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Random misfire on 2004 chevy tahoe z71

I change the plugs and wires after the code came saying misfire on cylinder 6 i change the coil now it is misfiring on cylinder 4 i change the coil not it is doing a random misfire

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  • Chevrolet Master
  • 6,674 Answers

Use some electrical spray cleaner or tuner cleaner and give mass air flow sensor a good cleaning. then try it. If that doesn't help, a fuel system pressure test may be smart to confirm proper pressure required is there. Low fuel pressure will cause multiple random misfire as well.

Posted on Feb 18, 2012

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Posted on Jan 02, 2017

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SOURCE: coil pack

Cylinders 2 - 4 - 6 are facing the radiator. Cylinder 2 is closest to the drive belts.

Cylinders 1 - 3 - 5 are facing the firewall, cylinder one closest to the drive belts.

Hope this helps; and Thanks for choosing FixYa for assistance.

Posted on Feb 25, 2009

  • 110 Answers

SOURCE: Random Cylinder Misfire

Get a Haynes manual for your vehicle and use the troubleshooting guide there.  about $20 from amazon, auto parts store or haynes.com.  This WILL save you time and shortcut this and any future diagnosis. Haynes IMHO are top notch and I like them better than some factory service manuals that fgo for $100 and more.

David, 99 Saturn,  Cam position sensor codes seem to indicate a engine timing (not spark, but crankshaft/camshaft sync).  Old timing belts or worn tensioners can cause belts to jump a tooth or two which can have a pretty dramatic effect.  The belt could also be old/dryrot and have lost a tooth or two causing it to jump.  If any of these are the case, or if the timing belt interval is near,  replace timing belt, tensioner, idler roller if present and water pump.  FYI, quality OEM ignition wires shold last at least 10 years.  If they are really bad, you can open the engine compartment on a dark night and you will see sparks arcing between them and/or something metal nearby.  We all replace wires when we are not sure what the problem is, and regardless of what anyone tells you, it only rarely solves anything unless the car is more than 10 years old. 

good luck.

Posted on Oct 30, 2008

SOURCE: Random Cylinder Misfire

Im having the same problem with a 96 buick century. I wondering if its the coil packs. The plugs and wires have 8000miles of use. So i think it shouldnt be them. But same symptoms, engine code P0300.

Posted on Aug 12, 2008

  • 11 Answers

SOURCE: 2002 Lincoln LS misfire on cylinder 6.

A bad coil pack can foul out the spark plugs. I have also been told the computer might need to be reset for around $100. You must use Motorcraft OE plugs for this car to run at its best is what my mechanic told me.

Posted on Aug 05, 2009

  • 3 Answers

SOURCE: 2.2 ecotec engine. Code says random misfire. What

did you fix it? if you did what did you do? i have the same prblm thanks!

Posted on Jan 17, 2010

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2003 sorento 3.5 cranks won't start code 300 302 304 306


The code 300 is a Random/Multiple Cylinder Misfire....a 302 is Cylinder # 2 misfire detected. ..and the same for 304 and 306..being 304 is cylinder 4 misfire and 306 is cylinder 6 misfire...All these at the same time normally is a faulty coil pack..,and or faulty coils...spark plugs.,plug wires.....It should be running horribly or barely ....However it could be internal losing compression.....It could just need a good tune up.....Disconnect battery before changing coils,wires..,or plugs in order to clear the fault codes.....

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Why the loss of power and po300 code?


HARD TO SAY WITH OUT BEING THERE BUT THIS MIGHT HELP .
Crankshaft sensor Was the trouble with my 99 Chevy truck after replacing many components like coil cap rotor wires and so on .
http://www.obd-codes.com/p0102 Code P0300 Causes and Fixes Code p0300 is a code that is generated when your engine has a misfire that is not related to only one cylinder. Sometimes this code will be set in addition to other codes such as p0301 which means that there is a misfire on cylinder 1 (cylinder 1 is the number one cylinder when looking at the firing order. It is generally the forward most cylinder on the engine.). If these engine codes are present as well the you should diagnose those first as they are probably causing code p0300.
This code will set your check engine light and needs to be fixed as soon as possible. If it is not then you will probably need to replace your catalytic converter as well as the problem that is causing your misfire.
There are many causes for this obd code. Since it is a "random misfire" or "multiple misfire" this means that the misfire is on different cylinders and not just one all the time.
Common Causes
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97 chevy tahoe running rough update....


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1 Answer

I'm getting trouble code p0300 (random / multiple misfire) on my 2004 Chevy Tahoe after changing the plugs and wires. The wires were installed in the correct order. Any help would be appreciated. Thanks


Well, I've seen .060 and .035 on Chevies before, but not .040. Call Auto Zone. Tell them what year, make, model, and engine you have. If they tell you it is .040 then I am lost.

Mar 23, 2010 | 2004 Chevrolet Tahoe

1 Answer

I'm getting a p0300 code (random/multiple misfire) on my 2004 Chevy Tahoe after replacing the plugs and wires. The wires were installed in the correct order. Any ideas would be appreciated.


how does it run? if runs good then have code cleared but if not then you need to make sure the wires are pushed all the way on the plugs and coil make sure the plug gap is correct and make sure all the plugs are good and not cracked or damaged, you may have to pull plugs out one by one. did you be chance unplug maybe an injector or coil and for got to plug it in? please let me know what you find and i will help you

Mar 23, 2010 | 2004 Chevrolet Tahoe

1 Answer

I just replaced my plugs/wires on my 2004 z71, still random miss.


I would lean toward a dirty throttle body first.REcheck and make sure one of the wires is not locked in well om plugs. Ususlly from what I found a coil is going to cause to skip most of the time if it is bad.I would attempt fuel treatment and cleaning throttle body real well.

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Do you have any engines codes like P 0300. Sounds like ignition coils ,check input wires to coils if okay replace both coils.I have seen this few times

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