Cheyennek1500
Newbie
Hi Everyone, I have been chasing down a idle hunting problem recently. My issue is that in park/neutral the engine idle will hunt for the a stable engine speed. This happens after the engine warms up. When I shift into drive the engine speed stabilizes. The AFR in drive is rich around 11. The AFR in park/neutral goes lean and then it catches itself and goes to stiochiometric as I can see on a wideband o2 sensor I installed. I recorded both events with TunerPro RT which is attached in the Zip file. I would appreciate some guidance of how to solve this issue. Thanks!
Vehicle Details:1992 K2500 454 TBI 4L80E (All Stock)
Fuel Pressure: 26 PSI
Base Timing: 4 BTDC
New and checked parts:
-O2 Sensor
-IAC Valve
-TPS
-CTS
-MAP Sensor
-Distributor
-Exhaust Manifolds and Y-pipe
-Fuel Pressure Regulator
-Fuel Pump and lines
-Fuel Injectors
-EGR Solenoid
Vehicle Details:1992 K2500 454 TBI 4L80E (All Stock)
Fuel Pressure: 26 PSI
Base Timing: 4 BTDC
New and checked parts:
-O2 Sensor
-IAC Valve
-TPS
-CTS
-MAP Sensor
-Distributor
-Exhaust Manifolds and Y-pipe
-Fuel Pressure Regulator
-Fuel Pump and lines
-Fuel Injectors
-EGR Solenoid
Attachments
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