Low Idle 04 5.4
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Joined: Oct 2007
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Low Idle 04 5.4
Hello,
I need help. I changed the plugs on my 2004 F-150 FX4 with 165,000 miles. Immediately afterwards I experienced a low idle problem. After engine warms up, idle is at about 400 rpm in nuetral or park. When I put in gear it drops to 200 rpm and sometimes stalls. Ford analyzer says misfire #8 cylinder. I swapped coils with #7 and reset fault. #8 cylinder misfire came back. So next I put new plug in #8 thinking the plug was bad. Still have low idle problem. Does anyone have any ideas as to what I should try next? Thanks Bill
I need help. I changed the plugs on my 2004 F-150 FX4 with 165,000 miles. Immediately afterwards I experienced a low idle problem. After engine warms up, idle is at about 400 rpm in nuetral or park. When I put in gear it drops to 200 rpm and sometimes stalls. Ford analyzer says misfire #8 cylinder. I swapped coils with #7 and reset fault. #8 cylinder misfire came back. So next I put new plug in #8 thinking the plug was bad. Still have low idle problem. Does anyone have any ideas as to what I should try next? Thanks Bill
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Joined: Feb 2011
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I have a '04 fx4 5.4, with 62000 miles had the same problem. took to dealer they changed plugs, cam phasers, chain tensioners, and power steering pump they broke. truck ran much better for about 10 miles towed it back to them just to find out the fuel pump control module had corroded out and split open shorting it out. its located under the truck by the spare tire. good luck it cost me 2500 bucks but it does run good now.
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