1986 Chevrolet Astro Repair Question
86 minivan 4.3 220 tbi
i replaced most sensors, mapp, idle positioning, ECM, IAC. Could it be the fuel metering?
Probable causes of an engine running rich are as follows:
1.Excessive fuel pressure can be cause by restricted fuel return line
2.Defective Oxygen Sensors.
3.Leaking injectors and fuel pressure regulator.
4.Coolant temperature sensor out of calibration.
5.Restricted air intake system.
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