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10-18-2008, 03:22 PM
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any suggestions?
well, my truck seems to have settled on about 5.3 miles to a gallon, it doesnt matter if I go 55 or 65 or 75, it gets about the same. Any suggestons on what I might do? I know I need to get it put on a computer but other than that, what should I do?
it's a C-15 cat says 435 on the tag, but I dont know if it's been turned up. has 13 speed and 3.55 rears.
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10-18-2008, 03:36 PM
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You might want to put some injector cleaner in your tanks. If that doesn't help then I would take it to a shop and have them do a diagnostic on it. The cost should not be that great. It could be a number of things. It might be a bad injector. A friend of mine had one and it took a long time to find it. Most times you can tell if you have a bad injector, but if they are not firing properly they can be difficult to diagnose. I would take it to a CAT dealer and just have them put it on a computer if the injector cleaner doesn't work. I use transmission fluid in my fuel to clean my injectors. It is an inexpensive way to clean them. They make several different types of commercial injector cleaner. I know you don't want to spend the money, but you are burning a lot of fuel. If you could only increase your fuel mileage by as little as 1/2 mpg it will pay for the diagnostics in a very short time.
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10-18-2008, 03:58 PM
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Quote:
Originally Posted by GMAN
You might want to put some injector cleaner in your tanks. If that doesn't help then I would take it to a shop and have them do a diagnostic on it. The cost should not be that great. It could be a number of things. It might be a bad injector. A friend of mine had one and it took a long time to find it. Most times you can tell if you have a bad injector, but if they are not firing properly they can be difficult to diagnose. I would take it to a CAT dealer and just have them put it on a computer if the injector cleaner doesn't work. I use transmission fluid in my fuel to clean my injectors. It is an inexpensive way to clean them. They make several different types of commercial injector cleaner. I know you don't want to spend the money, but you are burning a lot of fuel. If you could only increase your fuel mileage by as little as 1/2 mpg it will pay for the diagnostics in a very short time.
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I dont mind spending the money to get it right, I just dont want to waste a lot of money, I am going to change the filters today, I did put a big bottle of lucas in each tank and it didnt help. One time, I got 6.9 but that was only once and I didnt do a thing different, so that's what leads me to believe it may be in the computer, I am making good money, but spending it all on fuel, I guess to the cat dealer we go. like you said, even a little increase will make a big difference.
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10-18-2008, 04:57 PM
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Yancy Cat in Atlanta Fre...Exit 51 on the Loop. Decent shop.
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10-19-2008, 01:15 AM
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Dirty air filters could cause your engine to consume more fuel.
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10-19-2008, 01:23 AM
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Quote:
Originally Posted by GMAN
Dirty air filters could cause your engine to consume more fuel.
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one of the first things I checked, it was serviced when I bought it. oil change, filter, fuel filters and new air filters. I looked at them today and they are clean, I also checked the intake pipe and it is clean.
maybe spark plugs, points rotor and condensor would help. and new jets in the carb too.
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10-19-2008, 01:28 AM
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How many miles on it? Maybe it needs the "Rack" run??
It's a W9....so not going to get stellar mileage...but you should be able to get 6, maybe 6.3 mpg.
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10-19-2008, 01:40 AM
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Quote:
Originally Posted by Orangetxguy
How many miles on it? Maybe it needs the "Rack" run??
It's a W9....so not going to get stellar mileage...but you should be able to get 6, maybe 6.3 mpg.
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530,000 the rack is on my list of things to ask cat about.
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10-19-2008, 02:08 AM
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I have a detroit engine that gets about 5.2mpg regardless of everything I do to it. I did overhead on injectors,change filters,put it on computer and still nothing. It has 1 million 100k miles on it. I try to go slow from 110mph to 60mph,get passed by mean old people and still fuel mileage same. WHY? Is it time for new truck,yes?
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10-19-2008, 12:43 PM
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Quote:
Originally Posted by Triple Digit Bob
I have a detroit engine that gets about 5.2mpg regardless of everything I do to it. I did overhead on injectors,change filters,put it on computer and still nothing. It has 1 million 100k miles on it. I try to go slow from 110mph to 60mph,get passed by mean old people and still fuel mileage same. WHY? Is it time for new truck,yes?
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I thought you were going to tell me to try farting in the fuel tanks.
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