2000 4.0 misfires - JeepForum.com
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post #1 of 2 Old 08-11-2005, 10:54 AM Thread Starter
joe johnson
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Join Date: Apr 2004
Location: dent. school in mesa az
Posts: 88
2000 4.0 misfires

It misfires only at start up, it actually smokes and trips codes for upstream o2 and map sensor. I have already replaced them and payed jeep 400 bucks and the problem is still there. They are now looking at the wiring harnes saying that it is a short in the wiring somewhere.
any ideas on this?

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post #2 of 2 Old 08-12-2005, 09:20 PM
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2010 JK Wrangler 
Join Date: May 2004
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Posts: 1,224
Well, I just sent mine to the shop for a misfire, and it turned out that we did not have the plug wires all the way on. Might wanna check that first. Although the plugs were properly seated on mine by all appearances and fit, they were not. The 2.5L works great when all 4 cylinders work and not just the 2 I had! Oh yeah, another part of my problem was both of my crankshaft sensors were bad.

1998 TJ Wrangler SE - Stone White, 2.5Ls of screaming lifter clacking power, AX5, 31" BFGoodrich All Terrain T/A KOs

2010 Wrangler Unlimited Sahara - Deep Water Blue, 3.8Ls of oil consuming fury, NSG-370, BFGoodrich Rugged Terrain T/A 265/70/R18s
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