Question about 2003 GMC Envoy

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When I put my 2003 GMC in drive it hesitiate. But when I put it in neutral it calms down

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  • GMC Master
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When a vehicle is in neutral there is no load the moment you put it in gear then there is a load,If you hesitate in gear and try to accelerate and it hesitate you have a misfire,sparkplugs,sparkplug wires,If you dont have coil wire the the COP (coil on plug) either way you have a misfire

Posted on Nov 08, 2012

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Posted on Jan 02, 2017

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SOURCE: I have a 2003 GMC Envoy, trans slipping that I have been towing

Low fluid can cause slipping. (depends upon how low) Most manufacturers post "safe" tow speeds. These are generally ignored. (not good). I recommend towing with driveshafts removed and where driveshaft has a "slip yoke" you install a yoke from a scrapyard and wire it to the tailshaft so it stays in place (keeps oil in and dirt out) Although you can't just detach the tow-bar and drive, it eliminates any possibility of trans damage, since the transmission cannot turn. (most use oil from pump to keep gearsets cool...when towing, pump is not pumping and over time and distance it can damage trans internals.)
Hope your problem is just low fluid and not a rebuild...keep in mind what I said though.

Posted on Jun 09, 2009

  • 1 Answer

SOURCE: I have a 2001 GMC 2500HD. While driving down the

I have a 2001 gmc sierra 2500 HD and when it is cool outside it runs fine, but on hot weather the truck stalls and sometime wont start and this is when the gas is on 1/4, and when we keep the gas tank at a 1/2 it runs fine other than that when you stop at a red light or stop sign and you start to leave it takes offf slowly and its about to shut off and you pump the gas slowly it will slowly start to take off and then when it does runs fine until you stop again. what is my problem with this truck?

Posted on Jun 23, 2010

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1 Answer

WHILE DRIVING


10 Most Common Transmission Problems

www.transmissionrepaircostguide.com/10-common-transmission-proble...
Ever notice that while driving that the car hesitates or refuses to go into gear? ... For automatic transmissions, you might notice that when shifting into drive or park ....Neutral and park gears no problem, but drive, 1st, 2nd and reverse engages ...

Trans Goes Into Neutral While Driving - Transmission ...

www.transmissionrepaircostguide.com/topic/trans-goes-into-neutral/
Jun 5, 2015 - When I put it in drive, and begin to drive away the transmission will put itself in neutral. When I slow back down, it will go back into gear.

Jan 13, 2016 | Cars & Trucks

1 Answer

Hello people i got a gmc 99 jimmy 2door sls the engine light keeps coming on then going out ive coded it to be an iat sensor and also says the iat sensor intermitten voltage high and then the knock sensor...


the IAT may be bad or the connector is bad, real common (friend should know to check that) get a real scanner and see what the IAT is reading, then move the connector and see if it changes. if it reads -40f then its bad or disconnected.

Sep 08, 2011 | 1999 GMC Jimmy

1 Answer

WHAT IS THE CORRECT WAY TO GO FROM TWO WHEEL DRIVE TO 4 WHEEL DRIVE ON A 2003 GMC 2500HD


just shift to 4x4 on the fly as long as you are not going faster than 80 kms an hour.
four wheel drive low gear you will need to stop and put it in neutral, keep the brake to the floor and shift.

Dec 24, 2010 | GMC C2500 Cars & Trucks

1 Answer

Wiring diagram for my 2003 GMC Sierra 1500 HD it has 5 wires at the IAT MAF .


black wire is the 5 volt reference from PCM to IAT. Tan is IAT data signal to PCM. See diagram below.

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Oct 31, 2010 | GMC Sierra 1500HD Cars & Trucks

1 Answer

Replacing temp sensor


Intake Air Temperature Sensor Operation The Intake Air Temperature (IAT) sensor is a variable temperature sensitive resistor. Sensor resistance will change based on air temperature. The higher the temperature, the lower the resistance. The Engine Management System (EMS) provides a reference voltage and monitors the voltage drop between a fixed value internal resistance and the sensor resistance. This is called a voltage divider circuit.
IAT sensor values are used by the EMS to assist with the calculation of idle speed, fuel mixture and spark advance.
Inaccurate voltages from the IAT sensor may affect pulse-width, idle quality and tail pipe emissions. Intermittent signals may cause hesitation, stumble and surging. If an IAT sensor failure accompanies an Engine Coolant Temperature (ECT) sensor failure cooling fan operation may also be affected.
Some manufacturers' incorporate the Intake Air Temperature (IAT) sensor as part of the Mass Air Flow (MAF) sensor, or air flow meter. Refer to current service information for specific applications.
Related Symptoms The following symptoms can be caused by a faulty IAT sensor due to loose connections, bad grounds, high resistance in the circuit, or opens in the circuit.
  • Extended crank time when the engine is cold
  • Poor fuel economy
  • Spark knock

Jul 16, 2010 | 1996 GMC Safari

3 Answers

Wont shift back from 4x4 low, to 2x2


I also have a 2002 Envoy. Shifting to and from 4wh and 4wa can be done on the fly but shifting to 4wL has to be done stoped and while in neutral. Try that. Otherwise I'm afraid its a new computer for you. Its located under the left rear seat and you need a loan for one.

Sep 05, 2009 | 2002 GMC Envoy

2 Answers

OBD 2005 mazda mpv code p0111 iat sensor


Sounds like o2 sencers or cad. converter.

Mar 30, 2009 | 2005 Mazda MPV

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