Question about 2003 GMC Envoy

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MY 2003 ENVOY IS RUNNING ROUGH .. IS THERE A COMMON SENSOR OR SOMTHING THAT GOES OUT THAT COULD BE PROBLM ... ITS LIKE WHEN YOU UNPLUG MASS AIR FLOW SENSOR .. SEEMS LIKE AIR FUEL PROB ...

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

StormStrikes
  • 104 Answers

SOURCE: Emmission codes, Mass air flow sensor

The P0101 code is indeed a code indicating an issue with the MAF sensor. It could be something as simple as cleaning the sensor, or it could be faulty and in need of replacement.

Now, the P1870 code refers to the transmission, and a condition in which the PCM is detecting excessive slipping. That is to say it perceives the transmission slipping as it compares engine speed (RPM) and vehicle speed (MPH) and should a ratio be exceeded then the PCM will set code P1870. I would expect that you would notice a bit harsher shifting in response to this code, particularly on the 1-2 shift as the PCM will command higher fluid pressure to combat the slipping.

Now, it is possible that the an issue with the MAF would cause signals to the PCM to change significantly and to such an extent that the PCM would think something is off with the transmission, so I would start there, with the MAF sensor and see if that helps as it appears you were already thinking.

Posted on Jan 02, 2009

hotrodtod38
  • 141 Answers

SOURCE: Car starts, runs a few seconds then stops.

did you spray the maf sensor or intake hole ?if you didnt spray maf then probly not! have some one turn the key why you listen in the fill gas hole for pump noise ? sould here somthing for 2 seconds at least besure you ear is there before key is turned , also check you ecu fuse to see if it may be blown .? also you could try unhooking battery cable for 20 minutes neg side only then rehook it and try to start it! good luck

Posted on Feb 17, 2009

  • 753 Answers

SOURCE: 3 codes present on my 2002 Envoy. p0172, p0420, and p0340,

Track the p0340 first camshaft timing is very important and could possibly cayse your other codes,Call your local GMC dealer I think I remember a bulletin about this code.

Posted on Aug 23, 2009

michigan man
  • 3533 Answers

SOURCE: I need to clean mass air flow sensor for Mitsubishi Dion

give these websites a try www.alldatadiy.com and www.autozone.com if all fails stop by your local library and get your hands on a Haynes auto repair manual for your car wish you the best of luck Michigan Man.

Posted on Nov 26, 2009

  • 1 Answer

SOURCE: 98 ford ranger 4.0L runs very rough when mass air

When Driving my 98 ranger in the hills it miss fires, what would cause this

Posted on Nov 27, 2009

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3 Answers

My 03 Envoy 4.2l reads ph 300 just put a newer throttle body on it got rid of 2 codes ,runs rough I dont have iridium plugs in it


You need to get rid of that aftermarket air intake . And put the mass air flow sensor back on .

Dec 19, 2016 | 2003 GMC Envoy

3 Answers

2003 Nissan Altima 2.5L Service Engine Soon Light is on, Auto Zone says codes are for MAF and O2 Sensors. Car hard to start after driving a while but when starts appears to run smooth. Auto Zone thi


ok lets start with the codes they say your getting. P??? which 1's and how many. there are few o2 sensors, are they next to the Exhaust next to the converter? MASS AIR FLOW -MAF use this, for now i am guessing, until i see the correct codes your are getting. this could be the 1 you may have below, please read it........
  • P0103
    Mass Air Flow Sensor Circuit High Input
  • Possible causes
  • Faulty mass air flow sensor
    - Intake air leaks
    - Dirty mass air flow sensor
    - Dirty mass air filter
    - Mass air flow sensor harness is open or shorted
    - Mass air flow sensor circuit poor electrical connection
  • Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor.
  • possible symptoms Engine Light ON (or Service Engine Soon Warning Light)
    - Engine stall
    - Engine running rough
    - Excessive fuel consumption
    - Excessive smoke
  • the code is generated when An excessively high voltage from the sensor is sent to Engine Control Module (ECM).
2003 NISSAN Altima Sedan OBDII Codes List

Oct 22, 2014 | 2003 Nissan Altima

1 Answer

Idling rough and hesitating when accelerating


This sounds like the mass airflow sensor.

Jan 21, 2014 | 2003 Suzuki Aerio

1 Answer

My 2003 GMC envoy will start then shut off unless I give it gas why is this


Bad MAF mass air flow sensor, air filter, fuel filter or a vacume leak.

Oct 04, 2011 | 2003 GMC Envoy

2 Answers

Toyota 100 emmits black smoke


You have very rich AFR. Please adjust and fix your fueling system

Jan 24, 2011 | 2003 Toyota Corolla

1 Answer

1987 GTA trans am TPI. it runs rough and rich. i let it run by itself and now it won't start unless i flutter the fuel pedel and then it still runs really rough and won't rev up. what can i look for?


I would suspect either the tps or mas air flow sensor, you can unplug the mass air flow sensor ( located in air tube to throttle body) see if this helps. The mass airflow sensor may need to be replaced. please rate if this helps

Feb 13, 2010 | Pontiac Trans Cars & Trucks

2 Answers

My car won't stay on


your mass air flow sensor or throttle postion sensor is defective, buy one from a junk yard and try itthat way, I also think you can unhook the mass air flow sensor connecter and it should still run if it does then it's the mass air flow sensor. same thwith the throttle postion sensor unplugh it if it runs you will knowwhat the problem is it goes to base timing if it is unplugged.

Jul 18, 2009 | 2003 Pontiac Grand Am

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