1997 f150 with 5.4l loss of power and mileage - Ford Truck Enthusiasts Forums



1997 - 2003 F150 1997-2003 F150, 1997-1999 F250LD, 7700 & 2004 F150 Heritage

1997 f150 with 5.4l loss of power and mileage

Reply
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 06-11-2011, 10:44 PM
93turbo 93turbo is offline
New User
Thread Starter
 
Join Date: Sep 2008
Posts: 9
93turbo is starting off with a positive reputation.
1997 f150 with 5.4l loss of power and mileage

hey my 1997 f150 2wd with a 5.4l triton motor has 267,xxx miles on it. the only things that ever needed replaced were the alternator and coil packs. i put an insys usa intake on it and true dual 2.5" glasspacks. it ran great for about a month and i got between 18 and 20 mpg. and now it seems less snappy and i get 14mpg no matter what. this truck is crazy reliable and the frame and body are spotless. i need help on getting my economy and power back so i dont have to sell it. thanks
Reply With Quote
  #2  
Old 06-12-2011, 12:35 AM
danger-ranger93's Avatar
danger-ranger93 danger-ranger93 is offline
Posting Guru
 
Join Date: Jul 2009
Posts: 1,607
danger-ranger93 is starting off with a positive reputation.
Ever done the plugs on it? May want to do plugs if you haven't, and the seafoam treatment is very high up on my "recomend" list.
Reply With Quote
  #3  
Old 06-12-2011, 07:27 AM
enriched&beyound enriched&beyound is offline
Posting Guru
 
Join Date: Aug 2008
Location: NE Iowa JD Country
Posts: 1,024
enriched&beyound is starting off with a positive reputation.
Have you tried to scan for codes?? sometimes there might be codes without the CEL

Have you cleaned the MAF sensor?
Have you checked for vacuum leaks?
Have you cleaned the throttle body?
Reply With Quote
  #4  
Old 06-12-2011, 11:01 AM
KhanTyranitar's Avatar
KhanTyranitar KhanTyranitar is offline
Postmaster
 
Join Date: Oct 2009
Posts: 3,411
KhanTyranitar has a very good reputation on FTE.KhanTyranitar has a very good reputation on FTE.KhanTyranitar has a very good reputation on FTE.
I would take that intake off, clean the MAF, and see if that doesn't take care of it. Not sure what kind of filter your new intake uses, but oil based filters are known to cause problems with MAF contamination.
Reply With Quote
  #5  
Old 06-24-2011, 10:41 PM
93turbo 93turbo is offline
New User
Thread Starter
 
Join Date: Sep 2008
Posts: 9
93turbo is starting off with a positive reputation.
Plugs haven't been changed in a while only because they are a bear to change. MAF sensor is fine and the intake is spottless. My filter does not use oil. I was thinking more along the lines of plugged up cats but Idk.
Reply With Quote
  #6  
Old 06-24-2011, 10:44 PM
93turbo 93turbo is offline
New User
Thread Starter
 
Join Date: Sep 2008
Posts: 9
93turbo is starting off with a positive reputation.
I also gave it a bottle of injector cleaner which helped a little
Reply With Quote
  #7  
Old 06-25-2011, 12:09 AM
danger-ranger93's Avatar
danger-ranger93 danger-ranger93 is offline
Posting Guru
 
Join Date: Jul 2009
Posts: 1,607
danger-ranger93 is starting off with a positive reputation.
Plugs helped mine a TON. Yes, they were a pain in the *** but it needed to be done.
Reply With Quote
  #8  
Old 06-25-2011, 12:24 PM
93turbo 93turbo is offline
New User
Thread Starter
 
Join Date: Sep 2008
Posts: 9
93turbo is starting off with a positive reputation.
yeah ill see about talking the old man into letting me do it again
Reply With Quote
  #9  
Old 06-26-2011, 12:08 AM
danger-ranger93's Avatar
danger-ranger93 danger-ranger93 is offline
Posting Guru
 
Join Date: Jul 2009
Posts: 1,607
danger-ranger93 is starting off with a positive reputation.
Well, let me add some info here, mine had 259,*** miles on the originals.
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
What mpg should a 1997 Ford F-250 XLT 4X4 with a 7.5 (460) fordinmudd 1987 - 1996 F150 & Larger F-Series Trucks 11 06-05-2016 11:46 PM
Need help Tj Megan Rider Modular V8 (4.6L, 5.4L) 3 12-01-2015 09:15 AM
Avg mpg for 2004 F150 5.4l? shockr4 2004 - 2008 F150 22 02-13-2014 11:26 PM
1997 f-350 diesel / fuel economy mezcalero280cal 1994.5 - 1997 7.3L Power Stroke Diesel 19 02-13-2012 08:23 PM
mileage-tell the truth! johnsdiesel 1999 to 2016 Super Duty 57 06-09-2003 11:27 AM


Go Back   Ford Truck Enthusiasts Forums >

Tags
2002, 54, 54l, f150, ford, insys, intake, loses, losing, loss, maf, mpg, power, sluggish, triton

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump


All times are GMT -5. The time now is 01:31 AM.


This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.