fuel pump to bring up pressure that should happen in several seconds. So, check if it gets to normal fuel starting pressure, maybe 45 to 60 psi. Then turn key all the way to run, to get car engine running and watch the fuel pressure to see if it stays pretty constant at that 45 to 60 psi. Turn engine off, and watch how long it takes for fuel pressure to drop, and it should not happen fast but instead over 15 minutes or more. That might indicate your fuel regulator valve isn;t working right.
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Aug 04, 2011 | 1998 Jeep Grand Cherokee

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Whats the fuel pressure on a 1998 jeep cherokee sport 4.0


The fuel pressure should be 45psi as per the manual.But in case if its showing between 35 to 40 psi its ok.But any thing lower then 30 psi is a problem.It can be clogged fuel filter or faulty fuel pump.it has to be checked. --------- Thanks.Helpmech.

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Just replaced the fuel pump in my 2003 Chevy Silverado 1500 4 wheel drive. It now starts, but won't stay running when idling. Any ideas?


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Whats A/C pressures for a 98 Cherokee?


Ambient 21°C 27°C 32°C 38°C 43°C
Temperature (70°F) (80°F) (90°F) (100°F) (110°F)
Air Temperature -3 to 3°C 1 to 7°C 3 to 9°C 6 to 13°C 10 to 18°C
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Compressor 1240-1655 kPa 1380-1790 kPa 1720-2070 kPa 1860-2345 kPa 2070-2690 kPa
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Pressure (180-240 psi) (200-260 psi) (250-300 psi) (270-340 psi) (300-390 psi)

Jul 17, 2009 | 1998 Jeep Cherokee

1 Answer

How do i know if my fuel pump is bad


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1 Answer

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