terrible gas milage - FordTough.ca - Home of Canadian Ford Truck Enthusiasts
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post #1 of 18 (permalink) Old 12-09-2010, 09:35 AM Thread Starter
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terrible gas milage

hey guys i have a 00 f150 4.2 v6 285000 ...im only getting 350-400km to a tank. mix highway and in city driving but it just dosnt seem right, even for a high km truck. . i always do oil changes less than every 5000km and upgraded to just a k&n filter for the stock box which i clean regualary. wondering if anyone out there is in the same situation and if theres anything i can do to help it out, im dying with these high gas prices.
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post #2 of 18 (permalink) Old 12-09-2010, 12:37 PM
 
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change your spark plugs and wires..and check your 02 censors


MAKE: Ford, MODEL:Ranger, YEAR: 1993, MODS:4inch body lift, 32 11.5 15 M/T's, push bar chrome, rollbar black,4 off road light JVC CD deck,2 12' mtx subs, 1000watt mtx amp,blue neon
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post #3 of 18 (permalink) Old 12-09-2010, 05:36 PM Thread Starter
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ive done the plugs and wires in the spring , and wouldnt the check engine light go on if my 02 censors were toast?
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post #4 of 18 (permalink) Old 12-09-2010, 06:08 PM
 
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it may it may not
if you have a code reader or can get one your best bet is to plug it in and see if you have throwin any codes and see
02 censors are one thing to keep in mind

you can slao try injector cleaner?
any thing like that might help


MAKE: Ford, MODEL:Ranger, YEAR: 1993, MODS:4inch body lift, 32 11.5 15 M/T's, push bar chrome, rollbar black,4 off road light JVC CD deck,2 12' mtx subs, 1000watt mtx amp,blue neon
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post #5 of 18 (permalink) Old 12-09-2010, 06:55 PM
 
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I didn't get a CEL with my 96 Mazda 3.0 litre RWD truck. When I bought my used truck in 2000 (just over 60,000 km), I was getting lousy gas mileage in the city and on the hwy (around 12 or so mpg). After going thru a number of mechanics, the poor gas mileage was attributed to two O2 sensors. Never ever got a CEL that was related to the O2 sensors.

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post #6 of 18 (permalink) Old 12-09-2010, 10:29 PM
 
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I had a 99 v6 auto thing got about the same milage as you. dumped a bunch of $$ into it and couldnt get any better so i bought a 2000 f150 with the 5.4 and got about 200-300 klm more per tank



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post #7 of 18 (permalink) Old 12-09-2010, 11:14 PM
 
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Ethanol in your gas?..that's supposed to be a shitkicker on mileage..did this lousy mileage just start?

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post #8 of 18 (permalink) Old 12-10-2010, 01:03 AM
 
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I suspect it's O2 related. I've got about the same mileage and I get over 600 km/tank city and over 700 km/tank hwy. You said you changed the plugs in the spring. What brand of plugs? The 4.2's are very picky about what plugs you put in them. Also did you gap them properly 0.054" is good. I know a guy on another forum who is having the same issue, I'll dig up what he has found so far, IIRC something about one of the IMRC runners not working properly.


Whaddya mean I dont pay my bills?? Whydya think I'm broke!!

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post #9 of 18 (permalink) Old 12-10-2010, 03:25 AM
 
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the plugs could be part of the issue not gaped right or certen plugs run a different temps.
i'm gonna stuck with changing the 02 censors out


MAKE: Ford, MODEL:Ranger, YEAR: 1993, MODS:4inch body lift, 32 11.5 15 M/T's, push bar chrome, rollbar black,4 off road light JVC CD deck,2 12' mtx subs, 1000watt mtx amp,blue neon
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post #10 of 18 (permalink) Old 12-13-2010, 08:30 AM
 
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i do get terrible gaz milage to but i am due for a tune up wires spark plugs and a new pcv valve gaz filter is new from this spring when i put new gaz tank in and air filter is still new
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