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  #1  
Old 05-08-2012, 04:06 PM
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jeep cranks sometimes and then finally starts

from time to time ive been getting in the jeep and it just cranks and then finaly it starts. i dont want this to leave me stranded on the road so any sugestions would help. im thinking maybe a crank position sensor??? thanks
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Old 05-08-2012, 07:01 PM
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Re: jeep cranks sometimes and then finally starts

check for any codes by doing the key trick.

Chech the connections at the ECU under the hood (passenger side firewall) Make sure everything is fully seated and tight.
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Old 05-09-2012, 08:20 AM
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Re: jeep cranks sometimes and then finally starts

no codes and everything looks tight
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Old 05-09-2012, 09:08 AM
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Re: jeep cranks sometimes and then finally starts

Starter?
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Old 05-09-2012, 09:13 AM
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Re: jeep cranks sometimes and then finally starts

if it takes a long time to start, ie cranking a long time and then finally fires up. usually thats an indication to a clogged fuel filter. i would replace that first and see if the problem persists.
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Old 05-10-2012, 07:54 PM
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Re: jeep cranks sometimes and then finally starts

Quote:
Originally Posted by Antonio186 View Post
if it takes a long time to start, ie cranking a long time and then finally fires up. usually thats an indication to a clogged fuel filter. i would replace that first and see if the problem persists.
I doesnt happen every time though. isnt the fuel pump and filter one unit in the tank?
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Old 05-10-2012, 08:26 PM
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Re: jeep cranks sometimes and then finally starts

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Originally Posted by wkjeepgirl86 View Post
I doesnt happen every time though. isnt the fuel pump and filter one unit in the tank?
not sure if it is on the wk? or a seperate unit. maybe some WK guys could chime in and clarify on that. im basing my diagnosis on general mechanic experience.
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Old 05-10-2012, 11:59 PM
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Re: jeep cranks sometimes and then finally starts

hi wkgirl86, thats a very common thing on the 5.7. happens on mine from the first day on. but only about 2-3 times a month. does it happen with yours more often??
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Old 05-24-2012, 04:48 PM
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Re: jeep cranks sometimes and then finally starts

ive never had it happen untill recently so thats why im trying to figure out whats wrong
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Old 05-24-2012, 05:14 PM
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Re: jeep cranks sometimes and then finally starts

early stage of a sensor misfiring. Find out which one asap this
happened to me on a chrysler 300 i use to own
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Old 05-24-2012, 08:50 PM
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Re: jeep cranks sometimes and then finally starts

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Originally Posted by jrjeep View Post
early stage of a sensor misfiring. Find out which one asap this
happened to me on a chrysler 300 i use to own
thats what im trying to do but no one seems to know and i dont have a code
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Old 05-24-2012, 09:43 PM
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Re: jeep cranks sometimes and then finally starts

Seeing as yours is an 06 do you still have the factory battery?

If yes, you probably need a new battery. The HEMI is sensitive to voltage issues.

Are your battery connections clean and tight? Are they also good in the Power distribution block (first black box under the hood nearest the battery) it has a big red terminal inside?

If yes to the above, I'd replace the crank sensor.

Your fuel filter and regulator are all in the fuel hat/basket and are replaced as a unit. If you have a mechanic friend you can have them check the fuel pump wave pattern to look for issues. I would go to the battery or crank shaft sensor first though.

If you had fuel issues it would be throughout the operation of the vehicles RPM range.
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