brtb
NAXJA Forum User
- Location
- Orlando, FL
Ever since I got this thing it's been getting mileage that I considered pretty amazing from a 1988 with a big engine and 117k miles: 300-350 miles on 17 gallons of the cheap stuff. Just on this last tank it's dropped significantly... it's reading 1/2 tank, I might have gone 75-100 miles so far, and nothing's changed in the driving pattern. Ideas on anything that'd suddenly change the mileage?
I was thinking the O2 sensor might be suspect, the timer thingy's still going so I assume they were both replaced sometime before but maybe not. Dunno if it'd just go suddenly either, instead of slowly degrading with time. Any other sensors to check? No codes of course, got the usual Renix setup. Do have a DMM and an analog one if it'd help anything
It did have good regular maintenance done on it otherwise, got the records from the previous owner... last trans-fluid replacement was at 75k or so (pretty sure it's Dexron, bright red), same for the diff, regular 3-4k mile oil changes with 10w30 non-synth.
I was thinking the O2 sensor might be suspect, the timer thingy's still going so I assume they were both replaced sometime before but maybe not. Dunno if it'd just go suddenly either, instead of slowly degrading with time. Any other sensors to check? No codes of course, got the usual Renix setup. Do have a DMM and an analog one if it'd help anything
It did have good regular maintenance done on it otherwise, got the records from the previous owner... last trans-fluid replacement was at 75k or so (pretty sure it's Dexron, bright red), same for the diff, regular 3-4k mile oil changes with 10w30 non-synth.
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