Question about 2004 GMC Envoy

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What causes a 2004 envoy to loose power. i have changed spark plugs and wires and changed fuel filter and none of that worked?

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  • GMC Master
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Sensors for the engine control module or the module itself change timing . If something goes wrong, the module goes into what's called the limp in mode. It keeps the engine running so you're not stranded. It only allows limited driveability, just enough to get you home or to a repair shop.

Posted on Jul 24, 2016

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Posted on Jan 02, 2017

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SOURCE: change sparkplugs

go to mechanic

Posted on Oct 04, 2008

2tone2
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SOURCE: where are the spark plugs on a 2004 envoy

The plugs are accessible from the top of the engine, there is an individual coil pack over top of each spark plug (they are kinda egg shaped and they have a little heat sink in them) just pull these out and below you will find the spark plug. you may have to remove the air intake to gain access to them.

Posted on Nov 02, 2008

  • 3 Answers

SOURCE: check engine light 2004 GMC Yukon

When my check engine light went on, it was a oxygen sensor

Posted on Jan 15, 2009

  • 72 Answers

SOURCE: CHANGE SPARK PLUGS

Well first you will want to get the right size spark plug socket , the rigt sized one for your envoy and then next you will want to remove one spark plug wire at a time so you do not cross any of the wires or if you do you will mess up the timing for the envoy now how to remove a spark plug wire, look first at the plug wire and then gentky twist the wire on the end that goes over the spark plug and carefuly pull back but do not break the wire, next with an extention and the socket put the socket over the spark plug and turn the plug counter clock wise until you have removed the plug and then put the new spark plug in and place the spark plug wire back on the spark plug and just repeat the prosses on the rest,agin do them one at a time that is how I change spark plugs and wires and i have been doing it for years.

Posted on Sep 15, 2009

  • 2 Answers

SOURCE: 2003 Yukon, rough idle, extreme power loss,code

My brother had a similar issue with his Ford F-150, he needed the fuel injectors replaced. Good Luck!

Posted on Sep 30, 2009

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1 Answer

The engine will crank but will not start why?


Do you have any codes or an engine light on, in your dash board ? Have you checked for spark at your plugs ? There are many things that could cause a vehicle to not start. Bad camshaft/crankshaft sensors. Poor ground wiring. Defective spark plugs or wires/coils.

Nov 22, 2016 | 2004 GMC Envoy

1 Answer

Bad gas mileage GMc envoy 2002


thats probably what it gets, tune it up, change air and fuel filters, E3 spark plugs, plug wires, what ever it takes to make it run better, drygas in fuel tank, every fill up, (red bottle, has fuel injector cleaner) todays gasoline has 10% ethanol in it, not good for older cars.

Jan 15, 2013 | 2002 GMC Envoy

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What does a major tune up for a 2004 chevy impala consist of? What should be done and needs to be done?


New spark plugs, oil and oil filter, transmission flush and fill, fuel filter, air filter, coolant flush and fill, clean throttle body plate and bore, clean the MAF sensor, replace any loose or cracked vacuum lines, PCV valve, new air filter, new battery.

99% of the time all you should ever need for a tune up is new spark plugs, and a clean air filter and throttle body. But since your inquiry indicated "major" I gave it more critical thought.

Feb 18, 2011 | Chevrolet Impala Cars & Trucks

1 Answer

Hi,,, i have an envoy gmc xuv 2004 ,, all the sudden i got hestitations in the engine,, first i thought it is a fuel problem,,i changed the fuel filter and the air filter but the problem still...


I had a problem with my 2004 envoy where it would not go when pressing on gas. It seemed as though I were tring to pull a heavy trailer behind me but I wasnt. I found out that my catalytic conveter was cloged up. I replaced it and all is good now.

Oct 15, 2010 | 2004 GMC Envoy

1 Answer

Burb is missing. put new fuel filter in plugs,wires.may be water


If one cylinder is missing at idle, it would be useful to know which one. Pulling the plug wires one at a time with insulated pliers would tell us if one does not cause a change.
It could be a fouled plug.
You could switch plugs with another, to verify.

If not spark, could be fuel.
If throttle body, then not likely.
If individual injectors, then pull whole rail off and see if all injectors fire, spray pattern like cone, and none dribbling.

If none of above, then consider intake leak, collapsed lifter, valve adj, etc.

Apr 22, 2010 | 1999 GMC Suburban

2 Answers

My gas mileage is horrible. what can i do to fix


Okay... K&N drop-in filter, NGK V-Power plugs (and NGK wires), run tires 2-4psi over manufacturer's recommendation, replace fuel filter anually, use a good fuel system cleaner every oil change, use synthetic oil in the crankcase, transmission AND differentials, drive with windows up and A/C off (just vents), drive 55mph on freeway (this one is HUGE), slow acceleration and try not to drive short distances. These are all "hyper-mileage" techniques that garner better fuel economy. If there is a mechanical problem causing the fuel economy to be bad, the spark plugs, wires and filters ought to be a help.

i hope this helps out,
matthew

Oct 23, 2009 | 2004 Isuzu Ascender

1 Answer

CHANGE SPARK PLUGS 2004 GMC ENVOY


Well first you will want to get the right size spark plug socket , the rigt sized one for your envoy and then next you will want to remove one spark plug wire at a time so you do not cross any of the wires or if you do you will mess up the timing for the envoy now how to remove a spark plug wire, look first at the plug wire and then gentky twist the wire on the end that goes over the spark plug and carefuly pull back but do not break the wire, next with an extention and the socket put the socket over the spark plug and turn the plug counter clock wise until you have removed the plug and then put the new spark plug in and place the spark plug wire back on the spark plug and just repeat the prosses on the rest,agin do them one at a time that is how I change spark plugs and wires and i have been doing it for years.

Sep 15, 2009 | 2004 GMC Envoy

2 Answers

Reduced engine power


New fuel filter, Spark Plugs & Wires, New air filter.
Tires at max cold psi.
Use a bottle of injector cleaner and change oil every 3k

Aug 19, 2009 | 2002 GMC Envoy

4 Answers

Loss of power/Engine Sputters going up hill


change your fuel filter it may have imputities in the fuel causing the fuel flow problems

Jun 21, 2009 | 2004 Kia Sedona

1 Answer

Poor performance on up hill drive


This could be caused by a low fuel pressure or poor plugs/wires. Do a fuel pressure test, if low replace filter, if still low replace pump. Also replace spark plugs and wires if you have not done so. If check engine light is on you can bring vehicle to local parts store to have them retrive trouble code. Thanks

Jun 08, 2009 | 2004 Mitsubishi Lancer

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