ok so i have a 98 jeep cherokee sport 4x4 having some starting problems
new pARTS:
NEW COIL good spark felt first hand
CAM SENSOR new replaced just bc.
CRANK SENSOR replaced with new when threw a code
PCM IS GOOD
new fuel pump {with 51 psi} threw a fuel pump relay short replaced pcm AND NOW GONE ......
relays are good
timing is correct tdc ect.

when turning on the key fuel pump does not prime and come on i can jump the relay and thats how i get the fuel pressure when turning over sometimes it will back fire could there be an ignition problem? not allowing it to start

 

I'm sorry, but I'm really having trouble following your post.

You said it has "good spark", but then ask about a possible ignition issue. Also, I don't understand "replaced pcm AND NOW GONE ".

Can you clear some of this up, and we'll try to give you a hand?

 

OK sorry about that ..
before I replace the PCM it was throwing a fuel pump short circuit relay code but I'd check the relay and it was good so I replaced the PCM and the code has not came back onand I replace the fuel pump and is pushing goodpsi to fuel rail but when I turn on the key the fuel pump does not prime and come on I jump the fuel pump relay and still no start and Isaid in the previous form that I replace the crank position sensor cam sensor ignition coil and I made sure that the timing was top dead centerI'm kinda lost don't know what to check ur do nextthanks for getting back to me by the way

 

Do you have spark at the plugs or not? Have you tried switching the ASD relay with another one of the relays?

 

??????????????
How are you getting good pressure if you turn the key on and the pump isn't coming on??????
Take a breath and slow down and reread what you write to make sure it makes sence when you are try to explain what it going on. You're not going to get very good answers if you are not clear of the problem.

 

Indeed, this is remarkably unclear.

In a list manner tell us what you've done and what your troubleshooting results were. Don't try to make sentences.

 

You said you replaced the cam sensor. Are you sure you got the firing order right when you put the wires back on the cap?

Looking at the cap from the passenger side fender, number 1 is at the 5 o- clock position. Order is clockwise, 153624.

The popping you mentioned sound like its timing or firing order.

 

hey guys sorry was still trying to figure this site out

oleblue / yes the timing is correct and at 5 oclock at tdc
yes i have spark at the plugs and i switched the relays
i was getting fuel pressure by jumping the fuelpump relay