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2004 - 2008 F150 2004, 2005, 2006, 2007 and 2008 Ford F150's with 5.4 V8, 4.6 V8 or 4.2 V6 engine
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  #16  
Old 05-05-2014, 09:50 PM
twfish twfish is offline
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Quote:
Originally Posted by 85e150six4mtod View Post
Someone correct me on the CEL/code thing. Just because there is no CEL does not mean there are not codes stored--is that correct?

TPS, MAF, anything in that area that's talking to the engine computer is a suspect. Even a temperature sensor that's telling it the engine is cold will cause a rich mixture and lead to poor fuel economy.
Correct to a point on the codes.
Mileage yes theres always alot of factors, however the other problems would indicate something more along actual functioning parts. Do not beleive a tps or temp woukd cause it
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  #17  
Old 05-06-2014, 08:15 PM
P.Bronner P.Bronner is offline
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Throw a fuel filter at it. I know this sounds almost absurd but I've seen these basic symptoms in fuel injected vehicles caused by fuel starvation. It certainly could be a tps sensor but I've never seen a faulty tps NOT produce a CEL. As far as sensors go, my first suspect would be MAP. I have seen those produce values out of range with no CEL. I'd still throw a fuel filter at it first.
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  #18  
Old 05-07-2014, 04:48 AM
ProgDrummer79 ProgDrummer79 is offline
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Cleaned the MAF sensor. Doesn't seem like it did much, if anything.

I will try fuel filter next. Could the MAF sensor just be bad and need changed? normally I would think if it were actually bad, it would show a CEL?
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  #19  
Old 05-08-2014, 11:07 PM
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mattsautobody442 mattsautobody442 is offline
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My 04 truck does the same thing, there's an issue with the forward clutch packs in the transmission. i change my tranny fluid so often its a minor issue but it still happens occasionally on a slow down and punch it move. trans shop said if i baby it i probably won't have a serious issue. its done it since i bought it at 66k and its got 192k on it now and i plow and tow with the best of them and its never changed. my buddy has an 08 like mine and his did it and it was plugs and coils. i would do plugs, msd coils and a trans service and take it from there...
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  #20  
Old 05-08-2014, 11:42 PM
85e150six4mtod 85e150six4mtod is offline
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Quote:
Originally Posted by ProgDrummer79 View Post
Cleaned the MAF sensor. Doesn't seem like it did much, if anything.

I will try fuel filter next. Could the MAF sensor just be bad and need changed? normally I would think if it were actually bad, it would show a CEL?
You don't need a CEL for there to be a code. Anyone try to read codes on this?
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  #21  
Old 05-09-2014, 07:59 PM
mericanwit mericanwit is offline
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02 Sensor, vacuum leak, fuel injector acting up, too many issues with these 04 5.4l motors... I had a running lean code, spray cleaned MAF sensor and changed 02 sensor although alot better still has the shudders going uphill, oh well...
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Old 05-09-2014, 07:59 PM
 
 
 
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