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Old January 8th, 2007, 06:50 PM   #1
blacy001
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Default bad gas mileage

ive got a gmc denali pickup with the vortex 6000 it was getin 14.7m/g but now it gets 12m/g with a clean air fliter anybody got any ideas
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Old January 8th, 2007, 07:43 PM   #2
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bad o2 sensor. Is it pulling a check engine light?
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Old January 8th, 2007, 09:31 PM   #3
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bad o2 sensor. Is it pulling a check engine light?
no the light not on
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Old January 9th, 2007, 07:28 AM   #4
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what year? I would change the up stream o2 sensors. Especially if the gas mileage went to shit really quick.
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Old January 9th, 2007, 02:31 PM   #5
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what year? I would change the up stream o2 sensors. Especially if the gas mileage went to shit really quick.
its a 2002
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Old January 24th, 2007, 09:46 PM   #6
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the problem is now its cold outside and the fact that its a 6.0L
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Old January 24th, 2007, 09:57 PM   #7
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cold out, thicker oil, longer warm up times, runs in open loop mode longer, over all uses more gas when cold, simple as that
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Old January 25th, 2007, 07:25 AM   #8
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Leaking fuel pressure regulator. Done 3 of them this week alone..
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Old January 25th, 2007, 07:04 PM   #9
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the problem is now its cold outside and the fact that its a 6.0L
The Winner! Trail-XJ is most likley correct. 6.0 AWD, feel proud with 12 this time of year.
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Old January 25th, 2007, 07:14 PM   #10
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it is a GM thing
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