Rio JB RPM drop after AC turn on

2006 KIA RIO
100,000 MILES • 1.4L • 4 CYL • 2WD • MANUAL
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WIRSHA
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i have kia rio jb hatcback 2006, and i ve already replace Idle speed control with a new one, but idle rpm still drop and sometimes engine turn off or knocking, is that any wiring or something beside ISCV sensor, what i have done :
1. carbon clean
2. replace spark plug
3. replace spark plug wire
4. replace ISCV

thank Q
Jun 20, 2014 at 3:01 AM
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HMAC300
  • ✓ASE Certified Mechanic
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  • ASE Certified Mechanic
try cleaning throttle plate on both sides and iac hole with choke cleaner see if that helps.
Jun 20, 2014 at 6:25 AM
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WIRSHA
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i have already clean TB and both of side the plate with carb. cleaner
Jun 22, 2014 at 5:31 AM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
I can't say anything about the knocking as I can't hear it, but scan for codes and check fuel pressure with a gauge one will show something.
Jun 22, 2014 at 8:14 AM
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WIRSHA
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how to check fuel pressure...?
Jun 22, 2014 at 7:21 PM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
if in U.s . most major autoparts rent the gauge there shold be a shcrader valve on fuel rail if not it will require adapters.
Jun 23, 2014 at 6:44 AM
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