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The Terminator
Terminator Talk
Fuel Economy Woes - 8.5mpg
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<blockquote data-quote="cj428mach" data-source="post: 15635574" data-attributes="member: 142081"><p>"Checking" your tune would be a waste of money.</p><p></p><p>You basically said that your mileage sucks even when you're not in boost, your O2 sensors are always looking for stoich unless you're in open loop which only takes place during cold start up and WOT. If you log your STFT and the ecm is making corrections you're in closed loop. That means your problem is something mechanical like an exhaust leak, bad O2 or a miss causing a false lean condition.</p><p></p><p>The only thing a bad tune could do is command full time open loop with a crazy commanded lambda or crazy commanded lambda at WOT.</p></blockquote><p></p>
[QUOTE="cj428mach, post: 15635574, member: 142081"] "Checking" your tune would be a waste of money. You basically said that your mileage sucks even when you're not in boost, your O2 sensors are always looking for stoich unless you're in open loop which only takes place during cold start up and WOT. If you log your STFT and the ecm is making corrections you're in closed loop. That means your problem is something mechanical like an exhaust leak, bad O2 or a miss causing a false lean condition. The only thing a bad tune could do is command full time open loop with a crazy commanded lambda or crazy commanded lambda at WOT. [/QUOTE]
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Fuel Economy Woes - 8.5mpg
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