Low gas milage
#1
Low gas milage
Hi, I'm new to this forum. Looks pretty tight and lots of good answers to peoples questions.
I bought a 1991 f150 extended cab with 6 cylinder inline 4.9 motorwith 140 K miles . The fellow i bought it from swears he was getting around 14 in town and 19 on the highway. I'm getting a good soild 9 per gallon around town. I've done the following:
>replaced battery wires.
>changed air and crankcase filter.
>installed new muffler(old one was mostly not there. The whole back of it was missing"
>replaced fuel pump in mid tank
Aside from the above i tightened 5 out of 6 of the sparkplugs. Some where really loose.
I notice it idles high.
Also it seems to run way cool.
My next step is going to be to replace the thermostat and the sending unit.
I havn't run any codes on it yet.
Thanks for any help
Rich
I bought a 1991 f150 extended cab with 6 cylinder inline 4.9 motorwith 140 K miles . The fellow i bought it from swears he was getting around 14 in town and 19 on the highway. I'm getting a good soild 9 per gallon around town. I've done the following:
>replaced battery wires.
>changed air and crankcase filter.
>installed new muffler(old one was mostly not there. The whole back of it was missing"
>replaced fuel pump in mid tank
Aside from the above i tightened 5 out of 6 of the sparkplugs. Some where really loose.
I notice it idles high.
Also it seems to run way cool.
My next step is going to be to replace the thermostat and the sending unit.
I havn't run any codes on it yet.
Thanks for any help
Rich
#2
Pull codes.
Don't rely on the stock gauge for correct measurements of temp, oil pressure and voltage.
See above.
#7
up date of poor gas milage
It has been a while ......Part of my bad gas mileage is because i have dual tanks . The front tank recirculates into the rear. In calculating the mpg i didn't know gas was being sent to the rear......Duh.... I still sense it's a gas hog.
why would the front tank dump into the rear....anyway!
why would the front tank dump into the rear....anyway!
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#8