New thermostat = Better fuel economy?

Engines, Transmissions & Final Drive questions and answers

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nath
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Joined: Thu Oct 14, 2004 7:04 pm
Vehicle: ND - 2 GT
Location: Sydney

New thermostat = Better fuel economy?

Postby nath » Sun Oct 01, 2006 2:56 pm

Had a few coolant leaks so while I was replacing a couple of gaskets I also replaced the thermostat.

After doing this I am now getting @ an extra 40-50kms out of a tank of petrol. (it's now back up to a range that most other NA6s seem to be getting)

Serioulsy.

I didn't think there was any possibility of this being correct. But if the ECU was staying in warm up mode for longer than it should (ie dodgey thermostat not closing properly) and therfore running richer for longer than normal, could this be the reason for bad fuel economy?

NS
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sirbob
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Posts: 235
Joined: Fri May 26, 2006 9:23 am
Vehicle: ND - 2 GT
Location: Brisbane

Postby sirbob » Sun Oct 01, 2006 3:13 pm

You've answered your own question...

Yes, if the thermostat was stuck open then the engine will remain cooler for longer and the ECU will keep on running the richer fuel map for longer.
Now driving a Grand Vitara whilst waiting for the elusive Black SE
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