Question about 2001 Dodge Neon

3 Answers

Multiple cylinder misfire

I recently had a problem with 1 spark plug blowing out, my husband changed all 4 spark plugs and it seemed to be running fine for about a week then it started again. he checked the plugs & the one that kept blowing out doesn't seem to be going all the way in when he tightens it. The other 3 he turns multiple times to tighten & the 1 only turns a couple times before he cant turn it anymore. Any solutions?

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  • Master
  • 272 Answers

Carefully inspect the threads it sounds as if you have a crossthreaded hole that isn't allowing the plug to full seat. You'll need to get the proper size threading die and very carefully recut the threads. Best done in a shop as if anything falls into the cylinder your looking at very expensive repairs. It happens quite frequently with aluminium blocks and needs to be fixed as a spark plug popping out lets hot fuel dump into the engine compartment. Here is a description of such a tool at toolmonger.

It can happen to the best of us: one moment of inattention results in a cross-threaded spark plug hole. You can either install a helicoil and hope for the best, or send it out to have the whole shebang re-tapped. Now you have another option. The Back-Tap can fix that cross-threaded hole from the inside — without pulling the head.
The Back-Tap is a tap with expandable threads and a mandrel to catch errant metal shards. Apply a dab of grease to the mandrel, then place the device in the hole past the damaged threads. As you back it out, the cutters expand out to engage the undamaged threads, then gently reshape the damaged ones. The greased mandrel keeps metal filings from ending up in the cylinder.
The result: a task that could potentially take days and cost hundreds of dollars is done in minutes for less than a hundred bucks.
MAC offers a three-piece kit that includes a 10mm, 12mm, and 14mm Back-Tap for $90. You can buy Individual taps from various sources for about $50 each.

Posted on May 23, 2009

  • rjbeg123 May 25, 2009

    You can find the Mac back tap tool on Amazon.com



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  • Dodge Master
  • 358 Answers

To start with you need to get a spark plug tap or retheader and clean the hole with one or the other.If problem returns you need to replace threads with a helicoil you can buy at your local parts house.

Posted on May 23, 2009

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  • Dodge Master
  • 6,982 Answers

He might be able to use a helicoil in there or a "thread saver" someone along the way stripped out the threads in the head.
When installing plugs in an aluminum head always put antiseize compound on the threads.

Posted on May 23, 2009

  • Richard Scordino May 23, 2009

    Haven't seen the tool the other guy was talking about. I generally run a vacuum cleaner hose with a modified end near the hole as I'm cutting, then crank the engine a couple of times to blow anything that fell in to blow out. About the only good thing about aluminum is that it's relatively soft and generally won't cause damage...The remainder usually blows out the exhaust valve when the engine is fired up...But I like the idea of that new tool wonder if it's small enough to be useful in tight places?

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