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Unread 10-29-2011, 10:19 AM   #1
giacomo.m
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Join Date: Oct 2007
Location: Italy
Posts: 98
ZJ 4.0 starting problems

Hi all,

I have a ZJ 4.0 1997 with long crank problems,after the third or fourth time the jeep start.
I replaced the fuel pump and pressure regulator, but nothing has changed.
help,help
thank you

Giacomo

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Unread 10-30-2011, 12:30 AM   #2
Oldfrog
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1997 ZJ 
 
Join Date: Feb 2008
Location: Louisiana/Texas
Posts: 3,893
Start by cleaning the throttle body with some spray cleaner. Your IAC may be sticking.

Next time you start it, turn the key to "on" but not start....listen for the fuel pump to run for a few seconds. Then turn it off and do it again....but this time, go ahead and start it.
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Unread 10-30-2011, 02:28 AM   #3
giacomo.m
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Thank you Oldfrog,
so if you tell me what happens is just the throttle body dirty ?
but it could also be a check valve in the fuel pump assembly ?

Giacomo
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Unread 10-30-2011, 10:18 AM   #4
JasonStebbins
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1997 ZJ 
 
Join Date: Jan 2009
Posts: 3,138
Have you replaced the fuel filter? Are the battery terminals tight? Try spraying some carb cleaner in the intake, and like Frog said, clean the IAC. It's very simple to do.

When was the last time you did a full tuneup? Plugs/wires/cap/rotor etc...
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Unread 10-30-2011, 11:20 AM   #5
giacomo.m
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Hi Jason
new fuel filter
battery terminals tight
plugs/wires I replaced a year ago.
thank you

Giacomo
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Unread 10-30-2011, 06:22 PM   #6
Pugulis
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1996 ZJ 
 
Join Date: Aug 2010
Location: Long Island, New York
Posts: 1,034
Just because you replace the wires a year ago, doesn't mean they are not bad. Sometimes cheeper wires can go bad real fast. Let me ask you, did the weather just start to get colder (or even freezing)? This would point me to the wires.
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Unread 10-31-2011, 01:23 AM   #7
giacomo.m
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Hi Pugulis.
maybe you're right, but it seems strange to me.
Now the temperature at night in Rome is about 15/16 ° C
thank you

Giacomo
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