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Old 02-13-2022, 01:19 PM   #1
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2007 VUE 3.5L
Default Very poor gas mileage, 07 3.5 AWD

Hello all, been awhile.

2007 VUE, 3.5 AWD 220k on the clock. Not so long since plugs changed, well under recommended interval.

Runs well, seemingly. Recently changed oil and replaced the coolant temp sensor as it had failed and spiked the gage to trigger the overheat indicator. Hoped that was the cause of decreasing mileage but apparently it wasnít. No stored codes, no active MIL. Mileage has cratered down to about 14-15 highway. Iím a little stumped.

Anybody have any ideas?
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Dave
07 VUE 3.5 AWD
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Old 02-17-2022, 05:45 PM   #2
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2006 VUE Red Line
Default Re: Very poor gas mileage, 07 3.5 AWD

...Have the o2 sensors checked, depending on miles on vehicle, also which plugs you used, if not the factory plugs, i would get them, check coils ,if they are making solid contact with plugs, just some thoughts, DC.
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Old 04-03-2022, 07:15 PM   #3
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2007 VUE 3.5L
2005 ION-3 Sedan
Default Re: Very poor gas mileage, 07 3.5 AWD

Maybe the injectors?
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Old 04-03-2022, 10:03 PM   #4
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2007 VUE 3.5L
Default Re: Very poor gas mileage, 07 3.5 AWD

Quote:
Originally Posted by Vue6 View Post
...Have the o2 sensors checked, depending on miles on vehicle, also which plugs you used, if not the factory plugs, i would get them, check coils ,if they are making solid contact with plugs, just some thoughts, DC.
DC: 200k-plus on the engine.

Iíve considered plugs, coils but no misfire codes. Ever. No O2 codes. I get the feeling Iím going to have to start with a new tune-up, O2s all-round and if that doesnít workÖ

Quote:
Originally Posted by SL2 Ride
Maybe the injectors?
Maybe the injectors.

Far2Grumpyís been trying to help me as well, and itís got us both stumped.
...
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07 VUE 3.5 AWD
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Old 04-13-2022, 10:16 AM   #5
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2007 VUE 3.5L
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Default Re: Very poor gas mileage, 07 3.5 AWD

Quote:
Originally Posted by What a VUE View Post
DC: 200k-plus on the engine.

Iíve considered plugs, coils but no misfire codes. Ever. No O2 codes. I get the feeling Iím going to have to start with a new tune-up, O2s all-round and if that doesnít workÖ



Maybe the injectors.

Far2Grumpyís been trying to help me as well, and itís got us both stumped.
what have you checked so far?
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Old 04-13-2022, 12:48 PM   #6
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2007 VUE 3.5L
Default Re: Very poor gas mileage, 07 3.5 AWD

Quote:
Originally Posted by SL2 Ride View Post
what have you checked so far?
Everything I mentioned. Itís driving me nuts.

No codes. Of any kind. No misfires. No vacuum leaks, no plugged exhaust. Runs smooth and idles smooth. Iím completely stumped.
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Old 04-13-2022, 01:11 PM   #7
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2007 VUE 3.5L
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Default Re: Very poor gas mileage, 07 3.5 AWD

Quote:
Originally Posted by What a VUE View Post
Everything I mentioned. It’s driving me nuts.

No codes. Of any kind. No misfires. No vacuum leaks, no plugged exhaust. Runs smooth and idles smooth. I’m completely stumped.
Well injectors aren't the worst thing to replace...

Well what's the cost of the O2 sensors vs swapping out the injectors?

Oh, and fdryer says to check the external fuel filter.

http://www.saturnfans.com/forums/sho...d.php?t=235861
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