Jam Master Jay
NAXJA Forum User
- Location
- Broken Arrow
I'm trying to revitalize a sweet 1991 Cherokee Briarwood. It was running beautifully but after being left for a couple weeks without running it has started a new issue.
When I turn the key it cranks normally, fires off, then dies. It does that each time the key is turned. Giving it throttle can make it run maybe a half second longer.
I have changed the ballast resistor as well as jumpered it.
I have swapped around the fuel pump relays.
Neither changed anything.
I can hear the fuel pump kick on for a second when the key is turned to "on" each time.
There is fuel in the rail. I don't know the pressure but I am going to order a gauge.
The battery is fully charged.
Now for the weird part - I'm not new to XJ's so I immediately thought it could be the Crankshaft Position Sensor so I ordered a new one. In order to install it, I pulled the XJ forward about 20' with my truck. When I tried one more time to start it before changing the CPS it started normally.
Since I had the CPS I went ahead and changed it as a precaution.
After changing it, I tried to start it again and again it started and ran normally. I even took it for a brief drive in the neighborhood. Then I parked it again.
Now it is back to not starting like it had before.
It has a new fuel tank, fuel pump, and fuel filter that I replaced within the last year when I initially got it.
This is my second XJ. I also have a 1990 that I've had for over 25 years. It has a 4.6L stroker in it and is lifted and locked.
This '91 Briarwood was acquired from a friend and I plan to keep it completely stock, if I can ever get it to run reliably. I already deleted the original, terrible ABS system and replaced the alternator in addition to the above work.
Any ideas are greatly appreciated.
When I turn the key it cranks normally, fires off, then dies. It does that each time the key is turned. Giving it throttle can make it run maybe a half second longer.
I have changed the ballast resistor as well as jumpered it.
I have swapped around the fuel pump relays.
Neither changed anything.
I can hear the fuel pump kick on for a second when the key is turned to "on" each time.
There is fuel in the rail. I don't know the pressure but I am going to order a gauge.
The battery is fully charged.
Now for the weird part - I'm not new to XJ's so I immediately thought it could be the Crankshaft Position Sensor so I ordered a new one. In order to install it, I pulled the XJ forward about 20' with my truck. When I tried one more time to start it before changing the CPS it started normally.
Since I had the CPS I went ahead and changed it as a precaution.
After changing it, I tried to start it again and again it started and ran normally. I even took it for a brief drive in the neighborhood. Then I parked it again.
Now it is back to not starting like it had before.
It has a new fuel tank, fuel pump, and fuel filter that I replaced within the last year when I initially got it.
This is my second XJ. I also have a 1990 that I've had for over 25 years. It has a 4.6L stroker in it and is lifted and locked.
This '91 Briarwood was acquired from a friend and I plan to keep it completely stock, if I can ever get it to run reliably. I already deleted the original, terrible ABS system and replaced the alternator in addition to the above work.
Any ideas are greatly appreciated.