Question about 1999 Chevrolet Astro

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1999 Chevy Astro idles rough, engine cuts out. When throttle position sensor is unplugged engine runs fine. I have replaced the tps, no change.

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Check fuel pressure should be 60lbs key on engine off. If less than 60 replace fuel pump.

Posted on May 09, 2010

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My 91 Chevy s-10 2 wheel drive p/u w/2.5 four cylinder wont idle and runs rough when i rev the motor which the only way i can keep it running is to feather the throttle. If i unplug the vacuum to the


the problem if from the map sensor.. when you change it it will run rough and keep cutting off,, keep stating it back and reeving over and over as soon as it cuts off again keep repeating until the CPU gets calibrated with the new sensor and it starts idling smoothly..

Dec 30, 2012 | 1991 Chevrolet S-10

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Where is the thorttleposition sensor on 2001jeep cherokee


The 3 wire Throttle Position Sensor (TPS) is mounted on the throttle body and is connected to the throttle blade.
The TPS is a 3wire variable resistor that provides the Powertrain Control Module (PCM) with an input signal (voltage) that represents the throttle blade position of the throttle body. The sensor is connected to the throttle blade shaft. As the position of the throttle blade changes, the resistance (output voltage) of the TPS changes.
The PCM supplies approximately 5 volts to the TPS. The TPS output voltage (input signal to the PCM) represents the throttle blade position. The PCM receives an input signal voltage from the TPS. This will vary in an approximate range of from .26 volts at minimum throttle opening (idle), to 4.49 volts at wide-open throttle. Along with inputs from other sensors, the PCM uses the TPS input to determine current engine operating conditions. In response to engine operating conditions, the PCM will adjust fuel injector pulse width and ignition timing.
The PCM needs to identify the actions and position of the throttle blade at all times. This information is needed to assist in performing the following calculations:

selectachapter.gif

Cherokee, Grand Cherokee, 1999-2005
Throttle Position Sensor

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Operation

The 3 wire Throttle Position Sensor (TPS) is mounted on the throttle body and is connected to the throttle blade.
The TPS is a 3wire variable resistor that provides the Powertrain Control Module (PCM) with an input signal (voltage) that represents the throttle blade position of the throttle body. The sensor is connected to the throttle blade shaft. As the position of the throttle blade changes, the resistance (output voltage) of the TPS changes.
The PCM supplies approximately 5 volts to the TPS. The TPS output voltage (input signal to the PCM) represents the throttle blade position. The PCM receives an input signal voltage from the TPS. This will vary in an approximate range of from .26 volts at minimum throttle opening (idle), to 4.49 volts at wide-open throttle. Along with inputs from other sensors, the PCM uses the TPS input to determine current engine operating conditions. In response to engine operating conditions, the PCM will adjust fuel injector pulse width and ignition timing.
The PCM needs to identify the actions and position of the throttle blade at all times. This information is needed to assist in performing the following calculations:


Ignition timing advance Fuel injection pulse-width Idle (learned value or minimum TPS) Off-idle (0.06 volt) Wide Open Throttle (WOT) open loop (2.608 volts above learned idle voltage) Deceleration fuel lean out Fuel cutoff during cranking at WOT (2.608 volts above learned idle voltage) A/C WOT cutoff (certain automatic transmissions only)


Removal & Installation

3.7L & 4.0L

  1. Disconnect TPS electrical connector.
  2. Remove TPS mounting screws.
  3. Remove TPS.

To Install:
The TPS is mounted to the throttle body. The throttle shaft end of throttle body slides into a socket in the TPS. The TPS must be installed so that it can be rotated a few degrees. (If sensor will not rotate, install sensor with throttle shaft on other side of socket tangs). The TPS will be under slight tension when rotated.
  1. Install TPS and retaining screws.
  2. Tighten screws to 7 Nm (60 inch lbs.) torque.
  3. Connect TPS electrical connector to TPS.
  4. Manually operate throttle (by hand) to check for any TPS binding before starting engine.

4.7L
  1. Remove air duct and air resonator box at throttle body.
  2. Disconnect TPS electrical connector.
  3. Remove two TPS mounting bolts (screws).
  4. Remove TPS from throttle body.

To Install:
The throttle shaft end of throttle body slides into a socket in TPS. The TPS must be installed so that it can be rotated a few degrees. If sensor will not rotate, install sensor with throttle shaft on other side of socket tangs. The TPS will be under slight tension when rotated.
  1. Install TPS and two retaining bolts.
  2. Tighten bolts to 7 Nm (60 inch lbs.) torque.
  3. Manually operate throttle control lever by hand to check for any binding of TPS.
  4. Connect TPS electrical connector to TPS.
  5. Install air duct/air box to throttle body.

Hope this helps

Dec 31, 2011 | 2001 Jeep Grand Cherokee

1 Answer

1!999 civic lxi has rough idle, have replaced servo unit but the idle still rough


I would recommend that you have the throttle body cleaned out, and replace the TPS (throttle position sensor) sensor.

Mar 16, 2011 | 1999 Honda Civic

2 Answers

I got code p2176 I changed out the tps still got same problem did not have this problem with other engine just changed engine out now cant seem to get this code off causing the car to rough idle and low...


P2176=Throttle Actuator Control System - Idle Position Not Learned
Did you use all you old sensors,or is some of them from the new engine,I would swap out the IAC sensor or check for wires not hooked up.
If it can't relearn to idle the Idle air control might be different then your old one,but its not registering with the computer

Dec 17, 2009 | 2006 Chevrolet Impala

1 Answer

I have a 1997 Astro van that runs very ruogh at


check the throtle position sensor(TPS) that maybe the problem.

Sep 13, 2009 | 1997 Chevrolet Astro

2 Answers

When a/c is turned on idles rough and rpms drop put in neutral and idles fine in gear rough idle when you come to stop already changed egr valve not the problem


See if the idle control is working. I have a protegee that does the same thing, although the cause of mine is diffrent, it is the torque converter clutch not disengaging when stopped. Read the code, and see if there are any. Auto Zone will read it for free and give you a print out.

Jun 30, 2009 | 1999 Mazda 626

1 Answer

Throttle body just replaced; now runs & idles rough


adjust the TPS, throttle position sensor.

First though, disconnect battery for 1/2 hour. Restart engine and drive for 15 miles while computer relearns changes you made. Will run rough for this period.

Apr 25, 2009 | 2005 Nissan Quest

11 Answers

99 dodge ram 1500 5.2 liter stalling on start up.


Check and clean idle air control valve
check for vacuum leaks
suspect idle air control valve

Sep 11, 2008 | 1999 Dodge Ram

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1995 Chevy silverado with a 5.7. Was running fine i stopped at a stoplight and it died. It was hard starting, i had to turn the AC off to get it to start, then had to 2 feet it home. Now it starts and...


I have experienced this problem on similar vehicles. You should try and replace the coolant temp sensor. If it is not reading the correct temp to the ecm, it will not get the right fuel map. Also, the cts will not always throw a code.

Aug 04, 2008 | 1999 Chevrolet Silverado 1500

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