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Old 11-14-2014, 05:39 AM   #1
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Default Sudden engine fail safe on acceleration

Motor cut out several times in 4 months . Very dangerous ,could cause a wreck at the wrong time.
I figured it was throttle position sensor, auto zone downloaded codes and confirmed it . Bought their lifetime guaranteed one for 69 bucks , runs better than new. Had not realized it had become sluggish until I replaced it .
Simple job- just make sure you tape star drive tip in so it doesn't fall into engine recesses .
2005 f150 lariat 5.4 liter 3v at 138,000 mile.
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Old 11-19-2014, 01:11 PM   #2
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Default Thought the tps fixed it not so !

It acted up again twice , pulled throttle body and cleaned it , not that bad at 138,000. It seems this is the old troublesome throttle body the 3L series , ordered new style off ebay oem 200 bucks including shipping. Dealer here wants 364. This comes complete with tps and all.
Will see if this fixes it in a few days . I will play with the old one by applying test volts to motor . I assume its around 5 vdc from the ecm . Just have to check the polarity first. Don't want to mess with it until I get the new one.
I will post the new body number when I get it ./ Should be
8L3Z-9E926-C.
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Old 11-21-2014, 11:30 AM   #3
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Did this fix your problem?
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Old 11-21-2014, 06:44 PM   #4
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Default didn't fix it

I thought it fixed it-- but no , drives better but then it quit again . I found I have a model number throttle body that has been troubled. Starts with a 3L number . I ordered a new model number ebay oem 200 bucks. meanwhile I took it off and cleaned it real good . It wasn't too bad as I keep good air filters in it . Waiting on mail part. Dealer wanted 364.
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Old 11-26-2014, 07:48 PM   #5
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Any updates?
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Old Yesterday, 10:37 AM   #6
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Default changed throttle body

To soon to tell- it may take a month or so . The new version came from ebay
went on easy . Didn't put a new gasket on, the old one looked good . Very easy to remove and replace if you want to clean it . I cleaned the old one and ran it for a week till the new one got here. The crap in here is tough stuff ,cleaner,old tooth brush and rags are necessary. Must come from pcv valve , why not have a large filter on pcv valve that you could throw away ??? This stuff is like tar.
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