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1990 Ford Bronco Question: my bronco's a85 when I turn over engine theres no spark

 

Question

kjv, 4.9L 6 Cylinder, Suquamish, WA, February 29, 2012, 19:49
 Rookie

I was told to test for spark to take one of the plugs out
and when I turn it over see if it sparks was none ,is this
a way of testing?

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  • Answer #1

    patrick mannion from Greg Solow's Engine Room, February 29, 2012, 20:46
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     Master

    Use caution when checking ignition spark firstly it provides very high voltage (about 15,000 to 40,000 volts) but it is low amperage, it can give an unexpected shock but is unlikely to kill anyone, secondly the spark produced can ignite any flammable gas or liquid (for example gasoline or the gaseous vapors of a lead acid battery). Remove the spark plug wire (or ignition coil if the ignition system on your car is coil over plug type), place an old spark plug with the gap between the electrode and shell of the spark plug "widened" to about .060" or .070" of an inch. Firmly ground the spark plug shell to a good engine ground. Hold the spark plug wire or coil with an insulated pliers and get a friend to crank over the engine while you watch for a pulsing bright spark jumping across the spark plug gap. Look on Youtube for a video on "Check for spark" or Check for ignition spark" I am sure someone has posted a good video clip.
    If you have no secondary high tension spark you have to check what triggers the spark to see where the fault lies. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online

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    kjv, February 29, 2012, 20:58
     Rookie

    thanks alot I'll check that out
    Bronco Mel

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