Question about 1999 Chevrolet Cavalier

2 Answers

I have a 99cavalier i just had a used motor put into it.. 2 day of driving it the check engine light came on and now when im stopped it blows cold air and when im goin its really hot can this be the thermostat?

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  • Jeff Turcotte
    Jeff Turcotte Mar 25, 2011

    afraid you have a blown head gasket. Combustion gasses leak into cooling system and form a bubble that stops the flow to the heater core until you step on the gas and pressure blows bubble out of the way.

  • tlf070206 Mar 25, 2011

    ok well let me throw another one at you... the o2 censor on the front of the engine was unpluged.. i pluged it in and then the car wouldn't start?????

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  • Chevrolet Master
  • 8,195 Answers

Sensor may be shorted. test o2 sensor as follows:

i have a 99cavalier i - jturcotte_1317.gif
Heated Oxygen Sensor

See Figures 3 and 4



enlarge_icon.gif

Fig. Fig. 3: Typical heated oxygen sensor diagram


WARNING Do not pierce the wires when testing this sensor; this can lead to wiring harness damage. Backprobe the connector to properly read the voltage of the HO2S.

  1. Perform a visual inspection on the sensor as follows:
    1. Remove the sensor from the exhaust.
    2. If the sensor tip has a black/sooty deposit, this may indicate a rich fuel mixture.
    3. If the sensor tip has a white gritty deposit, this may indicate an internal anti-freeze leak.
    4. If the sensor tip has a brown deposit, this could indicate oil consumption.

All these contaminates can destroy the sensor, if the problem is not repaired the new sensor will also be damaged.
  1. Reinstall the sensor.
  2. Start the engine and bring it to normal operating temperature, then run the engine above 1200 rpm for two minutes.
  3. Turn the ignition OFF and disengage the H02S harness connector.
  4. Connect a test light between harness terminals A and B (refer to graphic). With the ignition switch ON and the engine off, verify that the test light is lit. If the test light is not lit, either the supply voltage to the H02S heater or the ground circuit of the H02S heater is faulty. Check the H02S wiring and the fuse.
  5. Next, connect a high impedance ohmmeter between the H02S terminals B and A (refer to graphic) and verify that the resistance is 3.5-14.0 ohms.
  6. If the H02S heater resistance is not as specified, the H02S may be faulty.
  7. Start the engine and bring it to normal operating temperature, then run the engine above 1200 rpm for two minutes.
  8. Backprobe with a high impedance averaging voltmeter (set to the DC voltage scale) between the oxygen sensor (02S) and battery ground.
  9. Verify that the 02S voltage fluctuates rapidly between 0.40-0.60 volts.
  10. If the 02S voltage is stabilized at the middle of the specified range (approximately 0.45-0.55 volts) or if the 02S voltage fluctuates very slowly between the specified range (02S signal crosses 0.5 volts less than 5 times in ten seconds), the 02S may be faulty.
  11. If the 02S voltage stabilizes at either end of the specified range, the PCM is probably not able to compensate for a mechanical problem such as a vacuum leak or a faulty fuel pressure regulator. These types of mechanical problems will cause the 02S to sense a constant lean or constant rich mixture. The mechanical problem will first have to be repaired and then the 02S test repeated.
  12. Pull a vacuum hose located after the throttle plate. Voltage should drop to approximately 0.12 volts (while still fluctuating rapidly). This tests the ability of the 02S to detect a lean mixture condition. Reattach the vacuum hose.
  13. Richen the mixture using a propane enrichment tool. Voltage should rise to approximately 0.90 volts (while still fluctuating rapidly). This tests the ability of the 02S to detect a rich mixture condition.
  14. If the 02S voltage is above or below the specified range, the 02S and/or the O2S wiring may be faulty. Check the wiring for any breaks, repair as necessary and repeat the test.

Posted on Mar 25, 2011

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  • Contributor
  • 14 Answers

Feel the upper and lower rad hoses when engine is hot and not running. Also check the antifreeze level, not in the tank but at rad cap. Sometimes these engines get a coolant lock in them and when it finaly bleeds through the coolant is low. If the coolant is ok ( the level) and one hose id hot and the other cold replace the thermostat.

Posted on Mar 25, 2011

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