Help with my 300 six
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New User
Joined: Jan 2009
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Help with my 300 six
Can someone help me figure out why my F150 with a 300 six is so weak in power. When I climb a big hill I have to put it to the flooor and it might get up to 35. It is a 1990 4x4 Auto. I am not sure but it seems like gas mileage has dropped alot also. Thanks
Elder User
Joined: Apr 2005
Posts: 726
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my 89 300 5speed pulls pretty good over 2k rpm. I did notice an issue not too long ago that my back 3 plugs were a little fouled compared to the front 3. Not sure if its manifold design or what.
Have you checked over the standard stuff? air filter, fuel filter, plugs/cap/rotor/timing etc.
Have you checked over the standard stuff? air filter, fuel filter, plugs/cap/rotor/timing etc.
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New User
Joined: Jan 2009
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Help
ok, everything was done in October. new plugs ac, air filter, fuel filter,cap & wires. Check engine light is not on. Also after everything was done it still didn't seem very good I have just been living with it.
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Senior User
Joined: Jul 2006
Posts: 396
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From: Eureka, KS
Sounds like all the 300's I've ever owned, auto or manual, especially auto.
Where do you live, in the mountains, sea level?
Where do you live, in the mountains, sea level?
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Post Fiend
Joined: May 2004
Posts: 11,289
Likes: 6
From: Lakewood, Ohio
OK. one LAST time......
what brand are the parts?
did you check codes?
are plug wires on correctly?
who did the work?
mileage?
condition?
..... ball is in your court.
Post Fiend
Joined: May 2004
Posts: 11,289
Likes: 6
From: Lakewood, Ohio
my 300 six auto pulls all the way to 70+ on highway, flat or hills.
get a motorcraft oil filter.
even though the light is not on does not mean no codes, get a code reader and read them.
cheap wires, cap and rotor mean bad performance.
get a motorcraft oil filter.
even though the light is not on does not mean no codes, get a code reader and read them.
cheap wires, cap and rotor mean bad performance.