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Discussion Starter · #1 ·
Runs sluggish. Reset PCM by removing #11 and clamped both battery terminals together and car never ran better for 1 day. Then back to this crap with 18 gallons of gas and only 125 miles on full tank. Help please! Jim:)
 

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Super Moderator
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If you have more than 100k miles, replace all 4 oxygen sensors. They have a tendency to be slow reading and still not throw a code. That will absolutely kill fuel mileage and other than the MPG, it will still appear to run like it should.
 

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GrampaGreg, BBQ master planner
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2,900 Posts
Just left NUR performance, I had the very same problem, car runs great but can't pass a gas station.
they checked and found the tune was screwed up and the fuel at regular driving was up to 20% rich.
Although at idol and wot it corrected and was ok. Scheduling a visit for some time on the dino and HP tuners.
 

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GrampaGreg, BBQ master planner
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2,900 Posts
PS sorry the O sensors were fine and car has 90,000 miles.
 
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