Question about 1994 Jeep Grand Cherokee

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1994 Jeep Cherokee turns over but won't start.

6 cyl. 4.0 L engine. I can turn the engine over but it won't start. Some times it will sputter and almost start but just can't. It use to be hard to start but it would eventually start. It has now progressed to not starting at all. I have replaced the distributor cap and rotor as well as the fuel filter. The plugs and plug wires are only a year old. It has been suggested that it could be the fuel pump, the fuel injectors, or the timing is off. When I went to release the fuel pressure, in order to change the fuel filter, there was no pressure in the line. This leads me to believe it is the fuel pump. Which do you think is the most likely situation?

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  • ling0069 Dec 16, 2008

    Should the fuel pump be running with just the key in the on position? What is the best/safest way to check for a spark at the plugs? If no spark, how can the coil and crank sensor be checked?

  • Richard Scordino May 11, 2010

    You mentioned that you changed lots of ignition stuff BUT, are you getting spark at the plugs?
    If not, check coil and crank sensor. Also, have someone listen under the fuel tank to see if the pump is running when you turn the key on. If so, check the fuel pressure with a gauge at the fuel rail. I don't remember what the reading should be but anything over 30lbs should be enough to start the engine. Check with key on. Be careful when working with fuel lines... fuel can start fires!!



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Pump should run with key on till it builds up pressure. To check coil, hold wire about a quarter inch from block and have someone crank engine. Spark should be strong and bluish (is that a word?) Anyhow, if coil is good, do the same thing again, only with a spark plug wire (any one you can easily reach) PS you did get the firing order right when you changed them? If there is no spark, check :Crank sensor is a bit harder to check.... First, check codes: Turn ign switch on and off three times, leaving it on the third time: check engine light will flash. read as follows: one flash= the number one etc. there is a pause between flashes: one flash, pause, two flashes= the number twelve. Ignore code 55 it just means the computer is finished sending codes. Code 11 is the crank sensor. To further check, disconnect the sensor harness and check for continuity between b&c terminals (connector should be marked) there should be no continuity when checked with an ohmeter between these two terminals. Crank sensor is on the left side of the bellhousing just where it's a real pain to reach it! Harness connector is on the firewall near or below the back of the engine on the drivers side.

Posted on Dec 16, 2008


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