Cranking/Starting Problem - JeepForum.com

 
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post #1 of 4 Old 04-29-2012, 10:10 AM Thread Starter
chadandloren
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2001 WJ 
 
Join Date: Apr 2012
Location: Katy
Posts: 96
Cranking/Starting Problem

I have a 2001 Jeep Grand Cherokee 4x4 with 4.7L. I am having problems getting my Jeep to crank.

Details: The jeep will crank eventually and once running, it runs until I turn it off or run out of gas. The jeep runs great once its running.

Ways to get it to crank: 1. try iginition for about 1-2 minutes with pumping accelorator. 2. turn key one time and then off and turn key again will start vehicle on second time always. 3. leave key on for about 20-30 seconds and eventually cranks.

Things replaced: spark plugs and injectors.

Any ideas on what could be the problem and how to go about fixing it?

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post #2 of 4 Old 04-30-2012, 05:33 PM
neonhomer
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1996 ZJ 
 
Join Date: Sep 2010
Location: Edgewater, FL
Posts: 471
First off, "pumping" the gas pedal does nothing on a fuel injected vehicle. I take that back, if you hold it to the floor, it puts the PCM into a "fuel clearing mode". IIRC....

Almost sounds like maybe you are having a fuel supply problem. Once the vehicle runs, can you shut it off and be able to start it back up within a couple of minutes?

---------------
NeonHomer
Mid-Florida Jeep Club - Member
1996 Jeep Grand Cherokee, 4.0L/42RE/242 - Rebuilt motor w/ Comp cam (4/12), 3.5" Junkyard F>R lift, 31x10.5.x15 M/T's, Spartan Locked D44a, TC & tank skids, F&R adj trackbars, V8 steering arms
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post #3 of 4 Old 05-02-2012, 12:40 AM
lauderdalechad
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2006 WK 
 
Join Date: Mar 2010
Location: Freeport
Posts: 355
If its actually cranking but not starting its most likely your fuel pressure regulator or filter (I believe the filter has a check valve in it). The problem is that once you shut the vehicle off all of the gas drains back out of the line instead of staying "primed" like its supposed to, so it takes a min to refill the lines and get the gas back up to the injectors

2000 jeep wrangler sport: 31" BFG ATS, auto - wrecked
1997 jeep grand cherokee: stock - gf's zj
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post #4 of 4 Old 05-05-2012, 04:12 PM Thread Starter
chadandloren
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2001 WJ 
 
Join Date: Apr 2012
Location: Katy
Posts: 96
Thanks guys! I replaced the fuel filter which was the easier and cheapest and it seems to like new again. Thanks for all the help!!!
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