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Getting the P0103 code. Thought I heard a vacuum leak. Used a hose to my ear to isolate it, but it appears to be air going through the idle air control, as I can't get any engine changes when I spray starting fluid at the area.

When taken out of gear and moving, the idle will stay up in the 1500-1600 range, but will go to 800-900 soon after stopping. That seems like a vacuum leak, and I've tried finding it, but can't. I'm guessing the computer detects we are stopped and the sensors are giving the wrong info. Maybe a TPS problem? Don't have an OBD scanner to see what's really going on.

Car seems to run OK, strong even, except for the occasional (every 30 min or so) major stumble, which occurs just once and goes away for another 30 min or more.

I cleaned MAF sensor with CRC MAF sensor cleaner. Also cleaned what I believe is a temp sensor in the intake upstream of the MAF, using the same cleaner. Is that OK?

Since the Idle Air Control gets air from downstream of the MAF I don't think it is the problem. I think the air I hear going through it is from just doing its job. It seems the throttle shuts off all air from the intake, so all idle air needs to go through the Idle Air Control. Is that right?

I cleaned and oiled the K & N filter the previous owner put on, using the kit you can buy at an auto parts store. Can too much oil cause the P0103 problem?

Vehicle: 2000 Hyundai, Elantra, 2.0L engine

1 Answer

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P0103 MAF circuit high input

You have a vacuum leak, using starter fluid does not find it, it evaporate too quickly and its too flamable. When it comes to having P0103 check the connection once again, is it in correctly and it locking tabs seated? One of the jobs for the ECM is to look for open circuit, short circuit, grounds, and rationality, Having P0103 is capable of suspending any other code that may be present until P0103 is resolved, such as the idle air control being at fault or even the TPS sensor.As for over oiling the airfilter, it can set a P0103 which is when the ECM see a high volume of air entering the engine

 A good way to help find a vacuum leak is move the suspected hose and listen for any hissing noise, such as this PCV hose here at the bend that develop a leak, the use of carburator cleaner was no help in this case, just by moving this hose it can be heard more

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