hoff Posted October 24, 2007 Share Posted October 24, 2007 I dont know if this is a comonally known tip or not. I didnt know about it until another member (cant remember who) mentioned it. A few people, including myself, have had problems with the idle dropping right down and even causing the car to cut out. This happened to me last night when sitting in traffic, idle dropped to about 200 rpm! But then i remembered someone saying to switch on the A/C. I did this and hay presto, 3 seconds later the revs picked up to normal again:) I switched the A/C off and never had any further problems. Just thought id share;) Quote Link to comment Share on other sites More sharing options...
hoff Posted October 24, 2007 Author Share Posted October 24, 2007 By the way. Not a long term cure, just an instant fix if it happens. Quote Link to comment Share on other sites More sharing options...
Rob Dublin Posted October 24, 2007 Share Posted October 24, 2007 Doesn't that just increase engine load so the ecu puts more fuel in? Pressing the brake pedal should do something similar. Quote Link to comment Share on other sites More sharing options...
Ian C Posted October 24, 2007 Share Posted October 24, 2007 Doesn't that just increase engine load so the ecu puts more fuel in? Pressing the brake pedal should do something similar. I'd like to see that fully thought-through Quote Link to comment Share on other sites More sharing options...
hoff Posted October 24, 2007 Author Share Posted October 24, 2007 Doesn't that just increase engine load so the ecu puts more fuel in? Pressing the brake pedal should do something similar. I have no idea how it works and i didnt expect it to. But it did, and effectively:) Quote Link to comment Share on other sites More sharing options...
Rob Dublin Posted October 24, 2007 Share Posted October 24, 2007 I'd like to see that fully thought-through Ditto: safe to say won't be by me....! Quote Link to comment Share on other sites More sharing options...
Daston Posted October 24, 2007 Share Posted October 24, 2007 yep break pedle causes 5 extra lights to come on and break servo so causes extra load and increases rev's. Quote Link to comment Share on other sites More sharing options...
bromy Posted October 24, 2007 Share Posted October 24, 2007 Doesn't that just increase engine load so the ecu puts more fuel in? Pressing the brake pedal should do something similar. Only with the sunroof open though;) Quote Link to comment Share on other sites More sharing options...
Ian C Posted October 24, 2007 Share Posted October 24, 2007 Ditto: safe to say won't be by me....! Hehe OK well, engines don't automatically "sense more load". All that happens is that the ECU has some input switches, and when they are switched it knows to perform action X. Such as, the rear demister, the aircon, the brake lights... All cause the ECU to open the idle control valve up some more. Then more air goes in and, completely independantly of whatever gubbins you have switched on, the ECU fuels for the increase in airflow. This in turn gives the engine a bit more power so the revs rise. The brake servo itself is charged off engine vacuum so it doesn't put any extra load on the engine by itself. As the aircon comes in and out intermittently and you have to turn the fan on, you might want to use the rear window demister instead as your idle crutch -Ian Quote Link to comment Share on other sites More sharing options...
hoff Posted October 24, 2007 Author Share Posted October 24, 2007 Graet explination Ian:) Good tip also. Obviously I'll be looking to snuff the problem out properly should it happen again. Quote Link to comment Share on other sites More sharing options...
Daston Posted October 24, 2007 Share Posted October 24, 2007 what are the causes of the problem anyway? I have had it a couple of tines but it seems to go away. Quote Link to comment Share on other sites More sharing options...
Rob Dublin Posted October 24, 2007 Share Posted October 24, 2007 Dodge idle control valve/sensor thingy? ^ | more technical genius. Quote Link to comment Share on other sites More sharing options...
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