BOUGHT A 93 F150 5.8L, Drove for 1 week. I started the truckone morning idled for about 2 minutes then died. Discovered that there was NO FIRE. I have replaced Ignition coil,Ignition module ,Ignition switch and Distributor. STILL NO FIRE. Have 12 VOLTS To Coil,12 VOLTS To all fuses(IN DASH AND UNDER HOOD) Ran self check, NO CODES,(did have battery disconnected during ignition module replacement though).. ANY IDEAS WHAT TO DO NOW???PLEASE HELP!!!!

 

my eyes hurt.

 

ha ha. any real help out there????

 

???? that was helpful Have you replaced your starter? Sounds like you did alot to it already maybe something deep in the dash broke.

 

haven,t replaced starter, engine will crank, just no spark, so don't think that is the problem

 

has anybody out there had this kind of problem getting spark???

 

ok so you know you are getting 12 volts to the coil are you getting spark to the distributer?do you have the distributer in right? is the rotor button at #1 cylinder at tdc of the compresion stroke? are you sure that you are not getting spark to the plugs?i would start over and take your time your missing some thing....

 

Yes the distributor is in right. Yes i am sure i am not getting spark to plugs. i am definitely taking my time and have checked everything I know to check. Have been working on the thing since January. At a complete loss of what else i can try.

 

colvin asked if you were getting spark to the distributor. Can you remove the coil wire from the distributor? If so, have someone turn the engine over and place the coil wire within a quarter inch of the engine and see if you can hear or see spark. This works better just before dark so you can see the spark.

 

sorry. meant to say there is no spark AT ALL not at plugs or distributor. will look over everything AGAIN this evening just to make sure I'm not missing something like you suggested will let you know if I find out anything different Let me know if you think of anything else I can try THANXXXX!

 

Do you have 12 volts at the coil then?

 

Hmm...have you thought about swapping out the ECU/ECM? A 1993 Ford would have considerable computer controls/sensors. I would assume spark control/timing would be one of those items...

If you do determine the ECU is the problem, I found a website:
www.ecudirect.com

They appeared to have your ECU for $250 w/ a $75 core charge. I am in no way meaning to promote that website, it is simply one of many that came up when I did a google search. What really struck me as odd was that Autozone's website did not appear to carry an ECU for your truck, neither did JC Whitney...



Just my two cents,
Good Luck!

 

When you said you replaced the dist, was it new and complete with the pick-up coil? Try unplugging the spout wire. If you have a noid light check to see if injectors are pulsing, if not the PCM may not be powered up or dead in the water. In the under hood fuse box swap the PCM relay with another to see if it starts.

 

A bad PCM cannot kill the spark (unless its PIP input is shorted to ground).

I'd bet that either you have a harness/connector problem or one of those "new" parts you installed is defective.

The ignition system is self-contained, for the most part, within the distributor (PIP and spark distribution) and the ignition module. With the SPOUT plug removed, the module runs without any input from the PCM which would normally just modify spark timing, not trigger it.

Disconnect the TPS and check for your +5 Vref. If it is missing, all sorts of bad things happen, including your symtom.

There is a diganostic procedure in the factory service PCED. It will lead you step-by-step through the diagnosis. I'd suggest getting one...

Steve

 

Start with the basics. Pop the distributor cap and make sure the rotor turn when you crank the engine. We've already determined that there is no spark, but it can be caused by something as simple as a bad coil wire. Check for continuity through it. If the ECU isn't calling for a spark, the power to the coil does not get interrupted, which is what causes the spark.

-Joe