Question about GMC Envoy

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My truck want idle over 1000 rpm. I've changed the trotted body and the map, but it still idles at 600 to 800 rpms

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  • GMC Master
  • 1,848 Answers

-Yes most car prefer at 750 to 800 Rpm.

Mai Lor

Posted on Apr 19, 2013

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 182 Answers

SOURCE: idle control

tps (throttle position sensor) controls the idle and the ideal idle is around 700-850

Posted on Oct 01, 2008

  • 1 Answer

SOURCE: Erratic Idle problem in 91 accord

THE DISTRIBUTOR WILL CAUSE THIS PROBLEM IN A HONDA TRY A KNOWN GOOD ONE .

Posted on Apr 03, 2009

csmock132
  • 4669 Answers

SOURCE: 87 chevy truck with TBI idles too fast

Spray the intake with carb cleaner to find the vacuum leak. Check where the EGR mounts and the throttle body gasket sense you had both off.

Posted on May 10, 2009

  • 72 Answers

SOURCE: ford freestar, idle is wierd,

try a tune up

Posted on Jun 11, 2009

  • 142 Answers

SOURCE: idling to high and engine revs from 1000 to 2000 rpm

lower the idle switch,might have to have mechanic do it if u dont know where it is,wont cost alot,very easy

Posted on Oct 18, 2009

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Have a '99 silverado that will not idle


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Apr 15, 2013 | 1999 Chevrolet Silverado 1500

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Idles around 4000 rpms when started and wont idle normal


Change the egr valve i just did it on my 1995 and it idles at 1000 rpm it was at 3000 at 1st
And clean out throttle body
If that doesnt work u most likely have a stuck throttle which usual doesnt happen

Oct 16, 2012 | 1995 Oldsmobile Aurora

1 Answer

My 05 chevy malibu is not excelerating or shifting properly...


I would test both the tps and map sensors.
map sensor is here:

0996b43f802030b8-etlvqcyxjdbbokifzikh1c5u-5-0.gif

Testing

Check the Manifold Absolute Pressure (MAP) sensor circuit as follows:
Ignition OFF, disconnect the MAP harness connector at the MAP sensor.Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit terminal 2 and ground.If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 1 and ground.If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.Verify the scan tool MAP Sensor parameter is less than 1 kPa.If greater than the specified range, test the signal circuit terminal 3 for a short to voltage. If the circuit tests normal, replace the ECM.Install a 3A fused jumper wire between the signal circuit terminal 3 and the 5-volt reference circuit terminal 1. Verify the scan tool MAP Sensor parameter is greater than 126 kPa.If less than the specified range, test the signal circuit terminal 3 for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.If all circuits test normal, test or replace the MAP sensor.

0996b43f802030bb-etlvqcyxjdbbokifzikh1c5u-5-2.gif


Check the Throttle Position (TP) sensor circuits as follows:
Ignition OFF, disconnect the harness connector at the throttle body.Ignition OFF for 90 seconds, test for less than 5 ohms of resistance between the low reference circuit terminal C and ground.If greater than 5 ohms, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM. Ignition ON, test for 4.8-5.2 volts between 5-volt reference circuit terminal E and ground.If less than 4.8 volts, test 5-volt reference circuit for a short to ground or an open / high resistance. If the circuit tests normal, replace the ECM.If greater than 5.2 volts, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM. Verify the scan tool TP sensor 1 voltage is less than 0.1 volt.If greater than 0.1 volt, test the signal circuit terminal D for a short to voltage. If the circuit tests normal, replace the ECM. Verify the scan tool TP sensor 2 voltage is greater than 4.8 volts.If less than 4.8 volts, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM. Install a 3A fused jumper wire between the signal circuit terminal D and the 5-volt reference circuit terminal E of the TP sensor 1. Verify the TP sensor 1 voltage is greater than 4.8 volts.If less than 4.8 volts, test the TP sensor 1 signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM. Install a 3A fused jumper wire between the signal circuit terminal F and the low reference circuit terminal C of the TP sensor 2. Verify that the TP sensor 2 voltage is less than 0.1 voltIf greater than 1.0 volt, test the TP sensor 2 signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM. Ignition OFF for 90 seconds, disconnect the harness connector at the ECM.Test for less than 5 ohms of resistance on all TP sensor circuits between the following terminals:ECM C2 signal circuit terminal 65 to TP terminal DECM C2 signal circuit terminal 63 to TP terminal FECM C2 5-volt reference circuit terminal 3 to terminal E If greater than 5 ohms, repair the affected circuit for open/high resistance.Test for infinite resistance between TP sensor 1 signal circuit terminal D and TP sensor signal circuit terminal F.If less than infinite resistance, repair the short between TP sensor 1 signal circuit and TP sensor 2 signal circuit. If all circuits test normal, replace the throttle body.

0996b43f802030be-etlvqcyxjdbbokifzikh1c5u-5-5.gif
Fig. Throttle Actuator Control electrical connector


Throttle Body Relearn Procedure
NOTE
Do NOT perform this procedure if DTCs are set.

Start and idle the engine in PARK for 3 minutes.With a scan tool, monitor desired and actual RPM.The ECM will start to learn the new idle cells and Desired RPM should start to decrease.Ignition OFF for 60 seconds.Start and idle the engine in PARK for 3 minutes.After the 3 minute run time the engine should be idling normal.
NOTE
During the drive cycle the check engine light may come on with idle speed DTCs. If idle speed codes are set, clear codes so the ECM can continue to learn.

If the engine idle speed has not been learned the vehicle will need to be driven at speeds above 70 km/h (44 mph) with several decelerations and extended idles.
After the drive cycle, the engine should be idling normally.

If the engine idle speed has not been learned, turn OFF the ignition for 60 seconds and repeat step 6.Once the engine speed has returned to normal, clear DTCs.

Jul 29, 2017 | 2005 Chevrolet Malibu

1 Answer

My Ford Focus is a 2000, and a lot of times it shudders violently when I'm idle or under 1000 RPM. Only once have I had it actually kill the engine. For now I've been keeping my foot on the gas...


replace the iack (idel air control valve) this controls you air to fuel mixture when can is just idleing
when you use the gass peddle to keep rpms us this over rides the iack just replace it and it should be ok

Aug 10, 2011 | 2005 Ford Taurus

1 Answer

1991 Chevy Caprice has a mild miss fire and stall at low rpm: This is my latest update: I checked and cleaned the EGR,PCV,IAC valve, M.A.P sensor and Throttle body(bore/butterfly). with carb cleaner....


Do you have the idle speed turned up to keep it from dying? Because it is high. Check engine light on? Have you checked for vacuum leaks at the gasket under the throttle body? How does the car run under acceleration? You might have a worn distributor shaft.

Jun 22, 2010 | 1991 Chevrolet Caprice

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