mpg
mpg
Elder User
Joined: Oct 2005
Posts: 514
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i assume it is a 4.9 90 f150...what trans do you have. what rear end? size tires....did you switch tire size recently. did anything happen differently than usual when ths mpg dropped. was it literally one day fine, next day bad? just give us a little background to give us an idea what we are working with. is your air cleaner clean? shouldn't effect it THAT much unless you filled it with cement.
chris
chris
Post Fiend
Joined: May 2004
Posts: 11,289
Likes: 6
From: Lakewood, Ohio
everything that 4.9inline6 said and:
when last tuneup? if plugs are fouled than that could be it, just change them, it is cheap to buy a set of motorcraft plugs for your truck. how many miles on truck? was it cold, raining? where you off road?
when last tuneup? if plugs are fouled than that could be it, just change them, it is cheap to buy a set of motorcraft plugs for your truck. how many miles on truck? was it cold, raining? where you off road?
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Joined: Mar 2006
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From: elmwood
i don't know a whole lot about it i am a welder not a mechanic. i got 33's on it with a 4 speed with no overdrive which doesn't help i know. i don't know what rear end, it hasn't been running any different i just put in a new air cleaner. i don't think the plugs are all fouled but i know they are getting bad. if i tromp on iot real fast it chugs just a second then takes off
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Post Fiend
Joined: May 2004
Posts: 11,289
Likes: 6
From: Lakewood, Ohio
Originally Posted by 90_f150_4.9
i don't know a whole lot about it i am a welder not a mechanic.
Cross-Country
Joined: Feb 2006
Posts: 91
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From: John Day, Or
You said in your last post,you just installed a new air cleaner. Did you mean a new air filter? If so, look for a vacumn hose that is loose or has fallen off the air cleaner. Maybe the air cleaner isn't on tight. I replaced the gasket on the top of the carb where the air cleaner sits and the condensation in my oil went away. Hope this helpes 