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Unread 09-16-2009, 09:32 AM   #1
SteelBlue_WJ
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Rough start, sounds like a diesel after start up until warm..

It was running a bit rough at start, got an oil change and spark plugs changed (and had SP wired inspected) about 300-400 miles ago and still sounds like crap at start up and for first 3 minutes of running, sounds fine after that. is it time for seafoam? 105K ran like a champ until this started happening. Any ideas?

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Unread 09-16-2009, 04:23 PM   #2
EMTimZJ
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Search around for "cracked piston skirt" and see if those types of descriptions match what you are hearing/experiencing.

My sister's WJ 4.slo was making a similar noise, at first it went away when warm, then it only did it under load, then it was all the time and increasingly louder... The skirt finally gave way and disconnected from the rod.
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Unread 09-17-2009, 08:01 AM   #3
SteelBlue_WJ
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I dont hear knocking or ticking I dont think, sounds like its running rich, and the puff of smoke out the exhaust and smell of a carb'ed engine running rich is there when it starts. It's not like that on all starts, just the first one for the day or if it sits for several hours, it may or may not do it for lunch for example but if I went 9 hours it might do it then.

I'll try to get under there this weekend and drop the oil pan to check for chunks.
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2001 Steel Blue WJ Laredo SA 4x4, 3.5" lift, Apperance Package with factory Laredo Steel Blue cladding/leather
Conferr Roof Basket with custom Randy Ellis Design light cage, WAAG grille guard and Hella lots of 500 lights


2004 Wrangler Sport, 2.5" and 31's, nothing special

"For all sad words of tongue and pen, the saddest are these, 'It might have been.' "
John Greenleaf Whittier
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Unread 09-18-2009, 11:17 AM   #4
SteelBlue_WJ
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will sea foam help??
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Bobby

2001 Steel Blue WJ Laredo SA 4x4, 3.5" lift, Apperance Package with factory Laredo Steel Blue cladding/leather
Conferr Roof Basket with custom Randy Ellis Design light cage, WAAG grille guard and Hella lots of 500 lights


2004 Wrangler Sport, 2.5" and 31's, nothing special

"For all sad words of tongue and pen, the saddest are these, 'It might have been.' "
John Greenleaf Whittier
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Unread 09-18-2009, 03:14 PM   #5
comptiger5000
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I don't know that seafoam will help, but it's not gonna hurt.
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Unread 10-05-2009, 11:21 AM   #6
melk
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Any luck SteelBlue? Did you try seafoam?
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Unread 10-05-2009, 07:03 PM   #7
ZeeJay1997
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just for grins, try swapping the fuel pump relay with the horn or int wiper relay.

mine was doing this and fp relay fixed it.
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Unread 10-05-2009, 07:39 PM   #8
ZJWally
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how about the cap and rotor.....mine was doing the exact same thing, had a cracked cap, moisture was buildup and the contacts were severely corroded. check the cap....they're 12 bucks
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