Question about 2003 Buick Rendezvous
The engine idles at 2500 rpm cold or hot, i measured voltage at tps it
is 11.5 volts instead of 5 volts. anybody have this problem. This is a
Is the tps adjustable on set screws? is something holding the throttle plate open a bit? throttle bore gummed up? a normal tps sweep is about .6 with throttle closed and about 5 volts wide open throttle(key on/engine off) 2nd check for vacuum leaks. what about mass airflow readings?
Posted on Nov 09, 2008
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Posted on Jan 02, 2017
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3) Fuel Pressure regulator - How to check? When the engine is at idle, disconnecting the vacuum line to a healthy FPR should result in a temporary surge in engine revs for a few seconds as the immediate loss of vacuum to the FPR causes an immediate build up in fuel pressure. At each injection cycle a little more is injected causing the engine to build up revs. In the next few seconds the gradual ingress of unmetered air into the plenum, also caused by the disconnected vacuum tube, begins to upset the stable idle of the engine. The engine will suffer from rough idle until the vacuum line is reconnected. Most of the injection inputs will be crudely governed by signals received from the MAP sensor and feedback from the oxygen sensor.
4) Engine coolant sensor fault - How to check? Most often the coolant sensor is quite separate to the temperature sender, so a correct read-out on the dash board does not necessarily indicate correct sensor function. Using a voltmeter the resistance across the electrical terminals on the sensor can be measured. By removing the device from the car and putting the end of the sensor in a pan of hot water it should be possible to see an immediate change in resistance, it does not matter so much that the resistance goes up or down but that there is a discernable change with change in temperature. Generally high resistance equates to cold temperatures and vice versa. If there is no resistance change commensurate with temperature change then the sensor is at fault. If there is simply no resistance measurable (open circuit) then the sensor is at fault. If the sensor is working correctly check the connector, the wiring and the wiring insulation for faults and possible shorting
5) Low coolant - When engine is cold put interior heater setting to MAX and fan to OFF. Fill the coolant reservoir and leave the cap off whilst you switch the engine on. Squeeze top radiator hose to encourage air movement. After about a minute replace the coolant filler cap firmly. 6) Throttle position sensor fault - How to check? The socket for electrical connection with the TPS has 3 pins, one for 'ground', one for 5 volts 'reference' and a third (generally the middle one) for 'signal' output. Back probe the signal pin in the connector to the TPS. Attach the positive lead of a voltmeter to the probe and measure the voltage output as the throttle plate is rotated. If working correctly the meter should show a voltage consistent with the throttle position from approximately 1 volt when closed and 5 volts when fully open. What is looked for is smooth voltage increase with throttle change. If there are drop outs in the transition or that there is no transition seen, the TPS is faulty.
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