2005 F-150 4.6L Rough Idle/Fluctuating RPMs
02-17-2017, 02:55 PM
#12
Moderator
Either way report back with your findings.
02-17-2017, 03:44 PM
#13
Junior Member
Did you scan it? I was having (Sort of am now) the same issue. Maybe it has a stored or pending code PO171? You might try to clean the Idle Air control valve as well. I was running a bit rough too. I cleaned the MAF sensor, the throttle body & the IAC as well. It sill runs just a touch rough every once in a while. No codes though.
02-17-2017, 08:26 PM
#14
No scan, I dont have the equipment to do that, if I disconnect the battery I assume any/all codes will be cleared, so if you think scanning it before doing that is worth it, I am sure I can find someone who has that tool but at that point I may bring it to a mechanic cause even if I knew the codes I'm not sure I'd know what to do with them. 
02-17-2017, 08:35 PM
#15
Moderator
If you can get codes off of it we can usually tell you what to do with them. Check it for codes is a good idea. Most local parts stores will check them for free. Write them down and post them back here.
02-24-2017, 10:40 PM
#16
Just wanted to update this thread to help anyone else out there that maybe having this issue and hopefully to get some more advice.
I took the truck into a shop, I just couldn't figure this issue out, they did. I apparently have two bad valves in cylinder 5 and 6 which is causing the rough idle. I had the mechanic do a compression check and he found 5 and 6 misfiring and the estimated cost to fix is $1500-2000. I think at this point with owning the truck for about 2 months and already putting about $1000 into the truck I'm going to just take a loss, trade this in and get a new truck. I called around to a few different shops and the price is right around what they would all charge to do this work.
I would put the money into it if I thought this would be the end but this has caused more fear and just will be waiting for the next thing to happen. I would lose a couple thousand to do this and that's not easy to accept as I'm a very financially responsible person (which is why I bought the truck in the first place, no car payment). Am I nuts for considering this..? Welcoming all opinions..
I took the truck into a shop, I just couldn't figure this issue out, they did. I apparently have two bad valves in cylinder 5 and 6 which is causing the rough idle. I had the mechanic do a compression check and he found 5 and 6 misfiring and the estimated cost to fix is $1500-2000. I think at this point with owning the truck for about 2 months and already putting about $1000 into the truck I'm going to just take a loss, trade this in and get a new truck. I called around to a few different shops and the price is right around what they would all charge to do this work.
I would put the money into it if I thought this would be the end but this has caused more fear and just will be waiting for the next thing to happen. I would lose a couple thousand to do this and that's not easy to accept as I'm a very financially responsible person (which is why I bought the truck in the first place, no car payment). Am I nuts for considering this..? Welcoming all opinions..
