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Old 01-30-2012, 01:42 AM   #21
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I had the same stalling issues, eventually it resulted in the check engine light coming on. The local Ford garage tried to get me for $707 for a new throttle body and install. Upon removing my throttle body there was significant sludge underneath the butterfly valve.

The only issue I ran into is that I twisted/snapped the head off on of the T20 screws that held the TPS in place, but a quick trip to True Value solved that issue. Otherwise it runs like a top again, even the idling at stop signs/lights is better.

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The other thing the local Ford garage told me was that they've seen this issue on several mid 2000s F-150s and a common thread seems to be the use of a K&N Air Filter. Any reason to believe that or just an attempt to add the price of a motorcraft air filter and an extra 1/2 hour of labor?!?!
it's another highly debatable sunject between mechanics. Essentially don't over oil your filter and you will be fine. and be sure to clean your MAF again about 100 miles after you re oil your air filter, just to be safe
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Old 01-31-2012, 09:37 AM   #22
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I know it might be early, but has anyone taken off the TB on the new 5.0 to see how dirty it gets?
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Old 01-31-2012, 08:54 PM   #23
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I know it might be early, but has anyone taken off the TB on the new 5.0 to see how dirty it gets?
I'm not aware of anyone who has done so. Same concept though. Most tbs don't need it until at least 60k miles
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Old 02-03-2012, 12:38 AM   #24
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A couple years ago, mine wouldn't start and threw a couple codes:
P2104 - "Forced Idle"
P2112 - "Throttle stuck close"

I took the throttle apart and cleaned it up. It has been fine since.

My '07 4.6L has a plastic spacer with seals behind the TB. Ford recommends replacing it after it has been removed but I'm not sure that is necessary.

Good write up
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Old 04-08-2012, 12:39 PM   #25
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Just got a '06 XLT. Has a rough idle. would cleaning the throttle body eliminate that? Also, what could also potentially be the other issues? Thanks!
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Old 04-09-2012, 02:38 AM   #26
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Just got a '06 XLT. Has a rough idle. would cleaning the throttle body eliminate that? Also, what could also potentially be the other issues? Thanks!
rough idle could be partly due to a dirty tb
clean the MAF for sure.
if it still doesn't clear up then how rough are we talking?
shaking the truck rough or too low of an idle rough?
if it's the first I would look at getting spark plugs changed.
Heck if it hasn't been done yet I would change them on that truck ASAP.
Due yourself a favor and do the first two steps and go from there.
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Old 04-12-2012, 02:15 PM   #27
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Quote:
Originally Posted by ProZach

rough idle could be partly due to a dirty tb
clean the MAF for sure.
if it still doesn't clear up then how rough are we talking?
shaking the truck rough or too low of an idle rough?
if it's the first I would look at getting spark plugs changed.
Heck if it hasn't been done yet I would change them on that truck ASAP.
Due yourself a favor and do the first two steps and go from there.
Cool. The vibration is light. It would vibrate the seat belt to shake but not hard enough to rattle spare change in the cup holder. Hope that's good example. I just know that it is not suppose to do that. I didn't think about changing the spark plugs. If the TB doesn't fix that I'll look at the spark plugs. Thanks!
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Old 04-12-2012, 02:30 PM   #28
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great write up!!!!! did you ever figure out your idle issue...im having the same problem
I have a 96 with a 300. My idle was around 620. The only thing in the ignition system left for me to replace was the ignition control module, so I went for it. Idles right about 700 now.
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Old 04-13-2012, 12:56 AM   #29
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I have a 96 with a 300. My idle was around 620. The only thing in the ignition system left for me to replace was the ignition control module, so I went for it. Idles right about 700 now.
the problem with the 04-08s especially the 04+05s with the 5.4 (the tb was all one piece including the IAC and TPS about $200+) was that they came really close to idling to a stop if you cranked the wheel to hard (from my experience and many others) because the power steering pump took too much power.
750 was about the range that kept it safe but it was a little overboard to have to buy a programmer to fix this. Personally I think this is why Ford went with the electric steering on the 2011s
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Old 05-24-2012, 01:15 PM   #30
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Is there a gasket between the throttle body and intake manifold?
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Old 05-24-2012, 01:15 PM
 
 
 
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