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jdmathis84 3/17/2012

1999 Chevrolet Astro LT 6 Cyl 4.30L


What is causing the knocking sound, black exhaust smoke, rough idle, and horrible gas mileage?

It has 179k miles, I recently changed the oil and plugs, there was no soot or il on the plugs. Last year it began to run hot due to a damaged radiator, but was running fine until late December/early January. It occurs all the time, especially at idle when the knocking is very loud. The check engine light has been on for a while., but I didn't know auto parts stores would read them. Also, I have a new distributor cap and will be getting plug wires and a rotor soon.

1 Answer


CVO 3/17/2012

1.Local auto parts stores such as Autozone ( not in California) or Advance Auto parts will scan and retrieve any diagnostic trouble codes stored in the powertrain control module for free of charge..

2. Amazon.com has the code reader for less than $21.00 dollars.

3.Re-post the dtc's in here " answer question " and we will advise the repair.

Note: we need the dtc's to identify the sensor, there're a dozen different sensors to operate the car and we can't do with a guesswork.

Visit this site and see all the sensors.


Navigate to this site and see the code reader



jdmathis84 3/20/2012

I went to AutoZone today. They said I had ten DTC's. Reading the printout, there are some that are the same code, P0147(2), P0146(3), P1153(2), and 1 each for P0151, P0125, P0300 and P01870. Most deal with oxygen sensors. How many sensors are required for this model vehicle?


CVO 3/20/2012

Oxygen Sensor
1999 Chevrolet Truck Astro Van 2WD 4.3L SFI 6cyl
The Oxygen Sensor is located:
Under vehicle, passenger side, below seating area, mounted in exhaust pipe in rear of catalytic converter
Number four


CVO 3/20/2012

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