2001 Kia Sephia engine vibration

2001 KIA SEPHIA
118,000 MILES
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BDBSNOWBOARDER
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  • 2 POSTS
At idle while in drive/reverse the engine idles very rough. There is no CEL. I have changed spark plugs, wires, coils, disassembled the throttle body and cleaned it along with the IAC, replaced all motor/trans mounts, inspected vacuum hose's, replaced air filter. Still no fix whats next????
Nov 21, 2013 at 7:00 AM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
check fuel pressure with a gauge and check compression auto parts rent gauges
Nov 21, 2013 at 7:04 AM
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BDBSNOWBOARDER
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  • 2 POSTS
what should my pressure and compression be?
Nov 21, 2013 at 7:08 AM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
fuel pressure 46-51psi should be at least 25 psi after engine shutoff for 15 minutes. compression can vary 193 psi is new so if below that ok but there should not be a variance of 20% per cylinder.
Nov 21, 2013 at 7:25 AM
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