ZJ spits and sputters in hot/wet weather - JeepForum.com

 
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post #1 of 12 Old 10-15-2012, 09:10 AM Thread Starter
BigEag205
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2000 WJ 
 
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ZJ spits and sputters in hot/wet weather

As the title says, after a certain distance of travel, the ZJ will start to spit and sputter in either hot or wet/damn weather conditions from what I've come to notice. It acts like it's getting moisture in the lines or cutting fuel. Seems to be worse under acceleration going up a hill. At first I thought maybe the fuel filter needed cleaned but then I thought that it would be doing that all the time if that were the case. I can make a 70Mile round trip, going up is fine but coming back it will do this. In cold weather I've made a 174 trip no problems...In the heat of the day though is a different story; I've had to pull over and take naps letting it cool back down for awhile. This makes a 3 hour trip into a 5.5 hour trip.
The Jeep doesn't over heat or anything, but once at operating temp for awhile in hot and/or wet/damp weather it does this. Any idea as of what to check? No EVAP system codes or any others are being thrown. I've had it throw a code once while doing it but by the time I got to an autozone/advanced the code was gone...Then I realized it doesn't even seem to have an OBD2

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post #2 of 12 Old 10-15-2012, 10:22 AM
dusterdude
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Distributor cap
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post #3 of 12 Old 10-15-2012, 11:02 AM Thread Starter
BigEag205
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would it not spit and sputter under acceleration all the time? It only does it after a certain distance is travelled and doesn't seem to do it in cooler weather
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post #4 of 12 Old 10-15-2012, 11:15 AM
dusterdude
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Water/condensation can get in a cracked cap and it will run like dog doo until its dried up
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post #5 of 12 Old 10-16-2012, 12:00 AM Thread Starter
BigEag205
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If it were a distributor cap going bad, I'd think it would miss even while at idle and from start up to turn off. I'll check it tomorrow though and post my findings
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post #6 of 12 Old 10-16-2012, 05:57 AM
jtackerman28
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I've had a crack in my old coil that would entirely kill the Jeep on rainy days, or after a nice water fording.

3.5 re lift, double sheer front tb, 31" wrangler duratecs
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post #7 of 12 Old 10-16-2012, 05:24 PM Thread Starter
BigEag205
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Checked the distributor cap. No problems with it. Im leaning towards it being fuel related personally. Any other ideas?
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post #8 of 12 Old 10-16-2012, 05:51 PM
jtackerman28
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Did you pull the coil off of it and look for cracks.....?

3.5 re lift, double sheer front tb, 31" wrangler duratecs
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post #9 of 12 Old 10-18-2012, 03:43 PM Thread Starter
BigEag205
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Quote:
Originally Posted by jtackerman28 View Post
Did you pull the coil off of it and look for cracks.....?
no, i just visually inspected it. I was going to check it today as Im juggling multiple project's right now but it rained. Ill repost when I'm able to tear it off.
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post #10 of 12 Old 10-18-2012, 04:21 PM
errorcode3
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Quote:
Originally Posted by BigEag205 View Post
no, i just visually inspected it. I was going to check it today as Im juggling multiple project's right now but it rained. Ill repost when I'm able to tear it off.
its one of the cheaper repair parts, if you're yanking it off replace it anyways.
cap and rotor.

They can be super picky, i had one that ONLY when it snowed would it act up, rain it didn't throw a fit, but as soon as snow flew it went nuts.

98 - Slate 5.niner. minor mods
02 - Silver Liberty (wives mall crawler)
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post #11 of 12 Old 10-18-2012, 06:09 PM
ratmonkey
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instead of guessing.

how about.
last tune up?
compression?
fuel pressure?
fuel filter last change?
check the PCM for blown caps?
tested resistance of coil?

there's a lot of actual data you can get and compare to find out what's wrong insted of just throwing junk at a dart board.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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post #12 of 12 Old 09-23-2013, 01:19 PM
GoGetEmTurbo
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Did you ever get this problem figured out?It's kind of like an issue I'm having with my 96 5.2L.

Go here to watch my truck burn...
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www.dirtjunk.com
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