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Re: 2003 neon idles low
If there is substantial change going from park or neutral to drive, then the transmission is maladjusted.
I could see this also causing the tranny to get hot if creeping along in traffic with frequent stops.
I'd check with your local BBB to find a reputable transmission shop so you can somewhat believe their assessment.
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yes you are right, your previous work caused the problem.
look for a disconnected vacuum hose somewhere from/to the manifold or throttle body, do visual check first with engine off, if you didn't see any disconnected hose, start up the engine and follow the hissing noise.
The 2003 neon alternator is actually controlled by the PCM, so swapping alternator is not possible, you have to add on an alternator and dedicate it to your stereo, I'm researching the same thing, I'll post my solution to this when I figure it out myself!
Idle is factory set and cannot be adjusted, your best bet is checking for cracked hose pipework for air intake at idle,(not at problem under exceleration and driving) Any slight upset to the air /fuel ratio will be most prevelent at idle speeds.Check hoses where the meet metal flanges on manifold intakes and any sharp bends in ppipes.Good luck
In my experience with neon's the sending unit is most likely not the problem. I feel that you will find that the oil pressure is actually low and that the oil pump is going out. If you change the sending unit and it doesn't change then you will know for sure. The sending unit is located on the side of the block near the oil filter. It has one wire and simply unscrews and the new one screws back in and re-attach the wire. Hope this helps. Good luck.
I had a similier issue when I bought a used 95 Neon. Check your spark plug cables for worn surfaces. They like to rub the hood and the valve cover. When they wear down and heat up they discharge to the hood and v/c. This creates low voltage condition that causes the car to nearly die.