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My 2003 avalanche has a multpile cylinder miss fire and it has done it several times in the past and changing the plugs corrected it. This time I changed the plugs and wires and it wont clear the code

I changed the spark plugs and spark plug wires. This corrected this the last 2 times and isn't working this time. I only have 80,000 miles on it. It has done this since it was new. About every 4 years. This is the first vehicle I have change the plugs and wires on before 100,000 mles

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  • 108 Answers

Sounds like a sensor problem... you may have a faulty mass air flow sensor .. makes car run rich or lean burns plugs out.

Posted on Nov 24, 2014

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6ya6ya
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Posted on Jan 02, 2017

  • 65 Answers

SOURCE: ENGINE WONT TURN OVER

sounds like the timing belt it has a interference engine so if the timing belt broke you could have bent rods and cracked pistons or worse. good luck

Posted on Dec 15, 2008

  • 217 Answers

SOURCE: 1998 Cavalier No Spark in cylinders 1 & 4

ignition mod. grounds,pcm or timing belt could all be it but, I would have to look at timing first.

Posted on Jan 17, 2009

  • 6 Answers

SOURCE: #3 cylinder miss firing--2001 jeep g.c. larado

check from the spark plug back...

Posted on Mar 17, 2009

  • 744 Answers

SOURCE: 2.7 l misfire after changing plugs

From karjunkie:

If the plugs get wet, then you have a spark problem somewhere in the ignition system. Pull a spark plug and hold it against a ground while you turn the engine over. You need to see a fat blue spark. If not, check the distributor, spark plug wires and coils. An easy way to test for spark is with an inexpensive spark tester. This is a device that is readily available at most auto supply stores. If the plugs do not fire properly, check the spark plug wires for fraying or cracking. Next, you need to check the coil(s). If firing voltage is low (weak spark), measure the coil primary and secondary resistance with an ohmmeter. If it is out of specifications, replace the coil. Also, make sure the coil is receiving normal voltage from the PCM or ignition module. If it is low, check the charging system for anything that may be reducing alternator output (battery and alternator cable connections, ground connections and voltage output).

Posted on Mar 22, 2009

ZJLimited
  • 17970 Answers

SOURCE: diagram of spark plug

Check this for 4.6 or 5.4 sizes engine...

2004 Ford Expedition 4.6 liter V-8 VIN "W"

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2004 Ford Expedition 5.4 liter SOHC V-8 VIN "L"

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Hope this help (remember comment and rated this).

Posted on May 05, 2010

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When did the problem start? Before you changed the wires and plugs? Or did it start, AFTER you changed the wires and plugs? Did the problem remain the same BEFORE & AFTER you made the changes?

1 - If the TOY ran fair to Okay before you did the work, then you may have done something wrong when you made the cahages. Check for correct plugs and firing order. Check for cross wiring. With engine runing pull one plug wire off each plug one at a time. Each pulled plug wire will slow down the engine. When you pull a plug wire that doesn't react and does not make any change ON or OFF that cylinder Plug.
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I had this problem two weeks ago. Your old plugs are Iridium. The new plugs you installed are not. Make sure your new plugs are the same as your old ones. The Bosch I had bought looked like normal plugs, but the ones I pulled from my avalanche were pointy and sharp.

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