Car Repair World

Ford F-350 Ignition Coil Replacement procedure TESTING Ignition Coil Test The ignition coil must be diagnosed separately from the rest of the ignition system. Primary resistance is measured between the two primary (low voltage) coil terminals, with the coil connector disconnected and the ignition switch off. Primary resistance should be 0.3-1.0 ohms. On Dura Spark ignitions, the secondary resistance is measured between the BATT and high voltage (secondary) terminals of the ignition coil with the ignition  OFF  , and the wiring from the coil disconnected. Secondary resistance must be 8,000-11,500 ohms. If resistance tests are okay, but the coil is still suspected, test the coil on a coil tester by following the test equipment manufacturer's instructions for a standard coil. If the reading differs from the original test, check for a defective wiring harness. Ignition Coil Primary Circuit Switching Insert a small straight pin in the wire which runs from t...

Car Ignition Switch Replacement Safety Tip: Always wear safety glasses when working on your vehicle. Wear other personal protective equipment (PPE) when necessary, for example latex gloves or closed toe shoes. 1 Locate your battery. 2 Touch the ground side probe of the DMM to the negative battery post and the power side probe of the DMM to the positive battery post with the vehicle running. 3 Locate your ignition switch. 4 Gain access to the wiring behind the ignition switch. 5 Touch the ground side probe of the DMM to a good known ground (such as an unpainted screw to the body frame or door hinge bolt). 6 Back probe the power side probe of the DMM to the wire that connects the ignition switch to the fuse in the START position. 7 Read the current voltage reading on the DMM. You should have full battery voltage running through the ignition switch at this time. A significant drop (a reading such as 10 Volts or lower) would indicate high resi...

Ignition Timing Adjust Engine Ignition Timing Setting Helpful Information Engine timing must be set to a specific degree in relationship to the crankshaft. If this timing becomes misaligned it can cause low power, poor gas mileage, engine detonation (pinging) and backfiring. On straight 4 and 6 cylinders the number one cylinder is pretty obvious, but on "V" style of engines like the V8 its a little more tricky. The cylinder heads on every "V" style of engine are offset (one is further forward.) The most forward cylinder head is the side of the engine where the number one cylinder is located. Step by step automotive guide on how to adjust or set ignition timing, this article pertains to distributor style of ignition systems only which are featured on older engines. Difficulty Scale: 2 of 10 Begin with the engine "OFF", vehicle on level ground, in park and the emergency brake applied. Step 1  - A timing light is used to detect the initial e...

Ignition Switch Jammed Ignition Switch Stuck Ignition Switch Will Not Turn ON Helpful Information In extreme conditions such as high mileage or a keychain adorned with many ornaments the ignition key can wear causing the key not to work. If the door key is same as the ignition key, the door tumbler can be removed and copied if no frequency chip is installed. Dirt and debris inside the key lock can cause the tumbler assembly to stick and jam, not allowing one or more of the key followers to operate. To service a key lock tumbler, spray pressurized air along with an aerosol cleaner into the lock assembly, once clean apply a light lubricant to the tumbler. Vehicles equipped with an automatic transmission utilize an interlock cable that prevents the transmission to be moved from the park position. Though rare, if the gear shift selector is not completely in park it can cause the ignition switch to jam. Step by step guide on how to repair an automotive ignition switch th...

Ignition Coil Testing For Previous part Click Part 1 Step 15  - After the mounting bolt has been removed, gently lift the coil from the plug well. Removing Ignition Coil Step 16  - After gently removing the coil from the spark plug well, insect the coil for any broken pieces or cracks in the housing which are an indication of failure. Ignition Coil Removed Step 17  - This next test will need a voltmeter set to ohms. Voltmeter Set To Ohms Step 18  - With the coil removed, attach the voltmeter leads to either coil terminal ( small wire connector.) Connect Voltmeter Leads Step 19  - Once the volt meter is connected obtain the reading provided, if this ignition coil was bad the reading would much higher. Coil Ohms Reading Step 20  - After reconnecting the ignition coil to the wiring harness, observe the electric...