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I am pretty sure that it is computer controlled. There is probably an input to the computer that is out of whack. There may be a code stored it the computer that may elude to the problem. If an input like a mass air flow sensor or crankshaft sensor is going bad, it will report false data to the ECM and it will make an incorrect adjustment that will flood or starve the fuel/air mixture causing a stall.

easier, try to clean or maybe change the IDLE AIR CONTROL VALVE, located near the throttle body, where the air intake is, it's not difficult, it's attached with 2 bolts, then it's like a pintle with one spring, check the spring shape and replace the unit with a new one, this valve controls the air flow to your engine and if it goes bad , the RPMS are likely to be low and also stalling could occur right away when you start the engine or suddenly too

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โˆ™ 2015-07-15 21:07:42
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Q: How do you adjust the idle speed on a 93 Plymouth van 33l FWD when the engine idles about 650-700 sometimes dropping to 500rpm and stalling?
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Yes, The best way is to a diamond core bit and a drill press, mount the figurine on the drill press firmly but very carefully, the object is to keep the figurine from moving, so use padding. Once mounted, slowly lower the bit until you touch the part "LIGHTLY", very lightly, apply a lubricant, water is fine, the water will rinse the particles away, continue to apply light pressure with continued drops of water, (TIP: if water has a paste texture add more water, it should be watery at all times) the object is to cut through, not punch through and chip the figurine, so be patience and proceed slowly, once through you can radius the edge with fine emory cloth, 320 grit will do. Another tip: you can make a dam with clay to in-circle the hole your going to make and fill with water, and speeds for the drill bit should be: 1/2" 800rpm, 1" 500rpm, 2" 350rpm, an excellent site that will answer all your questions is <www.diamond-drill-bit-andtool.com>.


What can you do if a new engine has an idle speed at 500rpm that's steady but not right?

Review the data for the vehicle online at a free information site, like the troubleshooting at autozone's site, or buy a manual for your model to get the correct idle speed. Normally, adjusting idle speed correctly requires setting the car to a diagnostic mode. This is often done by shorting specific connectors on a diagnostic connector, ensuring the vehicle is warmed up, the AC is off, it is in Park, and all accessories are turned off. In diagnostic mode, you should be able to set the timing (using a light normally) by rotating the distributor (for cars with distributors only). While you are in that mode, you can also check the idle speed, and adjust if your idle control system allows adjustment. Many vehicles do not allow or make no provision for adjustment. While timing can affect idle, the statement "I think you should advance the timing by adjusting the distributer a little until the RPM goes to where you need it" is not accurate. Set the timing to the specified value, then adjust idle speed. Advancing timing too far causes increased NOx emissions and stress or pinging, (and more power, to a point), reducing it too far causes loss of power and can burn valves. If your idle is still not stable after setting it to the specified value, begin troubleshooting per normal techniques.. like, checking EGR, for vacuum leaks, ignition issues, fuel delivery, etc.


No reference to autos How do you calculate the horse power and torque created by a 40 lb flywheel spinning at 500rmp?

Quick answer: "impossible". Spinning flywheels don't create energy. The horsepower and torque necessary to spin a flywheel up to 500rpm must come from somewhere. That being said, there are unnamed variables which make the calculation of how much kinetic energy is stored in a 40 pound flywheel impossible. How big is the flywheel? Is it a uniformly dense disk? Is most of the weight on the edge, with spokes? Too many variables, and the maths would be well beyond me. Finally, horsepower and torque are the wrong way to think about energy unless you are referring to autos, or at least automobile style engines. Horsepower is the capacity of an engine to speed something up. Torque is how much pulling power an engine has. Examples: putting a giant flywheel in an engine will lower its horsepower measurably, because the engine will need to put energy into getting the flywheel up to speed. On the other hand, a flywheel, whatever the size, doesn't affect an engines torque. A truck with a hugely heavy flywheel on the engine can still tow the same load, since the energy going into spinning the flywheel up to speed is still energy contained by the drivetrain. Big rigs have giant straight six Diesel engines with a long crankshaft, huge flywheel, heavy wheels and axels, and they might typically have 300 horsepower. However, all that spinning weight does nothing to the torque figures, which can exceed 1,000 foot pounds. Typically, automobiles have HP and torque figures within a few percent of each other.