Question about 1999 Jeep Grand Cherokee

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99 grand cherokee 4.7 v-8 engine missfires at rpm's under 2000 ran compression check [good] coolant system check [good] obd only one code p0500 vehicle speed sensor changed plugs,checked spark at coils [good] plugs carbon up after or 15 minutes black inside throttle body drained fuel, added clean fuel , gas dryer, and injector cleaner suspect high pressure in fuel rail, but have'nt tested yet try to relieve fuel pressure by disabling fuel pump after disabling pump, engine runs much better, and continues to ru for as long as 4 minutes. car continues to start and run for a few seconds as many times as i tried . could not get it to turn over without starting gave-up trying to run it completley out of fuel plug the relay back in, and runs good until, what? can fuel pressure regulator cause to MUCH pressure? someone said check erg valve, acording to book it does'nt exist on this model also told to check return-line from rail to fuel tank can't find one of those either, only supply line. PLEASE HELP

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  • thesprink Jun 03, 2010

    it was helpful, but I know where t. he pressure regulator is, I found it, but its not in the tank it's in front of the tank. I was currious to the location of the return line, Googled that, it goes from the regulator to the tank, not fuel rail to tank. I appreciate your help, this is a car my son bought and it's been a real pain.

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  • Jeep Master
  • 6,826 Answers

It is most likely the fuel pressure regulator,it will have a vacuum line going to it,make sure it is getting vacuum,and the hose going to it is in good shape.Ether the regulator is bad,or the return line going from the fuel rail,to the fuel tank is restricted.If the fuel tank has not been off the vehicle ,it is most likely the fuel pressure regulator.

Posted on Jun 03, 2010

  • 9 more comments 
  • thesprink Jun 03, 2010

    THANK YOU

    CAN'T FIND YHE LINE GOING FROM RAIL TO TANK, CAN YOU GIVE ME A LOCATION?

    ALSO WHY DO YOU THINK IT KEEPS STARTING BRIEFLY WITH THE FUEL PUMP RELAY DISCONNECTED.

    BOOK DOES"NT SHOW WHICH LINE ON THE REGULATOR IS THE VACUMN.

    LINE BETWEEN RAIL AND TANK,,DRIVERS SIDE ?WAY IN THE BACK? NOT VISABLE.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jun 03, 2010

    The fuel pressure regulator on this vehicle is a dealer item,and I think it is in the fuel line itself,so look at the dealers regulator to know what to look for,or google it,and look at the regulator.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jun 03, 2010

    It keeps running so long because of to much fuel pressure.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jun 03, 2010

    I hope this helps fuel pressure regulator,I will check my manual now

  • thesprink Jun 03, 2010

    THANKS

    it's not only that it runs so long that's puzzling, but after the pressure drops and it dies, it will start and run after that for 5 seconds or so as long as your hand does'nt get tired, or the battery goes dead. I'm talking 20 times. Where is it getting the fuel ? is there a vacumn sucking enough to keep starting it momentarily?

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jun 03, 2010

    No,the pressure is to much,and the fuel is being burned until it is gone,it takes so long because of the fuel the injectors are pulsing is still pressured.I am seaching pdf file now,let you know more in a minute ok?

  • thesprink Jun 03, 2010

    ok thanks

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jun 03, 2010

    Ok ,this is what I found,I was wrong ,on this one,there is only one line on your vehicle for fuel,the fuel pressure regulator is in the fuel tank with the fuel pump,and sending unit.




    These vehicles only run a one-line fuel system meaning that the fuel pressure regulator is part of the fuel sender--

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jun 03, 2010

    You will need a fuel pressure test to be able to tell if the fuel pressure is too high,and from the information I gather ,it is.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jun 03, 2010

    I did my best,I hope this was helpful,and I am positive,the pressure is too high.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jun 03, 2010

    I am so glad,good,,and thank you

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  • Master
  • 10,319 Answers

Check the knock sensor which causes headaches on this model year

Posted on Jun 03, 2010

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