Question about 1990 Jeep Cherokee Limited

3 Answers

Jeep will NOT start cold or hot without priming.

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  • jmack57333 May 29, 2011

    I have already checked the fuel pump its GOOD & i've replaced the fuel filter plug&wires&ign switch. butit will not start without priming.

  • jmack57333 May 29, 2011

    DON'T YOU ALL READ MY ??? i've already checked all the fuel system. it's GOOD ign switch is GOOD new fuel filter &plugs&wires what can make it have to be primed everytime to start?????/

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3 Answers

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  • Jeep Master
  • 5,370 Answers

Get the injectors checked and the sensors checked.The crankshaft sensor and camshaft sensor checked.Also check the temperature checked.
If the sensor is reading the wrong values then it will lean out the fuel system by shutting injectors off and this will cause the problem.But when you prime the system the injectors remain on and injectors pulse starts and this starts the engine.-
Get three sensors, the crank shaft, cam shaft and temperature sensor checked and injectors checked.If injectors are cracked blocked or not getting required power, it will cause the problem.
------------ This will help.thanks.Helpmech.

Posted on May 29, 2011

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  • Jeep Master
  • 14,036 Answers

IF YOU HAVE TO PRIME ENGINE TO GET IT CRANKING.YOU HAVE LEAN FUEL MIXTURE.CHANGE FUEL FILTER AND CLEAN FUEL INJECTORS.IF ENGINE STILL DONT CRANK YOU HAVE FAULTY FUEL PUMP.CHECK FUEL PUMP FUSE AND RELAY.IF YOU HAVE CARBURETOR AUTOMATIC CHOKE STUCK OPEN.CARBURETOR NEEDS TO BE CLOSED WHEN YOU FIRST COLD START VECHICLE.MAKE SURE SPARK PLUGS AND WIRES OKAY.VECHICLE NEED GOOD CRISP STRONG SPARK ON START UPS.

Posted on May 29, 2011

  • 1 more comment 
  • Jonah Oneal May 29, 2011

    DO YOU HAVE 2 BARREL CARBURETOR OR FUEL INJECTION CONTROL.

  • hippie1255
    hippie1255 Feb 21, 2013

    fuel pressure regulator

  • hippie1255
    hippie1255 Feb 21, 2013

    fuel pressure regulator

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  • Master
  • 3,530 Answers

Welcome to Fixya

Looks like that the engine lacks of fuel pressure. You might need to replace the fuel filter if you haven't change it. Test the fuel pump also. See rocedure below:

Take off the fuel cap and listen closely for the fuel pump to come on as a helper turns on the ignition key. The pump runs for only 2 seconds at a time when the engine is not running. The computer shuts the power off to the pump if it does not see a signal from the crankshaft sensor.

Have the helper turn on the key for 3 seconds and off for 5 seconds and on again a couple of times. If the pump cannot be heard, then replace the cap and lift the hood. Check to see if the fuse to the fuel pump is good. If so, then look to see if fuel is the problem by removing the cap on the Schrader valve on the fuel rail on top of the injectors. Take a small screwdriver and push in on the Schrader to see if fuel comes out in force. If not, hold the Schrader in and have the helper turn the key on. Be ready to release the Schrader if there is fuel pressure, for it will come out fairly steady. If there is no pressure, replace the cap and check the relay. Remove the relay and test the terminals that it was plugged into for power with the key off. There should be one terminal with power. If not, there is a bad wire under the fuse block to the battery; it should have constant power at one terminal.
To be absolutely sure, raise and support the back of the Jeep on jack stands, unless the height allows you to crawl under the back without raising it. Unplug the fuel pump connector at the back of the fuel tank. It will be easy to find and has four wires in the connector. Use a circuit tester and test the harness side for power as your helper turns the key on and off. Remember that there will be power for only 2 seconds, so have your helper cycle the key on and off as you check the terminals, allowing 5 seconds between cycling for the computer to reset. If there is power, the fuel pump took a dump and needs to be replaced. If there is no power, there is an open in the harness to the pump from the fuse block. Thank you for using Fixya!

Posted on May 29, 2011

  • Dylan Wilmott
    Dylan Wilmott Jan 23, 2012

    could be corrosion on a starter wire causing in sufficient cranking speed/power resulting in the need for the extra fuel to turn the engine over properly

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