86 MINIVAN 4.3 220 TBI

1986 Chevrolet Astro

Tiny

hepme

March, 16, 2011 AT 2:48 AM

86 astro minivan runs rich and idles rough when stopped at a light but runs fine while driving?
i replaced most sensors, mapp, idle positioning, ECM, IAC. Could it be the fuel metering?

FOUND 4236 RELATED QUESTIONS

Running Rough

27 ANSWERS
34 IMAGES

Idles Rough/changed Ects

37 ANSWERS
3 IMAGES

1 Answer

Tiny

rasmataz

March, 18, 2011 AT 1:11 AM

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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