Question about 2003 GMC Envoy Xl

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My 2003 gmc envoy will not start, it cranks and cranks but does not start. i replace the fuel filter, and cleaned the throttle body. the fuel pump is working. what else could the problem be

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 182 Answers

SOURCE: 1996 GMC Sierra 1500 truck fuel problem

Have you check the injector relay or maybe a fuse for injectors.

Posted on Aug 27, 2008

MNfisherman
  • 11896 Answers

SOURCE: my son's gmc 4.3l hesitates upon acceleration. I

do you have any check engine lights on? If you do, that is the first thing I would have checked. It does sound like plugged EGR, vacuum leak, or bad TPS

Posted on May 15, 2009

csmock132
  • 4669 Answers

SOURCE: 1989 GMC 2500 5.7L - engine surges and stalls at idle. Loses power at cruising speed.

Wow you have replaced a lot of stuff. Lets go back to the Fuel pump. When you replaced it did you replace the hose between the pump and the sending unit. These are common for splitting. Have you hooked up a fuel pressure gauge to check what pressure you have? It should be real close to 13 psi and should raise to at least 18 or 19 when you pinch off the return line.

Posted on Jun 02, 2009

  • 56 Answers

SOURCE: truck cranks but won't start

Check the fuel line it may have a small hole that is allowing air in. If air is getting into the line the fuel will flow back into the tank. Happend to me one day and it turned out to be the clamp.

Posted on Jul 20, 2009

morse008
  • 1111 Answers

SOURCE: How do you replace a fuel pump on a 2003 gmc envoy

unfortunately you will need to drop the gas tank ....you will need a jack and jack stands for safety reasons and some tools sockets - {deep-well} and screwdrivers and patience and hopefully a warm area and pliers ........if you decide to do this first i can give you more detailed assistance on what to expect as well as difficulty level etc.....a few hours i assure you a bit of difficulty depending upon your mechanical skill and health i know i had to have mine sent out as i could only get it 3/4 the way out and i have been an auto/body mechanic and suspension paint metal etc for over 34 years but my health issues restrict me from even the simplest of tasks at times i hope this helps you in making a decision and ...................ensure in fact it truly is the fuel pump 1st have you determined this yet ? a pressure test can be made for free from most parts stores and a few major repair franchises

Posted on Dec 09, 2009

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1 Answer

Changed plugs 04 envoy still hesitant between 20&30mph acceleration after that is slow too. Any answers?????


Wires, distributor, rotor, vacuum leak, O2 sensors, air filter, fuel filter, bad gas. old gas. Throttle positioning sensor, fuel regulator, weak fuel pump, dirty throttle body. Knock out all of the routine maintenance items, check for codes at advanced auto(even if your engine light is not on) and then re-evaluate it from there. And clean your fuel system at your next fill up with a can of B-12 Chem Tool from the additives section at Walmarts auto section.

May 09, 2015 | 2004 GMC Envoy

3 Answers

How do I know when I need a tuneup (spark plugs replaced) on a 2003 GMC Envoy XL (6 cyl). I've owned it for 6.5 years, it is 10 yrs old and I have never had a tuneup. It seems to hesitate a bit


If you change plugs I would thing changing fuel filter and check air filter also. I have a 2007 with 103,000 on it. The owners manual say the original plug are good for 100,000 miles and I changed them at 99,000 just to keep from having to do it on the fly if one of them fouled out. I did pay the 80 dollars to have the fuel system treatment. I do not know now what they called it but they changed the fuel filter also.

Jul 30, 2017 | 2003 GMC Envoy

1 Answer

My 2003 GMC envoy 6cyl wants to die when i turn ac or heater on


The throttle body needs to be cleaned, make sure to clean both the front side and back side, this means that the throttle body needs to be removed from the intake. Also, disconnect the battery while cleaning, this will reset the computer and allow it to relearn to the cleaned throttle body.

Oct 09, 2011 | 2003 GMC Envoy

1 Answer

2003 envoy changed battery out and now when i put on ac truck stalls and dies


The throttle body needs to be cleaned, grime in this area prevents the throttle plate from closing completely and allowing air to enter, making the air/fuel mixture lean. Make sure to clean the front and back sides of the throttle body. Also, disconnect the battery during the cleaning process to allow the computer to reset and relearn to the cleaned throttle body.
When you changed the battery, the computer was reset back to factory settings and with a dirty throttle, the fuel/air mixture is incorrect.

Aug 10, 2011 | 2003 GMC Envoy

1 Answer

2003 Envoy have to crank two or three time before it will start


Have you changed your fuel filter lately? How about a tune up. Those are the things I would look at first and also check the fuel pressure with a fuel pressure gauge to make sure the fuel pump is not getting weak.

May 12, 2011 | 2003 GMC Envoy

1 Answer

Yes ihav e 2003 envoy with 4.2 liter an it has started idiling rough


There are a few things that you can do, do get it idling correctly, and it's fairly inexpensive.

1. Clean your throttle body with throttle body cleaner, with the battery disconnected. Needs to be shiny. When finished, drive around for 20 minutes or so with all accessories turned off, so the computer can relearn the newly cleaned TB. About $7 for the cleaner

2. Replace your spark plugs with A/C Delco 41-103, will idle better with this plug. Around $7 ea
3. Replace your upstream 02 sensor, the one right after the exhaust comes out of the engine, easy to replace. Between $67 and $80, try to stay away from Bosch.
4. Replace your fuel filter around $15 or less.
5. Check your vaccum lines for leaks.

Jan 31, 2011 | 2003 GMC Envoy

1 Answer

The reduced engine power light has been coming on in my 2003 Envoy


1st things first, clean your throttle body with throttle body cleaner. Clean it with the battery disconnected. When finished, drive around for 5 or so miles to reset the computer. The butterfly in throttle body is probably sticking. The throttle body must be nice and shiny when finished.

Jan 12, 2011 | 2003 GMC Envoy

1 Answer

Fuel consumption increasing, now averaging +15 l/100km. Notice engine has a whine to it.


Clean your throttle body for starters. The whine could be a multitude of things, but wouldn't contribute to the loss of fuel. Also, replace your spark plugs with AC Delco 43-103, other Platinum plugs don't work well with Envoys/Trailblazers. Also, probably time for an 02 sensor change, the one upstream in the engine compartment. These things will all help increase fuel mileage.

If you want more mileage...us SEAFOAM in the brake booster, and gas tank to clean the carbon out, but after you run a tank, might as well replace the fuel filter too.

Nov 22, 2010 | 2003 GMC Envoy

1 Answer

2002 ford taurus won't start at first crank in the morning


remove the air filter housing from the throttle body, or if its mult-ported injection, remove the large air duct. Do this the night before. The next day, before cranking and having a spray can of carb. cleaner, spray a couple of shots of carb cleaner either into the large air duct, spray towards the engine, or if its single body injection, spray directly on to the throttle body.

Crank engine immediately, preferrably have some one else sitting in the car to start it after you spray.

If the car even tries to start, replace cold start relay.

Nov 22, 2008 | 2003 Ford Taurus

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