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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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Old 02-17-2022, 05:45 PM   #2
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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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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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Old 04-13-2022, 10:16 AM   #5
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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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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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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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Old 04-27-2022, 10:42 PM   #8
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Default Re: Very poor gas mileage, 07 3.5 AWD

Quote:
Originally Posted by SL2 Ride View Post
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
Until he didn't.

I thought of that as well, but realized after scooting under there - they weren't there.
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Old 05-04-2022, 03:25 PM   #9
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2006 VUE Red Line
Default Re: Very poor gas mileage, 07 3.5 AWD

Swollen front brake caliper hose?? Just throwing out there as a possibility since there are no codes being set. Does it feel an little sluggish? Check and see how hot the rotors are, unless you are doing frequent, hard stops the calipers should be warm to the touch not super hot.
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Old 05-04-2022, 07:44 PM   #10
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Default Re: Very poor gas mileage, 07 3.5 AWD

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Originally Posted by newbievueowner View Post
Swollen front brake caliper hose?? Just throwing out there as a possibility since there are no codes being set. Does it feel an little sluggish? Check and see how hot the rotors are, unless you are doing frequent, hard stops the calipers should be warm to the touch not super hot.
Brakes are new and fine. Problem pre-dated the brake job as well.

Not sluggish at all, no stumbles, no nothing. Thatís what makes this so hard to dx.
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Old 05-05-2022, 08:27 AM   #11
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Default Re: Very poor gas mileage, 07 3.5 AWD

Quote:
Originally Posted by What a VUE View Post
Brakes are new and fine. Problem pre-dated the brake job as well.

Not sluggish at all, no stumbles, no nothing. Thatís what makes this so hard to dx.
Not sure if maybe you misunderstood what I said or whether I missed something in what you might have mentioned. So you have had the front brake caliper hoses changed? On these Vues, the front brake line getting pinched off due to rust on the bracket that holds the hose is VERY common, especially if you live in an area that gets salt put on the roads on the winter. I've had to do them on both the Vue's I owned in the past. Was just a thought/area to look at as you are not getting any DTC's and really crappy fuel economy.
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Old 05-05-2022, 09:38 AM   #12
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Default Re: Very poor gas mileage, 07 3.5 AWD

Quote:
Originally Posted by newbievueowner View Post
Not sure if maybe you misunderstood what I said or whether I missed something in what you might have mentioned. So you have had the front brake caliper hoses changed? On these Vues, the front brake line getting pinched off due to rust on the bracket that holds the hose is VERY common, especially if you live in an area that gets salt put on the roads on the winter. I've had to do them on both the Vue's I owned in the past. Was just a thought/area to look at as you are not getting any DTC's and really crappy fuel economy.
Understood perfectly. As I said, brakes are new, includes hoses.
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Old 05-05-2022, 02:30 PM   #13
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Default Re: Very poor gas mileage, 07 3.5 AWD

Ok, I have no other idea then at this point.
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Old 05-05-2022, 09:00 PM   #14
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Default Re: Very poor gas mileage, 07 3.5 AWD

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Ok, I have no other idea then at this point.
Welcome to the club. 😑
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Old 06-30-2022, 08:56 PM   #15
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Default Re: Very poor gas mileage, 07 3.5 AWD

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Welcome to the club. 😑
I'm wondering if you ever solved your low fuel mileage.
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Old 07-08-2022, 05:51 PM   #16
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Default Re: Very poor gas mileage, 07 3.5 AWD

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I'm wondering if you ever solved your low fuel mileage.
I have not. Haven't been driving it as a result.
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Old 07-12-2022, 11:56 AM   #17
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Default Re: Very poor gas mileage, 07 3.5 AWD

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I have not. Haven't been driving it as a result.
Did you ever swap out the injectors? I have to wonder if worn injectors couldnt be dumping more gas in the cylinders.
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Old 07-13-2022, 08:24 PM   #18
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Default Re: Very poor gas mileage, 07 3.5 AWD

Quote:
Originally Posted by SL2 Ride View Post
Did you ever swap out the injectors? I have to wonder if worn injectors couldnt be dumping more gas in the cylinders.
I haven't yet. Going to start with obvious, basic fixes. Plugs, coils, filters, O2 both upstream and downstream.

Started thinking about this again the other day, wondered if a bad EGR could be
causing issues? Also, Honda is now recommending 0-20 synthoil, and that's what the tech has been using for some time. I'm also wondering if the thinner oil is contributing to the problem.
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Old 07-13-2022, 10:02 PM   #19
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Default Re: Very poor gas mileage, 07 3.5 AWD

Quote:
Originally Posted by What a VUE View Post
I haven't yet. Going to start with obvious, basic fixes. Plugs, coils, filters, O2 both upstream and downstream.

Started thinking about this again the other day, wondered if a bad EGR could be
causing issues? Also, Honda is now recommending 0-20 synthoil, and that's what the tech has been using for some time. I'm also wondering if the thinner oil is contributing to the problem.
Wouldn't a bad egr or 02 sensor throw a code?
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Old 08-01-2022, 11:16 AM   #20
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Default Re: Very poor gas mileage, 07 3.5 AWD

Quote:
Originally Posted by SL2 Ride View Post
Wouldn't a bad egr or 02 sensor throw a code?
You'd think so. But no codes, no nothing.
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