Wont Start
04-05-2012, 01:20 PM
#1
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Wont Start
Ive been on multiple other forums asking about this. I just bought an 84 F150 with the 4.9L and 4 speed manual. It cranks but wont fire. I just put a bigger battery in and im still not getting spark. It has a new Mallory distributor, coil, solenoid, and regulator. . Looks like someone tried doing the DSII swap because the computer is out and its push button ignition. My buddy says its the safety neutral switch. Ive looked at it and it looks like something is suppose to be plugged into it. Can anyone help with this?
04-16-2012, 09:28 AM
#2
Member
As long as its cranking, it is not the Neutral Safety Switch. If its not getting spark, then either the ignition system is not getting power, or the ignition is bad, or theres just some fault in the ignition wiring. Are you sure the carb is getting an adequate amount of fuel to run?
04-16-2012, 12:46 PM
#3
Senior Member
Mallory distributors cannot be jumped started
As an owner of one, I carry a spare module. If you jump it or even charge
the battery without disconnecting the distributor connector - you can/will
burn out the inside module.
the battery without disconnecting the distributor connector - you can/will
burn out the inside module.
04-16-2012, 12:50 PM
#4
Senior Member
Forgot the test instuctions
What is the Test procedure for checking my Unilite electronic ignition module’s operation?
A: INSTRUCTIONS
Remove both the distributor cap and rotor, then turn the ignition ON but DO NOT START car.
Now connect your Red voltmeter wire to the NEGATIVE terminal (-) on the coil, by attaching the Red lead wire clip from voltmeter to the (-) terminal.
Next attach your Black voltmeter wire to an engine ground on a good ground source. We suggest a manifold, or header bolt. Most anywhere on the engine is good.
Now the voltage should read about 11 to 12 volts at this point. Remember to turn the key on for this reading! 12 volts must be present on your voltmeter.
Next, place a credit card down into the distributor, blocking the 2 photo optic eyes on top the module facing each other on the top. With eyes blocked, the volts should drop way down below 2 volts or less. This drop is a must! If the voltage drops down to anything under 2 volts, then the module is good and ready to use. If the voltage does NOT drop, the module will need to be replaced.
This damage could have been caused by many things, such as: power surge from an alternator, high resistance spark plugs and plug wires, improper ground wires, if someone has given you a jump, if you have given someone a jump, or battery chargers, which can also damage ignition modules. If voltage always stays below 2 volts and never increases up to 11-12 volts, then the module has been spiked by high voltage and needs to be replaced.
NOTE: The lack of a ballast resistor will cause this type of spike. If the voltage only drops down to 3-4 volts, this will produce a weak spark: too weak to run engine and the module will need to be replaced.
A: INSTRUCTIONS
Remove both the distributor cap and rotor, then turn the ignition ON but DO NOT START car.
Now connect your Red voltmeter wire to the NEGATIVE terminal (-) on the coil, by attaching the Red lead wire clip from voltmeter to the (-) terminal.
Next attach your Black voltmeter wire to an engine ground on a good ground source. We suggest a manifold, or header bolt. Most anywhere on the engine is good.
Now the voltage should read about 11 to 12 volts at this point. Remember to turn the key on for this reading! 12 volts must be present on your voltmeter.
Next, place a credit card down into the distributor, blocking the 2 photo optic eyes on top the module facing each other on the top. With eyes blocked, the volts should drop way down below 2 volts or less. This drop is a must! If the voltage drops down to anything under 2 volts, then the module is good and ready to use. If the voltage does NOT drop, the module will need to be replaced.
This damage could have been caused by many things, such as: power surge from an alternator, high resistance spark plugs and plug wires, improper ground wires, if someone has given you a jump, if you have given someone a jump, or battery chargers, which can also damage ignition modules. If voltage always stays below 2 volts and never increases up to 11-12 volts, then the module has been spiked by high voltage and needs to be replaced.
NOTE: The lack of a ballast resistor will cause this type of spike. If the voltage only drops down to 3-4 volts, this will produce a weak spark: too weak to run engine and the module will need to be replaced.
Step one remove distributor, step two smash with large hammer.
