Question about 2003 GMC Envoy

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

Posted by on

3 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • GMC Master
  • 11,022 Answers

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

Posted on Dec 19, 2016

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • GMC Master
  • 14,585 Answers

Where's the MAF sensor? Looks like it didn't get put in with the new air plenum.

Posted on Dec 22, 2016

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • GMC Master
  • 1,110 Answers

On a side note Simon, our 4.2's seem to like only one spark plug.
AC Delco 41-103, which is Iridium, most other brands will have a rougher idle, which is very well documented for our vehicle.

Posted on Dec 22, 2016

5 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

SOURCE: 96 Cavalier. "sometimes" wont start

The fact that you get enhanced ignition by physically enriching the fuel air mix indicates that the normal mix is too lean, either too little fuel or too much air. 1) Check for leaks of un-metered air in to the air ducting and inlet manifold. Look for cracks and poor joints to all vacuum lines including the evaporative emission recovery lines. 2) Check that the EGR valve is closed off at start up: this should stay closed until engine has warmed up. 3) Finally check that the coolant temperature sensor is working OK; the sensor should be informing the ECU that the engine is cold and the ECU responds by ensuring an enriched fuel mix (by prolonging the injection cycle) during engine warm up.

Posted on Jul 26, 2010

Testimonial: "Very helpful. "

  • 4793 Answers

SOURCE: how do you clean a throttle body on 1999 s70?

try this b4 taking things apart... redexe/wynns fuel additive and using high octane fuel the computer will adjust running accordingly...

Posted on Mar 09, 2010

alicantecoli
  • 22095 Answers

SOURCE: I have a 03 gmc envoy. My reduced engine power

sensors on the pedal?? not sure what you mean by paddel though never heard of this term before

Posted on Dec 14, 2009

Testimonial: "03 Envoy:My reduced engine power keeps happening. My car goes 20 mph. Changed throttle body, pedal, wiring. Need new thermostat. Car not heating up."

alicantecoli
  • 22095 Answers

SOURCE: vw polo 1.0 1999, Rough idle, we have cleaned the

right hand side of the intake housing where the butterfly is ----a black plastic box held on with 4 star headed screws ,the carbon tracks inside are pitted and burnt

Posted on Nov 20, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

2004 envoy 4.2L has rough idel @ stop; have replace spark plugs, air filter, cleaned throttle body, replaced 2 oxygen monitors; runs fine on hwy, will idel good @ stop when put in park


With this info, I'm betting motor mounts. If they're bad, make sure and use AC Delco brand. Other brands will tend to crush easier, now you're back with the same problem.

Mar 07, 2017 | 2004 GMC Envoy

1 Answer

My motor reads ph 300 we put a newer throttle body on it droped 2 other codes


P0300 random misfire . Most of the time can be a vacuum leak .

Dec 19, 2016 | Cars & Trucks

1 Answer

What causes I/P lights to blink when put in gear?


2005 Chrysler 300 2.7l Throttle Body Control Warning Light ...

www.cargurus.com > Questions > Chrysler > 300

CarGurusAug 7, 2014 - 2005 Chrysler 300 2.7L throttle body Control warning light or "RED ...bolt starts flashing and the car gets stuck in limp mode or second gear.Missing: p

PCM/TCM Software Updates Will Address Shifting Problems ...

repairpal.com > Problems > Chrysler > 300
Chrysler 300 PCM/TCM Software Updates Will Address Shifting Problems. ... If you experience rough shift and/or shuddering during gear shifting, software ... Car would not go over 20 mph and check engine light along with ABS/BAP light ... Once he put the new battery in the car ran fine for a while and the problems all cam ...Missing: p

ECM with bad connection, causing engine to stall - 2005 ...

? 1:08
https://www.youtube.com/watch?v=IgLe0t5may8
Oct 23, 2011 - Uploaded by SignedOnAsJoe
Check NHTSA chrysler extended the warranty on fuel tanks. ...Any one knows how can I put a used ecm in my 2005 300 do I need to buy new ... How to view fault codes Chyrsler 300 HTWL - Duration: 1:22. by Leo P 28,908 views ... Rough Run, Stumble or Stall, Check Engine Light-How To Check Vehicle ...Missing: blink

Dec 19, 2015 | 2005 Chrysler 300 Touring

1 Answer

02 gmc envoy running rough after disconnecting battery to fix headlight. The truck ran perfect ! I disconnected the battery to replace a new headlight wire and when i plugged the negative line to the


You need to have the throttle body cleaned. On this engine it gets gummed up. Make sure that both front and back sides are cleaned thoroughly.

Apr 08, 2013 | 2002 GMC Envoy

1 Answer

My 2003 gmc envoy has p0303 error code. I have since changed the plugs but the code is still there. What else should I look at before changing the expensive coil on cylinder 3?


To find out if it is the coil pack, swap #3 pack with another cylinder and see if the fault changes. If not, you should check the compression on cylinder #3. If that is OK, I would suspect a bad injector.

Dec 28, 2012 | 2003 GMC Envoy

1 Answer

Changed spark plugs on 2003 gmc envoy 4.2lno runs bad


First of all, did you use AC Delco Iridium plugs part number 41-103? These are the best plugs for this engine.
Second, did you firmly seat the coil pack when reinstalling them on each plug?
If it is running bad, are you getting the Check Engine light coming on? If so, what is the code?
When you changed the plugs, did you disconnect the battery? If you did, the rough running could mean that the throttle body should be cleaned.

Nov 11, 2012 | 2003 GMC Envoy

1 Answer

2003 envoy smells like fumes and idles rough


have you checked for a vacuum leak?pcv attached,no leaks around plenum,engine coolant temp sensor reading right.

May 31, 2012 | 2003 GMC Envoy Xl

1 Answer

REDUCED ENGINE POWER IN A 03 ENVOY


may have a bad throttle body check for codes if you have a p01516 must of the time it is a throttle body problem

Jan 19, 2010 | 2003 GMC Envoy

2 Answers

2004 envoy 4.2 6cyl. runs rough. had a new


take the breather off and take a 10 mm socket to take the coil off easy to get to then take a 5/8 plug socket to take out plugs easy to get to,

Jan 03, 2010 | 2003 GMC Envoy Xl

Not finding what you are looking for?
2003 GMC Envoy Logo

Related Topics:

28 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

74945 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...