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Old March 2nd, 2008, 08:20 PM   #1
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Default 12-14 MPG in a 5sp 2wd explorer

anyone have any ideas, no check engine light on. gets 19-20 in the summer but when it gets cold 45ish it gets crappy. Im
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Old March 2nd, 2008, 08:21 PM   #2
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Higher RPMs from running in the cold maybe? had the same problem with my bronco II and thats all i could come up with.
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Old March 3rd, 2008, 12:51 AM   #3
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rpms stayed the same.
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Old March 3rd, 2008, 05:58 AM   #4
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Bad ECT??? Bad T-Stat??? Bad IAT??

I know this is a shitty question, as the temp gauges on these things never ever worked right from the factory, but does it get hot?? I found on my ranger that even though the gauge claimed it was getting warm, an accurate thermometer (in this case on my DVOM) dipped in the coolant revealed it wasn't....just a suggestion
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Old March 3rd, 2008, 06:05 AM   #5
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I would love to get that kind of gas milage...I am getting 10mpg down hill with the wind blowing from behind.

Yes check temp...if vehical never reaches proper operating temp the computer will always be running in open loop.

Another thing also, your vehical will never get as good of milage in the winter because of winer blend gas...but it should not be that bad, you forsure have a problem.

Cold idle sensor comes to mind as well.
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Old March 3rd, 2008, 06:11 AM   #6
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my temp is all over the place it will go to the top of the n and some times to the r of normal and drop back down to the bottom of the cold normal line. I put a peice of cardboard infront of the radiator to help warm it up in the winter and this seems to help regulate it a bit.
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Old March 3rd, 2008, 06:26 AM   #7
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Your thermostat is stuck open...vehical never reaches temp! Change thermostat, vehical warms up much quicker, runs in closed loop gets much better gas milage. Cost of fix...about $10

Just had the same exact problem with my wifes minivan...3.0 liter getting about 13mpg...gets 20 now.
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Old March 3rd, 2008, 06:31 AM   #8
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Your thermostat is stuck open...vehical never reaches temp! Change thermostat, vehical warms up much quicker, runs in closed loop gets much better gas milage. Cost of fix...about $10

Just had the same exact problem with my wifes minivan...3.0 liter getting about 13mpg...gets 20 now.
OR your viscous clutch on the fan is bad, causing it to spin at all engine temps/speeds.

If it were me, I'd do an actual diagnosis of the problem before throwing parts at it.....check the temp of the antifreeze when the vehicle is 'warm' with a thermometer to actually verify it's temp - otherwise you're throwing $$ at assumptions
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Old March 3rd, 2008, 06:42 AM   #9
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I will check the temp in the radiator later today after I take it for a few mile drive and see where abouts it is.
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Old March 3rd, 2008, 07:03 AM   #10
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OR your viscous clutch on the fan is bad, causing it to spin at all engine temps/speeds.
Only true if it does not have an electric fan.

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If it were me, I'd do an actual diagnosis of the problem before throwing parts at it.....check the temp of the antifreeze when the vehicle is 'warm' with a thermometer to actually verify it's temp - otherwise you're throwing $$ at assumptions
Sound advice...sensors can be bad and not throw a code but they will be on the borderline of being out of spec.

Need to scan it and watch the data stream...not just scan for codes.

My money is still on the thermostat being stuck open though.
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Old March 3rd, 2008, 07:09 AM   #11
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It doesn't have an electric fan......

And yes I agree that you need to scan it and watch data stream. I would also agree that the T-stat was stuck open, but the temp gauges on these vehicles (infact, all RBV's from 90-94) can be very inaccurate....IIRC there was a TSB for an updated sending unit that came out somewhere around 95-96ish for these, obviously though many never got the new sending unit.....

I'll hope it's a stuck open T-stat....easy fix if it is
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Old March 3rd, 2008, 06:49 PM   #12
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I never got a chance to look at it today. although in a 4 mile run I did get to normal so Im guessing if the stat is stuck its only partially stuck since it did war up in that short time.
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