I have a 2004 jeep grand Cherokee with 4.0l engine. it turns over but wont start? I replaced battery, fuel pump, fuel filter, spark plugs and boots, cam sensor, and throttle positioning sensor. any ideas what else it could be????

 

Since you're just throwing parts at it, throw a crank sensor at it and see what happens.

 

Good one, Busted!

 

Same symptoms... Mine was computer module

 

Do you have spark at the plugs when turning over?

Do you have fuel pressure at the fuel rail with the key ON? There is a test valve that is like a tire valve, you press the center pin and fuel should spray out. You can do a "loan-a-tool" at a major parts store for a pressure test gauge, where you buy it and then return it later, but a quick check is to see if fuel vigorously sprays out.

Does it do anything other than turn over, i.e., spit, sputter, shake?

 

I put a crank sensor, and a coil rail. still nothing

 

it just cranks over and over. but after about 4 or 5 times trying it will finally start and idle at 5oo grand then will stall if you touch the gas pedal. if you get it started and let it run for about 5mins. you can drive it and it runs with out any problems after that and you can even turn it off and it will fire right back up with no issues. it only has trouble when it sits for few hours or longer basically when ever it cools down. any thoughts now?

 

Start by having the battery tested.

 

I got a brand new battery In it.

 

Try this: with the key OFF, press the gas pedal all the way down (or most of the way), then turn the key. If it starts like this, that makes me suspect a leaking fuel injector, or more than one, that is flooding it. It would be good to test the fuel pressure to see if you have a failed regulator.

 

you are going to have to clarify for me... What do you mean by "500 grand".

500 RPM or 5 thousand RPM?

 

I meant 500 rpm

 

Good call, T! Another vote for a fuel issue.



Let us know what you find.