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Bad mileage

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Old Nov 3, 2007 | 10:13 PM
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Bad mileage
As mentioned, bad mileage is the problem. Like really bad. Like 140km to a 60 litres or so. Is this normal? My truck is an 88 f-150 with a 351w.

CAs
 
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Old Nov 3, 2007 | 10:36 PM
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Running bad?
black smoke?
hard to start?

any of these as well?

come on all of a sudden, or is it getting worse?
 
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Old Nov 3, 2007 | 10:49 PM
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runs good, no black, smoke, starts every time, just bad mileage kinda all the time.


CAs
 
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Old Nov 3, 2007 | 10:54 PM
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Hole in the tank? Neighbor stealing it over night?
 
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Old Nov 3, 2007 | 10:58 PM
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nope and nope

any more ideas?

I am going to cut the cats out one of these days. could this be the problem?

CAs
 
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Old Nov 3, 2007 | 11:12 PM
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Originally Posted by f-150kid
As mentioned, bad mileage is the problem. Like really bad. Like 140km to a 60 litres or so. Is this normal? My truck is an 88 f-150 with a 351w.

CAs
Changing out the oxygen sensor if it has over 50k miles would be a good idea. When I did it to my 92 F150 with 100k miles--it improved the MPG by about 1-2 miles.
 
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Old Nov 3, 2007 | 11:28 PM
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sounds like a plan, come monday ill do that


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Old Nov 4, 2007 | 08:26 AM
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Clean all sensor while at it the IAC and egr can get dirty . Also spray out the throttle body . Just a cheap idea
 
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Old Nov 4, 2007 | 08:34 AM
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might wanna change the intake air temp and coolant temp sensors..
could be in-range failures (and cheaper than the O2)
 
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Old Nov 4, 2007 | 09:19 AM
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nobody mentioned it soooooo dont forget about the air filter :-p.. that and how you drive can affect your mileage by 6% so be easy on her and that should help some too...

Ken
 
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Old Nov 4, 2007 | 09:26 PM
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Originally Posted by f-150kid
As mentioned, bad mileage is the problem. Like really bad. Like 140km to a 60 litres or so. Is this normal? My truck is an 88 f-150 with a 351w.
CAs
An '88 with a 351.. you probably have a C6 tranny. If you also have low gearing that truck will be thirsty for sure.
 
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Old Nov 4, 2007 | 09:47 PM
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Originally Posted by JLDickmon
might wanna change the intake air temp and coolant temp sensors..
could be in-range failures (and cheaper than the O2)
Thats what I was thinking. Those sensors can turn anything into a gas guzzler. Those temp sensors + the O2 sensor, high fuel pressure (check the regulator) would be the first things to look at. To get any solid info you would need to monitor those sensors in real time and compare to spec and/or hook up an exhaust gas analyzer to see if it is running rich. I would first analyze the exhaust gases. For the fuel pressure regulator hook up a fuel pressure gauge then see what the pressure with/without vacuum applied and check for fuel on the vacuum side of the diaphram.

Either that or you are expecting better MPG than something like this will give and what you are experiencing is the nature of the beast. You would need reading to tell for sure.
 
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Old Nov 4, 2007 | 10:13 PM
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Stupid question, but does someone have a picture of where the Air Charge Temp sensor is? I've searched on my 5.0 but can't find it at all.
 
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Old Nov 4, 2007 | 10:25 PM
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Look on the LH side of the intake around #5 &#6 injectors. That's where my Chilton manual says it should be.
 
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