EVAP Purge Valves & STFT ?
#1
EVAP Purge Valves & STFT ?
Aloha,
Anyone know the relationship between leaking EVAP purge valves & short term fuel trim. I have consistantly lean Long & short term trims (-6 to -7) & know if I pinch the purge vapor hose, the stft will return to normal parameters if the valve is leaking.
My question is...would a leaking purge valve cause the motor to run rich or lean ?.
Mahalo
Anyone know the relationship between leaking EVAP purge valves & short term fuel trim. I have consistantly lean Long & short term trims (-6 to -7) & know if I pinch the purge vapor hose, the stft will return to normal parameters if the valve is leaking.
My question is...would a leaking purge valve cause the motor to run rich or lean ?.
Mahalo
#2
The ECU will sense the air leak (O2 sensor readings) and compensate by changing Long Term Fuel Trim (LTFT) which will be negative. If LTFT exceeds a lmiit, perhaps 35-40%), then Check Engine Light is set on. Probably obd1 code 43 for fuel supply is set.
good luck
good luck
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02-26-2013 10:03 AM