cherokeedave2000

My 2000 6 cyl. fuel injected 4.0 Grand Cherokee ran perfect the night before, next morn, preparing for a trip to 6 flags with kids waiting, it would crank but not start, sprayed starter fluid into the butterfly when i turned it over it attempted to start so I'm getting spark. I turned it over while holding the needle open at the elector rail and a solid stream emitted so I'm getting fuel to the injector rail. Could it be that I'm not getting the Voltage pulse to my ejectors ? How do I test for this without a scope. Thanks for any info.
Dave

BlueXJ

ECU is the source and you can get some 'noid lights to see if you aregetting the correct timing of the pulse.

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BuckB91XJ

Also, check out yur (CPS) Crank Position Sensor. That little jewel controls injector pulse and timing. Not sure about a GC but, on an XJ there is an electrical connector on the firewall between the motor and power brake booster. You can read it out with a simple multi-meter. The CPS is actually located on the upper driver's side of your bellhousing. It is a PITA to get to and change but, it can be done with simple hand tools and a little bit of patience.

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Brian Buchanan - US Navy CPO

91 XJ
87 XJ
06 KJ