Question about Cars & Trucks
I have had the motor die when the car is idle and has the a/c on. The rpm dips down low every 1.5 seconds or so. Turning the a/c off immediately stops the rpm dipping, and puts it back at a constant level.
Posted by Anonymous on
The AC draws power from the engine as the clutch is engaged on the compressor. The dip in the RPMs is the clutch engaging and disengaging when the RPM returns to normal.. it is normal to cycle like how you are stating, but at 1.5 seconds, you might have a mechanic test the freon charge because it sounds like it might be leaking either oil or gas. Normal is to cycle abour every couple of minutes not seconds..
Posted on Apr 10, 2015
Testimonial: "Yea, thanks Stan, I just fixed it today by buying a 30 dollar can of freon with a gauge on it. Somehow it was in the red and had way too much freon."
Most engines have a device of some sort to bump up the idle speed when A/C is on. As you don't tell us what you are working on hard to say what yours has for this purpose.
Posted on Apr 07, 2015
Couple of things to look into since you ruled out the Freon:1. Check your idle regulator in the compressor connections.. The reason is that most cars are programmed to disable the compressor when you are at a high acceleration (push gas pedal hard) so that you have the extra energy to go instead of pushing the compressor around while trying to get out of someone's way. If this is off, it can be confused in knowing if you are accelerating or not and mess with your idle like you are seeing..
2. Check the reed valve in your compressor: If your reed valve is bent open, you will see the same issue because of the fluid not vaporizing through the spray nozzle through the reed valve like it should.. it is simple to check: Is the air super cold in the car or just kind of so-so? Cold is good, and so-so is a blown reed valve. 3. Last check your AC clutch in that it is engaged all the time (watch where the wheel and belt meet to see if it is turning all the time with AC activated or if it is engaging and disengaging with the idle speed changes.. that should be easy to do too.. just look at the compressor wheel at the belt.. If that is not staying engaged all the time, it could be a clutch or coil overheating which drives the clutch.. Let me know how it is going! Also let me know what kind of car you are looking at..
Posted on Apr 27, 2015
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Posted on Jan 02, 2017
Is the engine light on? Check the air inlet hose between the throttle body & MAF sensor for cracks or leaks. Try unplugging the MAF & see if there is any difference
Posted on Apr 17, 2009
SOURCE: My 2004 PT Cruiser 4
You said you just had the spark plugs replaced, could be that a spark plug wire was connected in the wrong spot, I would check that first, also does the car run smoothly going down the road? clogged fuel filter perhaps. Check engine light on? could alse be a sensor. This newer vehicles basically use a computer to control every aspect of the engine as far as keeping it running at top performance and the least amount of emmissions as possible.
Posted on Sep 03, 2010
sounds like you may need a new oil pump
Posted on Jul 31, 2012
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