Question about 2000 Kia Sportage

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High voltage when turned on and is cold the voltage rises to 17 volts and when heated returns to normal

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What is the RPM's when you start it?

Posted on May 02, 2013

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The volt gauge could be faulty. I would have the alternator output checked first to make sure the gauge is right.

Posted on May 02, 2013

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Does low voltage in ignition have to do with a weak battery


If the voltage drops more than is normal during the ignition cycle, this can be caused by a weak/old battery (Insufficient crank amperage) or by problems with the starter motor. Most auto part shops will test your electrical system for you for free and can determine whether the battery is having problems, the alternator is failing, or the starter motor is faulty.

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2003 kia sedona ex heat not working


If the engine temp rise while sitting at lights then you have an air flow through radiator problem. Electric fans not working or viscous fan hub is faulty. high heat except at speed may indicate an air lock in the cooling system or coolant level in the radiator. Check at radiator cap not the reservoir.

Nov 30, 2013 | Cars & Trucks

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Cooling fan problems


Hi Dave the ECU receives messages from sensors, one of which is a temperature sensor. When the sensor responds to a temp higher than the normal operating temp the fans are then and only then supposed to operate. They will switch in for a brief period and then turn off again. The idle speed is in direct relation to the cold start up idle requirements and specifications. When the engine is cold the idle speed will automatically increase and as the engine achieves operating temp, the idle speed will decrease inthe way you have recorded. If you start the engine and allow it to idle until normal temp is achieved the fan should cut in. The way you've desribed all systems are A okay!. Regards John

Mar 29, 2012 | Pontiac Montana Cars & Trucks

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...


Sensor may be shorted. test o2 sensor as follows:

jturcotte_1317.gif
Heated Oxygen Sensor

See Figures 3 and 4



0900c1528003cdc8.jpg enlarge_icon.gifenlarge_tooltip.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.

Mar 25, 2011 | 1999 Chevrolet Cavalier

1 Answer

1994 dodge spirit... starts up fine and drives good ! after it is warmed up..the second you put a load to it.. like drive up an incline or take off from a stop light it spits and sputters.changed the fuel...


This looks like a cam or crank sensor problem. The crank position sensor along with the cam sensor (under the distributor cap) are responsible for fuel injection and ignition timing. With old age both of these devices are prone to the effects of heating. The sensors are of the magnetic type and have two pin electrical connector sockets. One pin is 'ground' and the other is signal (sine wave output). A voltmeter set to 2 volts AC should measure a signal in the 0.2 to 2 volts range on the 'signal' pin. It is important that the voltage measurement take place at start up when the engine is cold and again, 20 minutes later, when the engine has fully warmed up to operating temperature. Often the voltage output from faulty sensors declines with temperature rise If you see a marked decrease in voltage output with temperature rise then replace the sensor in question.

Nov 02, 2010 | Dodge Colt Cars & Trucks

1 Answer

When i remove vacuum line from map to throttle port and plug port it idles but if i open the port it stalls


The MAP is there to provide air pressure values from the inlet manifold to the engine control unit which in turn alters the pulse width of the fuel injection cycles. When the engine is at idle the throttle is closed and this creates vacuum conditions in the inlet plenum and as a result the voltage signal from the MAP should rise. Generally the MAP has 3 pins in the connecting socket, one pin is the 'reference' (usually 5 volts), the second pin is 'ground' and the third pin (usually the middle) is 'signal' voltage. At normal air pressure the MAP signal is about 1 volt. When vacuum is applied (idle throttle condition) the output signal rises by about 1 volt for every 5 inches of mercury pressure difference. At idle the voltage output will be high (4 volts) and the ECU responds by setting very short injection cycles. From what you have said is that the MAP at normal air pressure (as would be encountered when the throttle is open) is allowing the engine to idle just so long as no un-metered air gets in via the disconnected vacuum line. As soon as air enters the line the engine stalls. The stalling could be either due to too much air getting in making the air/fuel mix too lean or due to the loss of vacuum the fuel pressure regulator, creating higher fuel pressure in the fuel rail and therefore causing too much fuel to be injected per injection cycle. Check out the voltage signal from the MAP when applying a hand vacuum to it. Check the connector for dirt or corrosion. Check out the wiring from the connector back to the ECU for continuity.

Oct 29, 2010 | 1993 Chevrolet C1500

1 Answer

After a cold start, I don't get cabin heat for about 15 minutes. The heat gauge starts at C (cold), rises to normal operating temperature, then rises to just under the H (hot) for about 30 seconds, at...


Check for low coolant, you might also have a sticking thermostat. Alot of fords get air pockets, make sure if it needs coolant to let it run for about 10-15 min with the radiator cap off.

Oct 15, 2010 | 2003 Ford F150 Regular Cab

2 Answers

I just bought the two O2 sensors for my 1996 Jeep Grand Cherokee Laredo. Its a 5.2 V8. I cant afford to take it to a garage. I need help on replacing them myself. Thanks!


from the autozone.com web site. click on red X's to view pictures.


OPERATION


See Figure 1
The heated oxygen sensor, or HO2S sensor is located at the exhaust system, usually near the catalytic converter. It produces a voltage signal of 0.1-1.0 volts based on the amount of oxygen in the exhaust gas. When a low amount of oxygen is present (caused by a rich air/fuel mixture), the sensor produces a low voltage. When a high amount of oxygen is present (caused by a lean air/fuel mixture), the sensor produces a high voltage. Because an accurate voltage signal is only produced if the sensor temperature is above approximately 600°F, a fast acting heating element is built into its body.
The ECU uses the HO2S sensor voltage signal to constantly adjust the amount of fuel injected which keeps the engine at its peek efficiency.



0900c152800a9aea.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 1: Common oxygen sensor used on the 1989-90 MPI system


TESTING


  1. Start the engine and bring it to normal operating temperature, then run the engine above 1200 rpm for two minutes.
  2. Backprobe with a high impedance averaging voltmeter (set to the DC voltage scale) between the HO2S sensor signal wire and battery ground.
  3. Verify that the sensor voltage fluctuates rapidly between 0.40-0.60 volts.
  4. If the sensor voltage is stabilized at the middle of the specified range (approximately 0.45-0.55 volts) or if the voltage fluctuates very slowly between the specified range (H02S signal crosses 0.5 volts less than 5 times in ten seconds), the sensor may be faulty.
  5. If the sensor voltage stabilizes at either end of the specified range, the ECU is probably not able to compensate for a mechanical problem such as a vacuum leak. These types of mechanical problems will cause the sensor to report a constant lean or constant rich mixture. The mechanical problem will first have to be repaired and then the H02S sensor test repeated.
  6. 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 sensor to detect a lean mixture condition. Reattach the vacuum hose.
  7. Richen the mixture using a propane enrichment tool. Sensor voltage should rise to approximately 0.90 volts (while still fluctuating rapidly). This tests the ability of the sensor to detect a rich mixture condition.
  8. If the sensor voltage is above or below the specified range, the sensor and/or the sensor wiring may be faulty. Check the wiring for any breaks, repair as necessary and repeat the test.
  9. Further sensor operational testing requires the use of a special tester M.S.1700, or equivalent.


Removal & Installation


  1. Raise the vehicle and support it with jackstands.
  2. Disengage the HO2S sensor wiring connector and remove it using tool YA 8875, or its equivalent.

To install:
  1. Inspect the threads of the HO2S sensor. Apply an anti-seize compound only if there is none visible on the threads. Be careful not to contaminate the sensor tip with any foreign compounds.
  2. Install the sensor using tool YA 8875, or its equivalent and engage the wiring connector.
  3. Carefully lower the vehicle.

Oct 14, 2010 | Jeep Grand Cherokee Cars & Trucks

1 Answer

High voltage


yes. you will need to know the engine size for the exact location. it is usually on the passenger side firewall.

Aug 09, 2009 | 1992 Jeep Cherokee Briarwood

1 Answer

Chevy TrailBlazer heat won't shut off


most gm cars use electrily controled temp actuator door on top of center of heater case . if move the temp lever to hot or cold you should see the door arm move sometimes the arm will move but the door dosent there is three wires too the motor one 12 volt one ground and one return to the hvac modle head controls there are different colors for the return wire.basically you can un hook the arm and move it manunlly to see if it makes a difference at the vent while the ac system is on.the way test for the problem is to check the voltage on the return wire at the motor and ground with a dvm meter you should see a vary voltage when slide temp controls from hot to cold . more than likey it is hvac control head but check first they are costly.

May 29, 2009 | 2002 Chevrolet TrailBlazer

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