krakhedd
NAXJA Forum User
- Location
- Buffalo, NY
This is gonna be a bit long-winded but I dunno what else to check:
2000 XJ Classic
4.6L stroker
stock ignition
~24lb injectors, fuel system otherwise stock (brand new fuel rail too)
800CCA battery, ~200A Ohio Generator alternator (both >1yr)
HESCO high-flow water pump & 3-core radiator, stock fans & thermostat
This all started around 3-4 weeks ago, when the weather (temporarily) got really hot (mid-80s to low-90s). I would start the Jeep in the morning with only a little hesitation (more turns required to get it started), then once running, it ran great. When I would turn it off however, it would need to sit before starting again (I thought initially I had vapor lock).
However, sometimes it would start up again <30min later, sometimes it would require several hours. Just about every time, it would take some work to get running. Sometimes "pumping" the gas pedal (a la carburetor) would help things along, but more often than not, it is just stuck not running for awhile.
I have a friend who is a Chrysler mechanic, he has access to the factory service manual & handheld scanner, etc. He is not able to "talk" to any of the modules (except the airbag module) w/ his handheld scanner, not at all. I do not have a check engine light, but the airbag light does turn on & off (suggesting a loose wire/bad ground/etc). This started around the same time as the starting issue. Also the cruise control doesn't work at all, and also started around the same time.
We have checked voltages on all the related wires from the PCM and everything appears fine. However, when the problem is prevalent, upon turning the ignition the starter engages, but there is no fuel pressure (confirmed by disconnecting the fuel line from the fuel rail). There also appears to be no spark, confirmed by pulling one plug along w/ the coil pack & touching the plug to ground while observing for spark. So, it's almost like the computer isn't telling things to turn on (ignition & fuel systems), even though the key is turned, and the starter engages!?
We are at our wits' ends in regard to what's going wrong, and how to fix it. I could wire the fuel pump relay directly to switched power, but then there's still the question of ignition.
Does anybody have any advice they can give me on this? I would certainly appreciate it, as I need a reliable Jeep not one that strands me sometimes for 30min and other times for up to 5hrs (or, even better yet, a Jeep that doesn't leave me stranded at all!).
Thanks a ton in advance.....
2000 XJ Classic
4.6L stroker
stock ignition
~24lb injectors, fuel system otherwise stock (brand new fuel rail too)
800CCA battery, ~200A Ohio Generator alternator (both >1yr)
HESCO high-flow water pump & 3-core radiator, stock fans & thermostat
This all started around 3-4 weeks ago, when the weather (temporarily) got really hot (mid-80s to low-90s). I would start the Jeep in the morning with only a little hesitation (more turns required to get it started), then once running, it ran great. When I would turn it off however, it would need to sit before starting again (I thought initially I had vapor lock).
However, sometimes it would start up again <30min later, sometimes it would require several hours. Just about every time, it would take some work to get running. Sometimes "pumping" the gas pedal (a la carburetor) would help things along, but more often than not, it is just stuck not running for awhile.
I have a friend who is a Chrysler mechanic, he has access to the factory service manual & handheld scanner, etc. He is not able to "talk" to any of the modules (except the airbag module) w/ his handheld scanner, not at all. I do not have a check engine light, but the airbag light does turn on & off (suggesting a loose wire/bad ground/etc). This started around the same time as the starting issue. Also the cruise control doesn't work at all, and also started around the same time.
We have checked voltages on all the related wires from the PCM and everything appears fine. However, when the problem is prevalent, upon turning the ignition the starter engages, but there is no fuel pressure (confirmed by disconnecting the fuel line from the fuel rail). There also appears to be no spark, confirmed by pulling one plug along w/ the coil pack & touching the plug to ground while observing for spark. So, it's almost like the computer isn't telling things to turn on (ignition & fuel systems), even though the key is turned, and the starter engages!?
We are at our wits' ends in regard to what's going wrong, and how to fix it. I could wire the fuel pump relay directly to switched power, but then there's still the question of ignition.
Does anybody have any advice they can give me on this? I would certainly appreciate it, as I need a reliable Jeep not one that strands me sometimes for 30min and other times for up to 5hrs (or, even better yet, a Jeep that doesn't leave me stranded at all!).
Thanks a ton in advance.....