I've looked online and still haunt found a solid answer, but my 90 4.0 jeep runs pretty good but it always takes about 5 sec of cranking before it fires up when its cold. It also takes a bit so start up when warm but not as long. I have new injectors, fuel pressure regulator, cap and rotors. Any ideas? Thanks

 

Plugs, wires, battery.

 

I bought new wires and I think the spark plugs are pretty new, ill try and replace the spark plugs and look into a new battery.

 

Try the newbie "Read this, section" on the first tech or mod page; not to be rude, but I find it helpful when I have any questions/problems.

Again you might find a possible answer or better yet , a diagnostic that will tell you what and how to test. Good luck

 

Had problem with 92xj my mechanic noticed it told there was a bulletin sent out by chrysler now this happened in 01 and I dont know if pertains to you so heres the answer fuel pump not working properly to start engine faster new fuel pump fixed please check around on this and see what YOU find

 

Yeah ill look into that. Thanks.