bad gas mileage out of no where..
05-20-2012, 08:47 PM
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bad gas mileage out of no where.. I am new here so any advice is mich appreciated. I have a 02 zo6 cammed with bolt ons. Car has gotten 30 mpg at 70 for a whole year went on a trip this weelend and 20!!!!! It ate me up in gas from what it normally does. I have no front o2's they are deleted. Ive cleaned the MAF it was dirty but did not fix problem. I have a obd 2 amd iys showing that at one point it was throwing code p0107 bank 1 . I also cheched the pvc valve and it is good. The car idles fine and might have a lilttle loss of power.. what to do? I only have 62k on the car...
05-20-2012, 09:43 PM
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Do these care have efi filter other then in the sending unit? Im just guessing here. I also read about a check valve thats locates under the back of the intake manifold? And if i was to check the fuel pressure with the scanner what should it be?
05-20-2012, 09:46 PM
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Plugs were changed 5k ago and wirs also.. car does run rich but always has since i bought it.. the plugs that were in it when i bout it where fould but still got good gas mileage... there is no misfire codes could plugs be fouled and not throw a code?
05-20-2012, 09:48 PM
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hard to say...could be some clogged or bad fuel injectors or a fueling problem with that side. do you mean that you have your rear o2's deleted? you need the front ones.
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05-20-2012, 09:55 PM
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Yea i guess your rite.. they were deleted bf i bought. If a o2 goes bad i know it will throw a o2 sensor code ive already replaces one could a bad o2 cause the po1071 code?
05-20-2012, 09:59 PM
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Heres where i get throwed off... the check engine light comes on sometimes then goes away.. so when i scan the car is has no thrown codes when i go to code history i see the po171
05-20-2012, 10:02 PM
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And also a misfire which is old i fixed that problem burnt wire.. and a o2 sensor code.. im not sure of this is a old code i fixed or the one the poppes up and goea away. Maybe i can clear code history and the scan again after light and maybe it will narrow it down.
