2G Bad AFR reading

[Michael Wucher]

Hello all, looking for some advice. Recently my talon has been struggling to take off from a stop (car drops to around 500rpm idle and tries to die out, and AFR spikes 19-20) but once it gets going its fine. Today I did a little pull and noticed AFR was pegged at 22, while full throttle, also it definitely was not pulling as hard as usual. At idle, the AFR is around 15.5 spikes to 17. I'm thinking it's a possible boost leak, I plan on testing this weekend. Any input would help, thanks!

 

[NOSLO2PT0]

Boost leak would result in the opposite, running rich. What’s your fuel setup, Tuning method, Boost levels?

 

[DSMPT]

Please don't do a WOT pull until you fix the issue. You may possibly finish the engine.
Yes first things first, do a boost leak test. Also please check you alternator and battery voltage for voltage drop. It would cause a similar issue.

 

[Michael Wucher]

Boost leak would result in the opposite, running rich. What’s your fuel setup, Tuning method, Boost levels?

950cc FIC injectors, fuel labs fuel pressure regulator, walboro 255 (installing walboro 450 tomorrow). its tuned boost by gear, usually its around 22-23 lbs. Tuned on ecmlink v3

 

[Michael Wucher]

Please don't do a WOT pull until you fix the issue. You may possibly finish the engine.
Yes first things first, do a boost leak test. Also please check you alternator and battery voltage for voltage drop. It would cause a similar issue.

I did kind of wonder if the alternator is slowly going, i notice at night time the dash lights will dim slowly then go back to normal brightness

 

[DSMPT]

I did kind of wonder if the alternator is slowly going, i notice at night time the dash lights will dim slowly then go back to normal brightness

Does the car run normal when the engine is cold and those symptoms appear more often when the engine is hot? If so, you should definitely check the voltage when those symptoms appear. Maybe a bad/weak alternator (including voltage regulator) or/and battery is the cause.

 

[Michael Wucher]

Does the car run normal when the engine is cold and those symptoms appear more often when the engine is hot? If so, you should definitely check the voltage when those symptoms appear. Maybe a bad/weak alternator (including voltage regulator

the symptoms appear both hot and cold. I'll definitely look into the alternator!