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Unread 10-21-2013, 04:59 AM   #1
Bishie336
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1999 WJ 
 
Join Date: Oct 2013
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Wj cranks and sputters.

Hi,My 4.0 l6 sputters when i attempt to start and cuts off instantly.It started with Intermittent Crank sensor and injector 1 fault codes.It then died completely. I changed the injectors with upgraded 4 hole type and CPK.It jst didnt work.Now the fault codes cant disply coz I had removed the battery terminals.
I realy dnt knw what to do.Can someone assist

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Unread 10-21-2013, 05:22 AM   #2
Duh
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Check fuel pressure. Sputtering often means low fuel into cylinders.
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Unread 10-21-2013, 01:22 PM   #3
new2site
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Your battery's voltage is quite possibly low...it should test at 12.6 resting voltage (not running). These WJ PCM's demand top rate voltage...if it's even on a low side they'll do what yours is doing --engine will crank...but when started will just sputter out. If you have access to another battery from other vehicle with close cranking amp rating give it a shot...don't shut hood while testing this as WJ's have very little clearance between battery and hood (in case test battery is on "tall side")

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Unread 10-21-2013, 01:29 PM   #4
cykaaro
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While in there worth cleaning the battery connectors, ground from battery on the engine side, and engine to firewall. This will just know you're getting a good connection and isn't part of the problem.
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Unread 10-22-2013, 12:15 PM   #5
new2site
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Update?
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Unread 10-30-2013, 12:57 AM   #6
Bishie336
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Thanks for your tip guys.I will try them out.I noticed one more thing though.The NGK spark plugs (#ZFR5N) currently fitted have a gap of 0.90 as opposed to the recommended Champion spark plugs (#RC12ECC- copper plus) which has a gap of 0.36.Could this be contributing to the problem?
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Unread 10-30-2013, 08:34 AM   #7
ChrisHager
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Woah! Definitely re-gap them!
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Your symptoms sounds just like what it does when it's not doing what it should because of how it is.
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Unread 10-30-2013, 01:02 PM   #8
rdkendrick
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CLEANING AND GAPPING (Except HO engines)

The plugs may be cleaned using commercially available spark plug cleaning equipment. After cleaning, file center electrode flat with a small point file or jewelers file before adjusting gap. The Gap specification is 0.035 for the 4.0L engine, and 0.040 for the 4.7L engine.

CAUTION: Never use a motorized wire wheel brush to clean spark plugs. Metallic deposits will remain on spark plug insulator and will cause plug misfire.

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Unread 10-30-2013, 02:27 PM   #9
Jeepforthewin
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Quote:
Originally Posted by ChrisHager View Post
Woah! Definitely re-gap them!
X2!! Gap plays a pretty big role!
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