2004 - 2008 F150 2004, 2005, 2006, 2007 and 2008 Ford F150's with 5.4 V8, 4.6 V8 engine
Sponsored by:
Sponsored by:

Tranny? Rear end?

Thread Tools
 
Search this Thread
 
  #16  
Old 05-05-2014, 08:50 PM
twfish's Avatar
twfish
twfish is offline
Senior User
Join Date: Jun 2011
Posts: 336
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by 85e150six4mtod
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
 
  #17  
Old 05-06-2014, 07:15 PM
P.Bronner's Avatar
P.Bronner
P.Bronner is offline
Elder User
Join Date: Aug 2011
Location: Chico,CA.
Posts: 858
Likes: 0
Received 1 Like on 1 Post
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.
 
  #18  
Old 05-07-2014, 03:48 AM
ProgDrummer79's Avatar
ProgDrummer79
ProgDrummer79 is offline
Freshman User
Thread Starter
Join Date: Dec 2009
Posts: 37
Likes: 0
Received 0 Likes on 0 Posts
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?
 
  #19  
Old 05-08-2014, 10:07 PM
mattsautobody442's Avatar
mattsautobody442
mattsautobody442 is offline
Tuned
Join Date: Jan 2008
Location: Ohio
Posts: 295
Likes: 0
Received 0 Likes on 0 Posts
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...
 
  #20  
Old 05-08-2014, 10:42 PM
85e150's Avatar
85e150
85e150 is online now
Super Moderator
Join Date: Apr 2004
Posts: 31,878
Received 1,597 Likes on 1,302 Posts
Originally Posted by ProgDrummer79
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?
 
  #21  
Old 05-09-2014, 06:59 PM
mericanwit's Avatar
mericanwit
mericanwit is offline
Junior User
Join Date: May 2004
Location: philly
Posts: 73
Likes: 0
Received 0 Likes on 0 Posts
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...
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Mr.Jackson
2009 - 2014 F150
78
01-09-2017 11:23 PM
osb
Modular V8 (4.6L, 5.4L)
2
09-09-2012 03:28 PM
Old93f150
1987 - 1996 F150 & Larger F-Series Trucks
2
09-17-2010 08:43 PM
bigbluebronco43
Ford vs The Competition
28
10-12-2005 08:59 PM
sinister73
Ford vs The Competition
52
03-11-2004 11:27 PM



Quick Reply: Tranny? Rear end?



All times are GMT -5. The time now is 04:45 PM.