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Old Jul 15, 2011 | 05:42 PM
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power issue
My 1999 f250 has a 5.4l when I am going up a steep hill or towing my truck seems to loose power between 2200-2600 rpm in third gear it's an automatic I did an trans service replaced two coil packs and the EGR sensor the truck has 153000 miles I just bought it in may and did the intake gasket put new plugs in. put it on the dealer computer and can't find anything wrong anybody have any ideas?
 
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Old Jul 15, 2011 | 11:05 PM
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Have you had the catalytic converter checked? My buddy had a similar issue with his 5.4 and it ended up being a partially clogged cat.
 
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Old Jul 16, 2011 | 08:44 AM
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What make of plugs did you use?
 
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Old Jul 18, 2011 | 07:21 PM
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Motorcraft plugs I will check the cat but it doesn't' do it unless I'm going up a big hill and really get on the gas or I'm towing a trailer
 
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Old Jul 18, 2011 | 08:21 PM
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When it down shifts does it scream? Or does it downshift? These engines don't have much power unless they shift down and get the r's up. Esp a 99. If you go up a hill in 2nd gear if you floor it will it go to 5k rpm quickly? If not you may have clogged fuel filter or bad pump..



Dick
 
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Old Jul 19, 2011 | 01:32 AM
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It shifts ok just when your on the gas it feels like it has a lot of power then no power then lots of power and the cycle keeps repeating until it hits 2800 rpm
 
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Old Jul 19, 2011 | 08:04 AM
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Does the power stay low after 2800?
 
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Old Jul 19, 2011 | 04:19 PM
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No the power picks up like it should
 
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Old Jul 19, 2011 | 05:37 PM
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On the 99's there is a power valve in the intake..System that operates at a certain rpm..
 
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Old Jul 19, 2011 | 08:46 PM
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I just did an intake gaskit never noticed the problem before I did it where in the intake is this power valve ?
 
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Old Jul 19, 2011 | 08:52 PM
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Don't really know. Only in the 99's and maybe there is a cut off date..They stopped putting it in there in 2000. I guess it wasn't such a good idea..Supposed to help with low rpm power and at a certain rpm open up the whole intake to the engine. Maybe its not hooked up?


Dick
 
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Old Jul 19, 2011 | 08:55 PM
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I'll have to check into it thanks for the info
 
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Old Jul 19, 2011 | 08:58 PM
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I have all the info on cd I'll have to look at it again..Most folks don't know about it..
 
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Old Jul 20, 2011 | 08:34 PM
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Let me know my brother inlaw is a Ford mechanic and he doesn't remember
 
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