Question about 1998 Kia Sephia

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Erratic idling revs up and down, check engine light on, o/d off dash light is flashing

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There is a small electric motor call IDLE AIR CONTROL (IAC).

It add rpm when there is load like headlight,radio,power window while you at idle.

Just to bump up the power a little to keep everything operate smoothly.

When IAC is not functioning it will give you uneven idle.

Get the OBD-II code and repost. It will help you to get to the real problem.

OBD-II connector is 18" from the center of the lower dashboard. Scanner is about $50 to start.


Posted on Jul 15, 2009

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2 Answers

Idles erratically, just changed rocker cover? gasket .now it revs high, not sure why, can I fix this suzuki swift 1990


rocker cover, i edited it for you. (my guess high is over 800rpm)?
hot engine or cold engine or both?
if hot is water temp, 180F? or stuck at 149F"? too low...
are you in neutral or drive? or park.?
which engine?. is it there are many sizes used on Swifts,
one if the largest number of engines on car.
my guess is a "G" engine family.
High idle is usually a vacuum leak,
is this a CARB or EFI engine?, (TBI, throttle body injection:?)
if it is EFI and if TBI
any air leaks will cause too fast hot idle.
here is the list: EFI only ! electronic fuel injected.
  1. Vacuum leaks. (hose left off, or now cracked?)
  2. sticking ISC, idle controller.
  3. TPS set wrong, and no longer has a working idle switch.
  4. ECU in Limphome (if CEL lamp (dash) glows running , bingo)
  5. PVC hose fell off.. sucking in fresh air , and higher idle.
more if you have answers to what your engine and driveline
consist of.




here is the lineup
GEN2 Swifts (the G family used)
1.0 L G10 (LP2) I3
1.0 L G10T (LS3) turbo I3
1.3 L G13A/BA (L72) 8V I4
1.3 L G13B/G13K 16V DOHC I4
1.5 L G15A 16V I4
1.6 L G16 16V I4

Aug 07, 2015 | Suzuki Cars & Trucks

2 Answers

Why do i have an erratic idle on my 2004 Dodge Durango


Don't need a dash light on, to check for codes
& have some in memory

Have to look at all data & the related modules

Aug 27, 2014 | Cars & Trucks

1 Answer

Flashing light on my dash of a engine


hi patricia
FIAT engine light flashing means the ECU needs adaptation,
you can do it yourself just follow this procedure.
( remember not to accelerate unles is stated) start the engine
let it to warm and wait for the cooling fan to come ON then OFF 3 times, like ON,OFF,ON,OFF,ON,OFF. After the fan cuts off the third time accelerate fully down let the engine rev up to 4000 only then leave the accelerator let the engine goes down back to idle, do this 3 times.the engine light should go away.
good luck

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1 Answer

Rough eratic idling


Check the idle air bypass valve see if dirty, cleanable unit. you check the working of valve by powering the unit with 12 volts. check map sensor too.

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1 Answer

Engine revs up at start up and idle goes up and down, after awhile it settles down but idle is erratic


try cleaning your idle air control valve. located on or around the trottle body.

Sep 30, 2009 | 2004 Dodge Ram 1500

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