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Old 07-04-2014, 08:05 PM   #1
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Default vct and idle

Just picked up an edge evolution today. Trucks had a bit of rough idle prior. With the monitoring ability my rpm at idle jumps between 650-675 ish. Also monitoring variable cam timing which goes from 0-1 when the idle is rough. Any ideas? Cam phasers vcts (revised part #'s) timing chain/guides all done motorcraft through ford about 10 months ago.
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Old 07-05-2014, 09:52 AM   #2
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I recently cleaned the throttle body on my 2005 5.4L and it really helped to smooth out a minor rough idle. It was fairly clean and I was surprised how much better it was. Just an idea since it is something that is easy to do and just cost $5, so if it did not help you would not be out much.
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Old 07-05-2014, 11:43 AM   #3
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Originally Posted by dnlow View Post
I recently cleaned the throttle body on my 2005 5.4L and it really helped to smooth out a minor rough idle. It was fairly clean and I was surprised how much better it was. Just an idea since it is something that is easy to do and just cost $5, so if it did not help you would not be out much.
Ok ill try that first thanks man
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Old 07-05-2014, 03:35 PM   #4
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Clean your maf sensor too with maf cleaner. Helps a lot also
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Old 07-05-2014, 04:38 PM   #5
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If all else fails change your oil to 5w-30. This will help if the rough idle is oil pressure/VCT related... The VCT solenoids may also need to be cleaned due to debris on the screens..
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Old 07-05-2014, 06:31 PM   #6
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If all else fails change your oil to 5w-30. This will help if the rough idle is oil pressure/VCT related... The VCT solenoids may also need to be cleaned due to debris on the screens..
Cleaned after that short of a time? Mines an 08 with brand new vcts last September
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Old 07-05-2014, 11:51 PM   #7
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Cleaned after that short of a time? Mines an 08 with brand new vcts last September
Well I suggest you try the TB and MAF cleanings first. But yes, if all else fails change the oil to 5w-30...If that does not do it then pull the solenoids for and inspection and cleaning.. The slight variation in VCT at idle is what leads me to believe there may be a Hangup at the solenoids..
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Old 07-27-2014, 06:23 PM   #8
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Originally Posted by Especial86 View Post

Well I suggest you try the TB and MAF cleanings first. But yes, if all else fails change the oil to 5w-30...If that does not do it then pull the solenoids for and inspection and cleaning.. The slight variation in VCT at idle is what leads me to believe there may be a Hangup at the solenoids..
I've done the maf sensor and removed my entire throttle body. Seems to be a lot smoother at idle and on the gas. Also bought some weather stripping and re sealed my air box. Thanks
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