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Help with my 300 six

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Old 01-31-2009, 03:47 PM
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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
 
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Old 01-31-2009, 03:53 PM
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welcome to fte.

rule number 1: if you don't give enough info then we can't help much.

fill in the blanks.

at least you posted the year.
 
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Old 01-31-2009, 04:00 PM
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Help
ok sorry but what blanks?
 
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Old 01-31-2009, 04:14 PM
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mileage, condition, what did you try, when last tuneup, etc.

wires. plugs. cap. what brand? how old?

air filter replaced when?
 
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Old 01-31-2009, 06:09 PM
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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.
 
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Old 01-31-2009, 06:38 PM
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Is your check engine light on?
 
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Old 01-31-2009, 06:47 PM
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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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Old 01-31-2009, 07:07 PM
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Sounds like all the 300's I've ever owned, auto or manual, especially auto.

Where do you live, in the mountains, sea level?
 
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Old 01-31-2009, 07:10 PM
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did you do a cylinder compression test?
 
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Old 01-31-2009, 08:25 PM
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Originally Posted by whatsupwiththat
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.

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.
 
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Old 01-31-2009, 08:58 PM
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No don't live in the mountians just hilly NY.
 
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Old 01-31-2009, 09:01 PM
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ok plugs AC
Filters- Fram
wires, cap& rotor can't remember
no codes
I did the work & changed one wire at a time
everything is in good shape
mileage 93k
 
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Old 01-31-2009, 09:57 PM
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SOUNDS ABOUT RIGHT FOR A 300!!! hAD TWO OF THEM BOTH DID THE SAME THING
 
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Old 01-31-2009, 10:07 PM
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ok, that could be. My buddy has one with a stick shift and it out pulls mine on hills and towing.
 
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Old 01-31-2009, 10:14 PM
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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.
 
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