Question about 2004 GMC Sierra 2500

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2004 GMC sierra cylinder miss fire code

3,5,8 are cylinders .code says miss fire and the amount of times.truck has 68,000 miles

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  • yadayada
    yadayada May 11, 2010

    time for a trip to the dealer for a full diagnostic.

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Have you put new sparks plugs in it. If you havent I would try them first. Only run the ac delco plugs listed for the truck. I have had many people come threw the shop with misfiring and trucks running like **** and come to find out they put bosch or ngk plugs in it. Your manual says there good for 100,000 miles but there really only good for about 75,000 or so. Also run some lucas fuel treatment or b12 chemtool. both you ad straight to the gas tank. If it calls for one can for 20 gallons buy two and double the treatment it wont hurt you engine.

Posted on Mar 01, 2009

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1 Answer

Miss fire number 3 cylinder


Is there a code stored in the PCM isolating #3 cylinder? When was the last time the spark plugs were inspected or replaced? How many miles are on your vehicle?

Sep 20, 2011 | 1998 Plymouth Breeze

1 Answer

Vehicle missing,shaking,engine light comes on


Misfire could be a number of things:
a) spark plugs - change them if used over 15K miles - inspect/regap.
b) spark plug wires - change them if over 15K miles - inspect
c) ECM (electronic control module) - test with HEI (high energy ignition) tester.

The shaking tells me that the engine is running on less than its normal compliment of cylinders - the shaking is produced by the imbalance caused in the engine by one (or more) cylinder(s)
not firing at all.

The "Check Engine" light probably is coming on due the the misfire condition. Go to Pep Boys or
Advance Auto Pats, where they'll tell you (free) your codes causing the "Check Engine' light to be
lit - the code coming from your truck's computer will probably be one or more of:
P0300 - Random/Multiple Cylinder misfire detected
P0301 - Cylinder 1 misfire detected
P0302 - Cylinder 2 misfire detected
P0303 - Cylinder 3 misfire detected
P0304 - Cylinder 4 misfire detected
P0305 - Cylinder 5 misfire detected
P0306 - Cylinder 6 misfire detected
P0307 - Cylinder 7 misfire detected
P0308 - Cylinder 8 misfire detected
P0313 - Misfire detected with low fuel

Jun 23, 2011 | 2004 Ford F150

1 Answer

Have a miss fire on 6 @ 8, have put another head on it cause the other head had a crack in it and still has a miss.


If the injector is pulsing on the cylinders,and the ignition is sparking the spark plug in the cylinder,then it would have to be a valve problem,or the head is leaking in between the cylinders

Aug 16, 2010 | 1998 GMC Sierra

1 Answer

I need the firing order of 1996 gmc engine sierra 5.7liter vortec


For the 1996 GMC SIERRA with 5.7L V8:

Firing Order:
1-8-4-3-6-5-7-2

Cylinders:
.........(back).........
|...8...|........|...7...|
|...6...|........|...5...|
|...4...|........|...3...|
|...2...|........|...1...|
.........(front)

Distributor Connections:
............(back)
Coil--->o
6------->o........o<-------5
4------->o........o<-------3
2------->o........o<-------7
8------->o........o<-------1
.............(front)

Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!

May 30, 2010 | 1996 GMC Sierra

3 Answers

Engine light keeps comeing on mecanic change o2 senser worked for half hour came back on cods keep saying its miss fireing have had this problem for a month know


Start Small work to Big = Saved Money!
The Code(s) should be telling the specific cylinder(s) that are misfiring. Do you know waht the code is?
Target those cylinders 1st before testing the unaffected cylinders.
The following should isolate the problem(s).
1. Spark plugs - take out-reconnect back to wires and test spark plugs for getting sparks. If none: Don't replace them yet. GO TO 2. If the spark plugs are worn, dirty them replace them.
2. Remove spark plugs form end of ignition wires and test for spark from the wire. If none: Don't replace them yet. GO TO 3.
3. Remove the wires from the coil connection and test the coil for spark for each cylinder. If none: Don't replace it yet.
4. Test each spark plug and wires this way.
5. Coil Packs normally provide fire for 2-cylinders at the same time. The two are paired across from one another.
6. Test the coil for fire, amount of fire and if there is both cyclinders firing.
Misfire and the O2 Sensor got replaced??
Good Luck and get back with me if you need additional help or if this solved the problem.

Nov 20, 2009 | 2004 Dodge Intrepid

2 Answers

2005 dodge ram 1500 4.7 misfire cylinder 2 52,000 miles


have a miss fire in 3 and 5 cylinder on a 2005 Ram 1500 4.7 have relpaced coli packs and still does it have a knock in upper engine around miss fire cylinders. what else can i do

Apr 29, 2009 | 2004 Dodge Ram 1500

2 Answers

Miss fire code on computer


What cylinders are throwing the codes?

What are codes being thrown, and their description?

How many miles on the SIerra?

Jan 30, 2009 | 2004 GMC Sierra 2500

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