2000 XJ Slow to fire at start

[benspond]

My 4.0L XJ turns over fine but is slow to fire. Has anyone had this problem before?

 

[drew and not u]

Common problem with the 4.0. Waiting for the fuel pump to prime can often help, or installing a check valve in the fuel line to keep fuel from running back into the tank.

 

[multijeep]

hearing any noises at all? check engine lights on?

could be starter, fuel pump, sensor, old plugs/wires/cap, etc

 

[benspond]

No noises at time of turning over. Turns over strong, but is slow to fire. It seems logical that it may be a slow fuel delivery at the start. Once fired, it runs great. If I install a check valve in the fuel line, where do you put it?

 

[Tim Dog]

starting problem

Fuel thing sounds right. I was having the same problem too. I actually changed the coil and that worked. I wanted a hotter spark for my new exhaust system, and tune up. When I took the old coil off I noticed it was cracked. 100k miles it was worth changing. I think it cost about $40 for the accel coil. I you go for it don't forget to order the adapter wires too.
Its worth looking at but priming the pump is always a good idea.

 

[sickpuppy]

I was having the same slow fire problem with my 96XJ and eventually I started having hesitation problems and random cutouts. It was the fuel pump. Mine slowly went out over a period of time.