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I Chang a new fuel pump new camshaft new crankshaft still my jeep dont ,start only when I put start fluid then dies what will be the problem ..also when I disconnect and put back the battery the jeep

I Chang a new fuel pump new camshaft new crankshaft still my jeep dont ,start only when I put start fluid then dies what will be the problem ..also when I disconnect and put back the battery the jeep try to start whit out the key on also the IAC make noise

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  • Angel
    Angel Nov 06, 2014

    what you means could be a fault ..the IAC if the IAC is in fault that is why my jeep don't start,,

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  • Cars & Trucks Master
  • 1,243 Answers

Sounds as if the 5 volt system on the ECM is shorted through a sensor. May want to unplug the IAC and see if it will start since it makes noise it could be at fault.

Posted on Nov 06, 2014

  • Adam Scott Roberts Nov 07, 2014

    The Engine control module (ecm) has a 5 volt or 8 volt system that is supplied to several of the sensors as a feed back signal as to where and what the sensors and motors are doing. If one of these sensors shots out or goes bad it shuts down the system which in your case creates a no start condition. It may be the IAC that has shorted or some other sensor. You may even want to check the ASD relay(automatic shutdown ), which is also a common problem on Jeeps.

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SOURCE: 02 camaro wont start fuel pump relay or fuel pump

Take the fuel line off before the filter and turn the key on and see if you get any fuel out of the line. If you don't get any fuel unplug the wire connector to the fuel pump turn the key on and see if you get a hot wire going to the pump. if you get a hot wire then it is your pump. If you do not get any hot wire then it should be the relay.

Posted on Mar 21, 2009

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SOURCE: 1998 Jeep Cherokee cranks but will not start

Mine did the same thing, I also replaced the crank sensor and it did not solve my problem. I replaced the fuel pump relay and it ran fine ever since. Try that, it's a cheap item, and easy install.

Posted on Jun 08, 2009

wracefans24
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SOURCE: 99 Jeep Cherokee Sport, 4.0L -won't start

you need to have it connected to an OBD2 machine and watch if you are missing the cam sensor showing RPMs
or if your missing crank sensors RPMs,
it could be a wiring problem or computer if your seeing the RPMs from both sensors,and the last thing i would check is hooking up a fuel gauge to the reed valve and watch what fuel pressure you have while cranking,if the cam sensor is the culprit it will turn the fuel off after the cranking.

Posted on Jan 12, 2010

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SOURCE: My 1996 Jeep Cherokee Sport dies or will not start when hot.

Sounds like the ignition coil is getting bad.

Posted on Jan 16, 2010

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SOURCE: 92 jeep cherokee 4.0 just stops running, had new

Two items that fail most frequently are the fuel pump (which you replaced) and the crank position sensor (11 o'clock on the bellhousing looking from the rear) That can also give you similar symptoms. Problem is it may give you good readings if you test it while it's working correctly. It's a pain to install and isn't very cheap so, I suggest you get a haynes or chilton manual and a digital multi-meter and follow test procedures before buying anything further. Could be that or just a loose wire somewhere. You can also get a code test done free at most major parts outlets. Won't hurt to have that checked as well!!
Good luck...any questions about specific parts etc, just ask!!

Posted on Feb 13, 2010

Testimonial: "Thanks for the two that answered my question. I had the crank position sensor checked and it showed up bad. I changed it and now it runs great. Thanks"

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Recall DateMAR 04, 2004

Model Affected2004 JEEP GRAND CHEROKEE

DescriptionON CERTAIN SPORT UTILITY VEHICLES EQUIPPED WITH 4.0L ENGINES, THE CRANKSHAFT POSITION SENSOR WIRING INSULATION MAY CRACK AND EXPOSE THE WIRE.

ConsequenceIN THE PRESENCE OF MOISTURE, THIS COULD RESULT IN SENSOR MALFUNCTION, WHICH COULD CAUSE THE ENGINE TO STALL, INCREASING THE RISK OF A CRASH.

RemedyDEALERS WILL REPLACE THE CRANKSHAFT POSITION SENSOR. OWNER NOTIFICATION BEGAN ON MARCH 29, 2004. OWNERS SHOULD CONTACT DAIMLERCHRYSLER AT 1-800-853-1403.

Potential Units Affected14621

NotesDAIMLERCHRYSLER CORPORATION D13

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