Re: Grand Cherokee 2000 getting Extremely bad millage @ 14.5MPG from17.5MPG within 1 month.
that jeep has some very close tolerences when it comes to 02 sensors and
operating parameters and it has 4 o2 sensors those sensor cost 100 each at least and it' not a cheap throw at it part!gone are the days of100 k sensors do you wrench at a dealer pete? Peter wrote: > ANY vehicle that has over 100,000 miles on it and the mileage drops > suddenly, it is most likely the O2 sensors that need replacing. They > are probably still working but not 100% correctly. They don't always > should up as codes when a diagnostic is run either. You most likely > have 2 of them, one before and one after the catalytic converter on > your exhaust. Replace them both. > > "philthy" <dbrider@cac.net> wrote in message > news:46F56C4B.FAC3788A@cac.net...if you are using the > overhead console for this mileage figures please note that > only does a average and NOT a real life mileage figure > if you fill your tank start the jeep the overhead > recalculates that, by taking a reading off the fuel level > sensor then it will take a few other imputs including you > pulling out of the gas station and flooring it it looks at > the tps speed senor and then recalculates the milage again > then dispalys the figure giving you the average milage not > the real milage > and does it again after you shut it off and restart it > use the old style of figuing milage and not the overhead and > if you have bad milage then start looking elsewere > wilsonb wrote: > > > The weirdest thing has happened recently. > > Grand Cherokee 2000 getting Extremely bad millage @ > > 14.5MPG from > > 17.5MPG within 1 month. > > Computer jumps back and fourth with MPG 19.5 then jump > > down to 13.5 > > then back up to 14.5.. > > and it's noticeably guzzling gas like crazy. > > (Has 1000,000miles) > > 4.7lt, 2wd, V8 > > > > So far have; > > Replaced all Sparks with E3 > > Cleaned Air filter > > Put good gas cleaner in tank a few times now. > > Use regular gas > > Have take to Chrysler Dealer and they have no clue. > > (Will call back tomorrow and ask why they didn't do a full > > Scan on it > > when I had a 'full' check done on it.) > > I checked the exhaust and there is a black grid out of it, > > maybe gas > > running to rich? Sensors off? Fuel filter? > > > > Any else have this or ideas? > > > > Thanks so much.. > |
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