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SVTPerformance's Chain of Restaurants
Tuning À la carte
Heavy Misfire after WOT pull plus general hesitation while cruising
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<blockquote data-quote="BADD281" data-source="post: 12383807" data-attributes="member: 67941"><p>STFT is the opposite of LTFT. STFT above 1.00 is a rich condition whereas above 1.00 for LTFT represents a lean condition. The upstream bank 2 is giving a constant rich signal which is causing the ECU to lean out the cylinders, thus why my wideband on that side reads nearly 19.0 while the car is misfiring. I'll do a compression test but I highly doubt its anything mechanical at this point.</p><p></p><p>I'm going to datalog tomorrow and if it misfires again I'll keep an eye on o2 voltage. If bank 2 gets stuck on both STFT and voltage I'll know something is up with the wiring.</p></blockquote><p></p>
[QUOTE="BADD281, post: 12383807, member: 67941"] STFT is the opposite of LTFT. STFT above 1.00 is a rich condition whereas above 1.00 for LTFT represents a lean condition. The upstream bank 2 is giving a constant rich signal which is causing the ECU to lean out the cylinders, thus why my wideband on that side reads nearly 19.0 while the car is misfiring. I'll do a compression test but I highly doubt its anything mechanical at this point. I'm going to datalog tomorrow and if it misfires again I'll keep an eye on o2 voltage. If bank 2 gets stuck on both STFT and voltage I'll know something is up with the wiring. [/QUOTE]
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SVTPerformance's Chain of Restaurants
Tuning À la carte
Heavy Misfire after WOT pull plus general hesitation while cruising
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