JasChen Posted September 13, 2019 Report Share Posted September 13, 2019 (edited) Basically, the idle speed of my Lupo GTI is about 800-900rpm, but, if I turn on the air condition, it will go up to 1100rpm, even I raise the rpm by myself (to 2000 or 3000), it will go back to 1100rpm when I loose the accelerator. But, if I turn off the air condition at that time, then raise the rpm by myself again then loose the accelerator,it will back to normal rpm (800-900). Would someone please let me know what is the problem? Thx for everybody! Edited September 13, 2019 by JasChen Correct the typo Quote Link to comment Share on other sites More sharing options...
Sausage Posted September 13, 2019 Report Share Posted September 13, 2019 No idea but at a guess i would say ecu is expecting a load that doesnt materialise or there is a problem with belts, pulley clutches or alternator. If aircon works, belts arent slipping, check out alternator is delivering correct volts. Quote Link to comment Share on other sites More sharing options...
mk2 Posted September 13, 2019 Report Share Posted September 13, 2019 If ac is working, then it's possibly low gas. The revs go up deliberately when the switch is engaged to compensate for the increased drag that the compressor places on the engine. Ac uses about 2-3 hp at low revs, more at high (up to 10!). If the ac isn't working, the ECU (computer) doesn't know and ups the revs anyway, which might be what you're seeing. Under normal conditions, as soon as the ac kicks in, the revs stay the same (ish), controlled by the ECU. welcome to club lupo! Quote Link to comment Share on other sites More sharing options...
JasChen Posted September 13, 2019 Author Report Share Posted September 13, 2019 Thx friends, I would like to provide additional information, please help me to evaluate again. 1. This condition is not occurred always, but sometimes. 2. Even this condition occurred when I just start the engine and turn on the AC, if I continue to drive with normal condition, sometimes, it will be back to normal condition. 3. One time, when it occurred, I just turn off the engine then restart again, then also back to normal. please check then give me some recommendations, thx. thx everybody. Quote Link to comment Share on other sites More sharing options...
JasChen Posted September 13, 2019 Author Report Share Posted September 13, 2019 Dear MK2, because, I am not understand the car so detail, so, would you please let me know the low gas meaning (which gas ?)? Thx very much. Quote Link to comment Share on other sites More sharing options...
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