MISFIRE" CODES KEEP COMING BACK AND ENGINE WILL RUN ROUGH.

  • Tiny
  • Dbatch
  • 1999 Kia Sportage
  • 95,000 miles

Replaced spark plugs, both coil packs, and o2 sensors. Upon start up, car will run fine for a few seconds, then start to run rough. Scan and will get either #2 or #4 cyl. Misfire code.

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Thursday, June 7th, 2012 AT 12:30 AM

5 Replies

  • Tiny
  • saturntech9
  • Expert
  • 29,872 posts

Have you checked compression yet?

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Thursday, June 7th, 2012 AT 1:14 AM
  • Tiny
  • Dbatch
  • Member

Checked compression, average is about 105 on each cyl. But I dont know what would be a good compression.

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Sunday, June 10th, 2012 AT 1:13 PM
  • Tiny
  • saturntech9
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  • 29,872 posts

You have the 2.0L engine?If so it says compression is 188psi so that would be pretty low compression.

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Monday, June 11th, 2012 AT 7:16 PM
  • Tiny
  • Dbatch
  • Member

Should I find a used head or have this one redone, problem is kind of short on cash. I had to replace the exhaust manifold, it was cracked in two spots about 3" long.

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Monday, June 11th, 2012 AT 9:36 PM
  • Tiny
  • saturntech9
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  • 29,872 posts

Since the compression is low across all the cylinders I would check the cam timing.

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Tuesday, June 12th, 2012 AT 1:05 AM

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