unstable idling

[jel]

my engine's idling is not stable sometimes i feel like it's turning wild,
when i turn on the airconditioning the idling will increase beyond normal
proportions, maybe somebody out there knows what to do, i have a 1992
daewoo racer gte model

[MMamdouh]

try a spark plug cleanup\replacment, TB and intake cleanup, Idling speed sensor cleanup you know... the whole nine yards.

MMamdouh

[Efratech]

I used to have that problem once on my 1.5 engine...

clean the IAC (idle air control) valve... if this is not enough you will have to replace it...

Efrain.

[GsiTurbo]

could be good to pull the codes from the ECM. Also, does it idle like this when the engine temp is both cold and hot? Or perhaps hot only?

[MMamdouh]

I used to have that problem once on my 1.5 engine...

clean the IAC (idle air control) valve... if this is not enough you will have to replace it...

Efrain.

sensor cleanup always works with me...especially if accociated with a spar plug cleanup

MMamdouh

[asam]

How do you clean a IAC. where is it located on a Leganza?

[MMamdouh]

How do you clean a IAC. where is it located on a Leganza?

on a Leganga?? well... i never worked on a Leggy before but as a rule the IAC sensor is located on the Throttle body, the TB have 2 sensors; the TPS sensor which is directlt attached to the axis of the butterfly and the IAC sensor is right next to it.

when you take it out; spray it with WD 40 and also its mounting port on the TB then clean up with a clean rug then install it back. after that turn the ignition on for 5 seconds then back off three consecutive times to let the ECU remap the sensor then start the car.

some blue somoke might come out of the exhaust... that will be the resedues of the WD 40 burning in the combustion chambre.

if you have more than 40000 Kms on your ride and never did that before; it will be better to take off the whole TB out for some extensive cleanup... the crank case breather dumps so much oil vapor that it contaminates the TB ports and clog them over time.

MMamdouh

[MMamdouh]

also check your vaccum lines.

MMamdouh

[daewooluvr]

also check your vaccum lines.

MMamdouh

This was going to be my suggestion but I wanted to wait and see if anything came from the previous suggestions which might be the case.

[MMamdouh]

i actually forgot about that in my other post, ironically today one of those vaccum lines came detached and caused my car to sputter a bit... when i saw the heading of this post today it just flashed and i had to post it.

MMamdouh

[jel]

Hey guys thanks for your help. My racer has improve a lot.

[MMamdouh]

so glad to know that.

MMamdouh