Engine stalls on idle when a/c is on and after long drive

[Jeh]

Hi mga sir, kindly share your inputs ulit regarding sa car ko. Namamatay po makina kapag nakaidle (or even when i depress the gas at neutral or cruising) after long drive (say 1hr) and only when the aircon is turned on.

Kapag di po naka-aircon okay naman po. Usually kapag hindi naman po nakaidle nagjejerk na ung car but pagkaengage to neutral at walang apak sa gas, namamatay na makina. Minsan nangyayari ito at minsan naman hindi. Also noticed that the rpm drops (from 800 to 600) when when the aircon is turned on (is this normal?).

The car is ford lynx ghia 1.6 year 2000. Recently changed engine, manual transmission oil, spark plugs, ignition coils and coil packs, cleaned maf sensor, TB and servo. Ano po kaya possible problem?

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[non-vtec]

I think your RPM should go up when you turn on your AC. You might have a problem with the ICV. It should increase the RPM when the AC is on, not the other way around. Kaya siguro you experience engine stall.

Suggest you hook it up with an engine scanner to confirm the problem with your ICV and check the readings of the engine parameters like TPS position, ambient temp, coolant temp and for other possible errors.

[Jeh]

Hi sir. Unfortunately, wala ng available scan ang ford casas for our model. Are there any other way para itest if the icv is failing?

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[Zac_español]

had the same problem before except dun sa namamatay after long drive, had to change ALL the spark plugs and it goes back to normal.

[vvti2.0]

idle up ang problem nyan, mukhang servo mo ang may diperensya.