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  #1  
Old 05-21-2007, 12:09 AM
1994shadowman 1994shadowman is offline
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Default Crappy Gas Mileage and other questions

Well lately ive been getting only about 23 mpg (thats completely babying it aka no revs over 3000) and its pretty much all in town. Any reason why my gas mileage sucks so much? And my mods are No Cat, Dynomax muffler, K&N Filter, and a ported airbox.

And another thing, my temp sensor is acting retarded. When I first start my car and drive for about2 miles,it spikes all the way up to H and stays there for a while then it drops down then goes up halfway and then back down and then it acts normal. Ive already replaced the thermostat. And I think the sensor might be a reason why im getting crappy mileage. Cause the fan goes nuts when it reads that high even when the temp isnt that high. Could this be? Should I replace the sensor?

Any answers are much appreciated.

-1994shadowman
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  #2  
Old 05-21-2007, 03:51 AM
1988Aries=FirstCar 1988Aries=FirstCar is offline
 
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Default RE: Crappy Gas Mileage and other questions

Hmm, the car isn't that old. Have you taken it to a shop and asked one of them to check it out? But ohh, but some coolant in it and try that, on my dads truckit was doing that on an '06 and he put some "NEW" coolant that was like 15 dollars, The people said "The Good Stuff". But after that it ran great.
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Old 05-23-2007, 01:23 AM
1994shadowman 1994shadowman is offline
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Default RE: Crappy Gas Mileage and other questions

That would work, but my radiator was replaced in November.
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Old 05-23-2007, 02:26 AM
89Daytona 89Daytona is offline
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Default RE: Crappy Gas Mileage and other questions

Have you tried checking the ECU codes?

The coolant temp sensor is only ~$20, so its not that expensive.
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Old 05-23-2007, 10:35 PM
1994shadowman 1994shadowman is offline
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Default RE: Crappy Gas Mileage and other questions

No i havent, but the engine isnt throwing up the "idiot light"(check engine). How would i check them?
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Old 05-23-2007, 11:30 PM
speedyshelby speedyshelby is offline
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Default RE: Crappy Gas Mileage and other questions

http://minimopar.knizefamily.net/fault/index.html
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Old 05-26-2007, 06:25 PM
1994shadowman 1994shadowman is offline
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Default RE: Crappy Gas Mileage and other questions

Well like I said the engine light isnt on, Ithinkits probably because I was running 93 and didnt have to. I am getting better mileage with 87.
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  #8  
Old 06-04-2007, 08:18 PM
Dodge_Ram_3500 Dodge_Ram_3500 is offline
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Default RE: Crappy Gas Mileage and other questions

I had the same problem with my old Shadow, I got about 290 kilometers to a $35 tank, while my friends were getting 500 km's plus. Not sure the problem there, but I honestly think it got the same mileage as my truck does. Could be a sensor for sure.
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Old 06-20-2007, 01:15 AM
1994shadowman 1994shadowman is offline
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Default RE: Crappy Gas Mileage and other questions

FYI as an update I am pulling 27 mpg with it now since running it on a steady diet of 89.
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Old 01-09-2008, 12:21 AM
dfraser dfraser is offline
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Default RE: Crappy Gas Mileage and other questions

When I replaced the fuel pressure regulator in the TBI my gas mileage improved by 25%. As for the temperature "peaking" on the gauge that is caused by air in the cooling system. This drove me nuts for a year and I replaced the rd and water pump. When you replace the thermostat drill a 1/8" hole in the flange so the system can be fully purged.

Dan

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