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post #1 of 17 (permalink) Old 03-22-2014, 07:34 PM Thread Starter
 
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advice on rough idle

Hi everyone my truck is a 07 harley 5.4 she has 165000k bought her with 125000. I do reglar oil changes with mobil 1 5w20 and motorcraft filters. Now the truck is idling a little rough truck drives great lots of power just idles rough no codes or engine light i have scanned the truck. Any advice help or suggestions would be greatly appreciated
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post #2 of 17 (permalink) Old 03-22-2014, 10:25 PM
 
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clean the IAC



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post #3 of 17 (permalink) Old 03-23-2014, 10:52 AM
 
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clean the throttle body and mass airflow sensor..

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post #4 of 17 (permalink) Old 03-23-2014, 02:52 PM
 
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Plugs? Dirty fuel injectors?

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post #5 of 17 (permalink) Old 03-23-2014, 07:10 PM Thread Starter
 
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I changed the plugs 15000k ago but i used champion not sure if it was a good idea to use them
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post #6 of 17 (permalink) Old 03-23-2014, 10:05 PM
 
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Champion makes plugs? Have you pulled any plugs to see how they look? Has this just started or ongoing for awhile now? Bad gas?
Factory tune or do you have a tuner on it? Vacuum leak? or as mentioned start cleaning stuff, throttle body, maf sensor. Is engine ticking at idle?

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post #7 of 17 (permalink) Old 03-24-2014, 07:06 AM
 
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Champion spark plugs? In a Ford? Not bashing, just asking. I did that once and soon came to regret it. Champion is not what it used to be. That being said, I would start looking for a vacuum leak and check fuel pressure. Maybe, the idle speed air valve could be dirty or mass air flow sensor. Hopefully, the lifters didn't collapse or crack a valve. Not everything will generate a code. Bad plugs or compression loss should set cylinder imbalance. A vacuum leak may set a code indicating air in not matching air out. Start simple. Make sure there are no restrictions, stuff is reasonbly clean, check vacuum, fuel pressure and timing. Check the coils. Make sure they're on tight. Spray some WD-40 on them to see if there is a change while running. This may sound stupid but check your belt(s) and pulley's and fan, if you have a mechanical fan. Make sure all the blades are there.

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post #8 of 17 (permalink) Old 03-25-2014, 06:16 PM Thread Starter
 
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Yea honestly not happy only reason i went with champion is because i was getting bashed about the ford two piece plugs and champions wont break. Im actually looking into the autolites.

No ticking at idle i already got the cam phasor scare.

I will be getting everything this weekend once i get payed
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post #9 of 17 (permalink) Old 03-25-2014, 09:14 PM
 
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Just so you know Tommy, the Ford plugs are now one piece. Pricey but worth it.

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post #10 of 17 (permalink) Old 03-26-2014, 01:06 PM Thread Starter
 
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Well that's the thing my price on motorcraft plugs are 14 each auto lights 13 each and the stupid champions were 19 dollars each I guess biggest mistake I made so far with my baby
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