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Old 03-28-2013, 03:10 PM   #11 (permalink)
tru
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Join Date: Aug 2011
Location: FL
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tru - '05 Ford Focus ZX3
90 day: 39.46 mpg (US)

the truck - '02 GMC Sierra Denali
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Quote:
Originally Posted by Miller88 View Post
I think it's more an effect of warmer everything ... not warmer fuel.

My Focus never seems to fully warm up on cooler days. Thermostat was tested good, but it still just doesn't like to heat up.

Do you have any grille blocking?
What temp does you focus run? and model year?

in florida winter i can barely break 170 with a strong grill block

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Old 03-28-2013, 11:48 PM   #12 (permalink)
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no nickname , it's just a car - '04 volkswagen golf tdi
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this is very correct

Quote:
Originally Posted by Old Mechanic View Post
Why unplug the knock sensor? I think that would hurt your mileage. Will probably set the check engine light.

I think a 195 t-stat would be fine but you might check to see what was offered as original equipment.

regards
Mech
"Mech" is very correct
DO NOT
disconnect the knock sensor (s) if you do the system will never advance ignition timing so as to prevent engine damage from unknown and potentially damaging conditions . there will be no feedback and the system will be in "open loop" as far as ignition timing is concerned
everything will be UN improved

and harmful emissions will increase

as it is
you may find that you have a P0420 after you replace the thermostat
as , you may have suspended certain testing by operating at a lower than specified temperature for a "long" time
a newer system would have set a "coolant MAP" or "time to temp" Fault already .

whatever tests that were suspended by low operating temp will be enabled when the system conditions are present that allow the tests to run

running too "cold" for extended periods makes the cat work harder

be prepared for a "surprise"

change the engine oil too ,either now
or
yesterday.
use dexos1 or ACEA A3 B3 A3 B4 in the correct viscosity for your application
do not use alleged "dino oil" .

there really is no dino oil or fossil fuel but that is another topic

Last edited by mwebb; 03-28-2013 at 11:59 PM.. Reason: surprise
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Old 03-29-2013, 10:03 AM   #13 (permalink)
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Quote:
Originally Posted by Old Mechanic View Post
Why unplug the knock sensor? I think that would hurt your mileage. Will probably set the check engine light.

I think a 195 t-stat would be fine but you might check to see what was offered as original equipment.

regards
Mech
I read on here somewhere that Ford even recomended unplugging the KS. It was too sensitive and will retard your timing even when there is no ping present. I'll try it. I can always plug it back in. I just filled up and calculated an actual 35.7 mpg for 225 miles mixed city/hwy. I want to get to 40.
1999 Ford ZX2

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