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Stock 2002 - 2005 Explorers Questions related to non-modified 2002 - 2005 Explorers and Mountaineers. Problem solving, maintenance, TSB, service bulletins, owner reviews, specifications. Sport Trac and Sport use the 1995-2001 forum.

HELP! 04 4.0 Rough idle/ Misfire?

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Old 09-20-2011, 04:11 PM   #1
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HELP! 04 4.0 Rough idle/ Misfire?


I have a 2004 Explorer XLT Sport with a 4.0 V6. I recently did a bunch of work on it including:

replaced front differential fluid w/ Mobil 1
replaced transfer case fluid w/ Mobil 1
replaced rear differential fluid w/ Mobil !
new Motorcraft air filter
ATTEMPTED to replace fuel filter without success
flushed and filled coolant
new Motorcraft Plugs and Wires

It was running like new for the first 100 miles or so, now it idles rough, stutters when accelerating from idle, and the "service engine soon" light came on.

I scanned the OBD II computer and it came back with:

P0171 Bank 1 system too lean
P0174 Bank 2 system too lean
P0300 Random multiple misfire detected
P0316 Misfire on start up

Anyone have any ideas? I don't know where to start. Thanks!
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Old 09-21-2011, 06:31 AM   #2
02 XLT V8
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does it get better after it warms up? sure sounds like leaking intake manifold gaskets to me.
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