Very poor gas mileage, 07 3.5 AWD

[What a VUE]

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 wasn’t. No stored codes, no active MIL. Mileage has cratered down to about 14-15 highway. I’m a little stumped.

Anybody have any ideas?

[Vue6]

...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.

[SL2 Ride]

Maybe the injectors?

[What a VUE]

Originally Posted by Vue6

...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.

I’ve considered plugs, coils but no misfire codes. Ever. No O2 codes. I get the feeling I’m going to have to start with a new tune-up, O2s all-round and if that doesn’t work…

Originally Posted by SL2 Ride

Maybe the injectors?

Maybe the injectors.

Far2Grumpy’s been trying to help me as well, and it’s got us both stumped.

[SL2 Ride]

Originally Posted by What a VUE

DC: 200k-plus on the engine.

I’ve considered plugs, coils but no misfire codes. Ever. No O2 codes. I get the feeling I’m going to have to start with a new tune-up, O2s all-round and if that doesn’t work…



Maybe the injectors.

Far2Grumpy’s been trying to help me as well, and it’s got us both stumped.

what have you checked so far?

[What a VUE]

Originally Posted by SL2 Ride

what have you checked so far?

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.

[SL2 Ride]

Originally Posted by What a VUE

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