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I have a hunch on why I get such bad MPG

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Old 02-14-2010, 09:53 PM
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Default I have a hunch on why I get such bad MPG

I just filled up, and I am getting 10 MPG, and I have been driving it like an old lady.and when I did the plenum, I put a Stant 195 degree thermostat in.

I just hooked up my code reader, and it told me this:
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It says my coolant is 183 Degrees. Is it possible that the truck is still running in warm up mode, and the 02 sensors aernt working?
 
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Old 02-14-2010, 09:57 PM
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183* sounds normal.

But your front O2 sensor might be shot. Hughes Engines has the best price on NTK sensors I've found. $49 for NTK 23151
 
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Old 02-14-2010, 09:57 PM
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By 183 degrees the computer would have gone into closed loop and the O2 sensors would be working.
 
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Old 02-14-2010, 10:02 PM
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I know why I get such bad mpg's too. I got a 3 ton truck with a V8 engine.
 
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Old 02-14-2010, 10:07 PM
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Originally Posted by pavement_hater
I know why I get such bad mpg's too. I got a 3 ton truck with a V8 engine.

hahaha but 10? Really?
 
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Old 02-14-2010, 10:12 PM
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Well, if that isnt the problem, I guess I will make a trip to Napa tomorrow and get a new distributer cap and rotor.
 
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Old 02-14-2010, 10:17 PM
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Did you check your cat? My mpg sucks right now and I've done the Hughes plenum, cat is most likely plugged up so I'm gutting it tomorrow.
 
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Old 02-14-2010, 10:41 PM
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was the truck fully warm when u checked it ?
if yes i would say try a new temp sensor for the computer...
 
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Old 02-14-2010, 10:47 PM
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Originally Posted by sit22 II
was the truck fully warm when u checked it ?
if yes i would say try a new temp sensor for the computer...
Why do you say that?
 
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Old 02-14-2010, 10:52 PM
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I havent checked my cat because I dont know how, and because my truck has 75K miles on it. I doubt it bad.

I dont think my temp sensor is bad.

Yes, truck was fully warmed up, and it was 42 degrees outside.
 


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