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1984 F150, 302--changed the starter solenoid and engine would not fire-put on new coil and engine still will not fire.

Submitted: 466 days and 23 hours ago.
Category: Ford
Value: $9
Status: CLOSED
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Optional Information

Optional Information:
1984 Ford f150 302

Already Tried:
changed starter solinoid changed coil

Posted by AMEDEE 466 days and 23 hours ago.

Answer

Greetings!

We will have to pinpoint what the engine is missing.


Spark


Fuel


Compression



All three of these are tested when the engine is being cranked over. There are two way of checking for fuel. Fuel pressure and fuel trigger. Both are very important and must be present for the engine to start. Fuel pressure is self explanatory. You just hook up the gage and see what the reading is. Fuel trigger is check with a noid light. The injector gets unplugged and the noid light gets plugged in to the injector clip. With the engine cranking over, this light must blink. This is the signal to the injectors from the computer. You can have all the fuel pressure in the world, but it wont matter if the injector is not pulsing gas into the cylinder like it should! Compression tester, spark tester, fuel pressure gage and noid light are all accessible at your local auto store. All three tests play a very important part in diagnosing a no start condition. Be extremely careful when doing these tests.

466 days and 23 hours ago.

Reply

Reply to AMEDEE's Post: The engine is missing spark

Posted by AMEDEE 466 days and 23 hours ago.

Info Request

Do you have power to the coil with the key on?

466 days and 23 hours ago.

Reply

Reply to AMEDEE's Post: How can I test for "fire to the coil when the ignition is on?"

Posted by AMEDEE 466 days and 23 hours ago.

Answer

You can use a voltmeter or a test light. At least one of the wires going to the coil should have battery voltage with the key on

466 days and 23 hours ago.

Reply

Reply to AMEDEE's Post: What if it does not have voltage with the key on?

Answer

Then we will have to trace the wiring until we find the problem.

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Expert: AMEDEE
Pos. Feedback: 98.5 %
Accepts: 
Answered: 8/11/2008

ASE MASTER TECH

ADVANCED LEVEL SPECIALIST

466 days and 22 hours ago.

Reply

Have current to the coil at the distributor end of the plug wire but no spark there when the engine turns over.

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