Distributor caps and rotors are responsible for passing the voltage from the ignition coils to the engine’s cylinders in order to ignite the fuel-air mixture inside and power the engine. The coil connects directly to the rotor, and the rotor spins inside the distributor cap.Jul 27, 2011
The distributor is like a traffic cop for electricity. The distributor contains, among other parts, a rotor that spins, and a number of contacts mounted to the distributor cap. Power from the ignition coil is supplied to the rotor. The rotor spins in time with the engine.
The distributor is the component that transfers the voltage from the ignition coil to the spark plugs. The primary components of the distributor include the rotor and the cap, in which the former spins inside the latter. The cap has the output contacts. The distributor is driven by the engine’s camshaft.
What’s happening is that the moisture that’s stuck inside the distributor cap is compromising your spark. … Eventually, as the engine heats up, the moisture in the distributor evaporates, the plug wires warm up and dry out a bit, and the cylinders all fire.
Turn off the vehicle and spray the spark plug wires and the inside and outside of your distributor cap with WD-40. … Using WD-40 to repel water from spark plugs, distributors, alternators, and batteries is a good way to prevent corrosion and keep moisture away.
The power from the ignition switch need to go to the plus side of the coil and the negative goes the the distributor on a 12v system. That should be opposite what it was on a 6v positive ground.
If the ignition coil does not have spark, it’s time to check its wires. Use a test light to check the continuity on the signal wire and power wire on the ignition coil. If both wires are functional but the coil fails to produce spark, the ignition coil or the ignition control module is bad.
One of the most common reasons, is that your distributor cap has a hairline crack that is admitting water and condensation. At times, the distributor cap needs a new gasket, and if the old one is not replaced, it leads to corrosion.
your car keeps stalling: a failing distributor can prevent adequate voltage from reaching the spark plugs. since the engine needs that spark to run, a bad distributor can result your car stalling when it idles.
The ignition coil is the part of your engine that produces high voltage in order to power your cylinders. The distributor is what gets that high voltage from the coil to the right cylinder. … The coil’s ground side connects to breaker points, which are connected by a lever to a cam in the middle of the distributor.
With the electronic ECUs the distribution and making and breaking were all electronically switched – meaning no more mechanical parts to wear. ECUs are generally good for the life of the car making them maintenance free. By the very late 1990’s mechanical distributors were pretty much gone from all cars.
Turn off the vehicle and spray the spark plug wires and the inside and outside of your distributor cap with WD-40. Using WD-40 to repel water from spark plugs, distributors, alternators, and batteries is a good way to prevent corrosion and keep moisture away.
pure alcohol also works, also known as medical grade pure alcohol. pure methanol works very well to remove water, as both alcohols bond to water molecules. I had an 89 Mustang that I just used brake parts cleaner to clean up the inside of the distributor cap. That worked well.
The rotor is attached to the top of the distributor shaft which is driven by the engine’s camshaft and thus synchronized to it. Synchronization to the camshaft is required as the rotor must turn at exactly half the speed of the main crankshaft in the 4-stroke cycle.
When any changes are made to the engine of a car, the ignition timing is adjusted accordingly. If not, you could experience several problems with your engine with improper ignition timing like knocking, hard to start, increase fuel usage, overheating, and reduced power.
Loss of spark is caused by anything that prevents coil voltage from jumping the electrode gap at the end of the spark plug. This includes worn, fouled or damaged spark plugs, bad plug wires or a cracked distributor cap.
Dielectric grease will not hurt anything. Ford even used it from the factory on the older electronic ignition systems to reduce RFI and improve cap and rotor life. The ozone created inside the cap can seriously erode the terminals. I use the grease on my cap and wire terminals inside and out.
Yes, if the points are open and/or the electronic module is NOT CLOSED then you will measure battery voltage on both the coil (+) and coil(-) terminals. Since there is no current flowing through the coil (no path to earth) then both sides of the coil will be at the same potential.
For positive ground the “+” terminal goes to the distributor (to be grounded on the engine block). For negative ground the “-” terminal goes to the distributor (to be grounded on the engine block). The ignition coil is the part of your engine that produces high voltage in order to power your cylinders.
One end of the secondary is grounded (the ‘negative’ terminal), the coil produces the voltage (the ‘battery’) and the output goes out the ‘positive’ terminal to the spark plug, where it jumps the spark gap and returns to ground, completing the circuit.
If you have power to the coil, hold the pointer of your light to the negative side of the coil while your assistant cranks the engine. Your light should flash on and off as the engine spins over, telling you that the switching mechanism in the distributor is working.
There are a few reasons for no spark, new coil pack could be defective, crank sensor, ignition module or bad wire in primary circuit, faulty ECM/PCM. You may have to have a good technician have a look, diagnose and estimate repair. Second link gives detailed instructions for testing and diagnosing coil pack.
The distributor cap are tasked with passing voltage from the ignition coils to the engine’s cylinders through the spark plug wires and plugs themselves to ignite the air and fuel mix. A failing distributor cap will result in rough idle because the voltage is not being sent to the plugs at the proper time, or at all.
Axial play (up/down) should be kept to between 0.010″ and 0.020″. Shims are available to properly set the axial play, but rotational play is set by the gear on the bottom of the distributor shaft and how it meshes into the gear on the back of the cam.
Replacing the distributor cap and rotor at the same time should be completed every 50,000 miles, regardless of whether or not they are damaged. If your vehicle does not put on a lot of miles every year, it’s also a good idea to replace them every three years.
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