rough idle

2002 HYUNDAI ELANTRA
169,000 MILES • 4 CYL • FWD • MANUAL
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TWOKINGS
  • MEMBER
  • 3 POSTS
I took my car in to the garage to get a tune up and it still runs rough at idle. The system was cleaned out, new plugs, plug wires, and pcv valve. What could still be the problem?
May 7, 2011 at 9:41 AM
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FIXITMR
  • ✓Experienced Mechanic
  • 9,989 POSTS
do a compression test to rule out weak cylinders.
May 7, 2011 at 10:26 AM
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TWOKINGS
  • MEMBER
  • 3 POSTS
If it is weak cylinders; what then? Bad news?
May 7, 2011 at 11:09 AM
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FIXITMR
  • ✓Experienced Mechanic
  • 9,989 POSTS
you could say that. serious engine repairs like valves and pistons/rings could be required.
May 10, 2011 at 1:01 AM
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