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Unread 04-23-2013, 05:24 PM   #1
Candymancan
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1998 ZJ 
 
Join Date: Aug 2010
Location: Virginia
Posts: 3,789
Jeep pops when warming up ?

I dont think i remember my 5.9 poping like this while warming.. I cant tell where its coming from... It doesnt do it when its totally warmed up only when cold. Is it just metal expanding or does this sound like a mini backfire to you ? Like every 10 seconds itll make a ting noise. I have a recorded video if youd like to hear it

Started doing this shortly after i fixed my plenum on my intake manifold.


http://www.youtube.com/watch?v=cC66j...ature=youtu.be

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Unread 04-23-2013, 05:39 PM   #2
AmishFury
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1997 ZJ 
 
Join Date: Oct 2011
Location: Evansville, IN
Posts: 536
take a look at your belt tensioner... if you see it twitch when it makes that noise then something is causing the belt to drag (i had a 96 1500 5.9 that did something similar when the water pump was on it's way out)
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Unread 04-24-2013, 11:23 PM   #3
Candymancan
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any 1 ?
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Unread 04-25-2013, 04:01 AM   #4
a70eliminator
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My 5.9 does that same EXACT! poping noise, I just bought it and was changing fluids and cleaning up engine bay and noticed the poping saound like ever 25-30 seconds like yours, I passed it off as expansion.
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Unread 04-25-2013, 12:54 PM   #5
Candymancan
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1998 ZJ 
 
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Weird... It never used to do that before i took off my intake manifold and replaced the gasket/pan ect.. Oh well, it doesnt do it when fully warmed up but i thought it was wierd as i have never had it do that before.

Does yours do it only when its cold and warming up ?
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2013 6.2 V8 Camaro SS 4k miles
1998 5.9 V8 ZJ 160k miles
1998 4.0 I6 Laredo ZJ 210k miles
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Unread 04-25-2013, 01:04 PM   #6
jm8881
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At first I thought it was your a/c compressor kicking on and off but if it goes away when it warms up so I'm stumped.
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