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Ron
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 35298
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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I have a 95 f250 with the 460 that is not getting spark I

Customer Question

I have a 95 f250 with the 460 that is not getting spark I have put a test light to cool while cranking and no light also tried spark plug no spark. I have replaced distributor, coil and spark module and have tried a known good ecm. I have 12 v on red and green wire and have power on white and yellow wire with no cranking and does not go to ground as I crank
Submitted: 2 months ago.
Category: Ford
Expert:  Ron replied 2 months ago.

Hello. My name is ***** ***** I am happy to assist you today. Give me just a moment to review your post, and I'll be right back with the help you need.

Expert:  Ron replied 2 months ago.

Do you have key on power at the red power supply wire at the injector?

Are you also lacking injector pulse?

Dose anything change when you disconnect the SPOUT connector?

Customer: replied 2 months ago.
I put a noid light at injector and it does pulse
Expert:  Ron replied 2 months ago.

Did you try disconnecting the SPOUT connector and see if your spark returns?

Customer: replied 2 months ago.
Sorry not familiar with spout connector
Expert:  Ron replied 2 months ago.

The SPOUT connector is the connector that you remove when you need to set base timing. It should be the two wire connector taped to the harness at the ignition module.

Customer: replied 2 months ago.
Two red wires with a fuse between?
Expert:  Ron replied 2 months ago.

They are actually both pink with a bus connector you remove. There is no fuse .

Customer: replied 2 months ago.
This one
Customer: replied 2 months ago.
Jumper
Expert:  Ron replied 2 months ago.

Yes tat is it and Did you not say you had changed the ignition module?

Customer: replied 2 months ago.
If that is the correct harness then no
Customer: replied 2 months ago.
That is correct twice
Expert:  Ron replied 2 months ago.

That is the connector , I asked about the module because it dose not look like a new one. If your sure it is and its okay then we are going to need to do some testing. Are you able to do that if I post the steps?

Customer: replied 2 months ago.
It is a new one but I have an old one just setting there off of another truck I can send another pic if necessary and yes I have a test light and ohm meter I have done the test in the chiton as I understand and willing to try anything
Expert:  Ron replied 2 months ago.

Okay, let try my test steps, they are much more comprehensive then the Chilton steps. See the link below . Let run these steps and see if this will help you get this resolved.

https://dl.dropboxusercontent.com/u/104923897/No%20spark%20Apr%2017.pdf
See the systems wiring diagram in this link for testing reference as well.

https://dl.dropboxusercontent.com/u/104923897/Ignition%20system%20Apr%2017.pdf

Customer: replied 2 months ago.
As I understand
Br and white 5.069v
Gray and orange 11.5 steady down to.565v while bumping starter
Same gray and orange wire no ohm to engine ground or battery ground
Customer: replied 2 months ago.
Ignition on back probing at dust
Pin one no ohm
Pin two 13 ohm
Customer: replied 2 months ago.
Pin 3 13 ohm
Pin7 13 ohm
Pin 8 no ohm
Expert:  Ron replied 2 months ago.

Did you run the steps I sent you.?

Expert:  Ron replied 2 months ago.

Did you check the pip signal out of the distributor?

Customer: replied 2 months ago.
gray and orange went from 11.5 and while bumping down to .565
Expert:  Ron replied 2 months ago.

Your looking for a square wave signal , did you get one from it?

Customer: replied 2 months ago.
On a side note I replaced pip and when still no spark replaced distributor
Expert:  Ron replied 2 months ago.

I think you have a wiring issue, where are you getting these high ohm reading , from where to where are you taking the reading?

Customer: replied 2 months ago.
Do not have lab scope so did it with the second option of voltage drop
Customer: replied 2 months ago.
Back side of distributor plug to battery
Expert:  Ron replied 2 months ago.

You need to ohm then from the distributor to the PCM as well as from the module to the PCM with both unplugged.

Customer: replied 2 months ago.
I ohmed everything and is still disconnected o ohm everywhere except ignition shield on distributor shield
Expert:  Ron replied 2 months ago.

The shield wire is just a ground shield and should not cause a lack of spark. Are these new parts you are replacing ? Something is not right here for sure. If the PCM, distributor , ignition module and coil are okay you should have good spark.

Customer: replied 2 months ago.
Everything is new twice except pcm which came out of good truck but did not stress much for the injectors were firing
Expert:  Ron replied 2 months ago.

Did the truck that the PCM came out of start and run?

Customer: replied 2 months ago.
Expert:  Ron replied 2 months ago.

Well at this point I am out of ideas, this type of problem in most cases caused the either the distributor pick up or a failed module.

Customer: replied 2 months ago.
I took photo of everywhere ohmed to see if I missed something there is a 0 at each test point
Expert:  Ron replied 2 months ago.

Loks like you hit them all, you did also verify you have power to the ignition module and the distributor on the red/green wire correct ?

Customer: replied 2 months ago.
That is correct
Expert:  Ron replied 2 months ago.

Well I am out of ideas at this point. If you would like I can open this up for you and perhaps someone else has something new to add.

Customer: replied 2 months ago.
On my coil between pos and neg I have 0.1ohm and both pos and meg to coil wire post was 7.88 k
Customer: replied 2 months ago.
Cool wire is 7.6k
Expert:  Ron replied 2 months ago.

The resistance from Pos to Negative on the coil with it unhooked should be .8 to 1.6 ohms. Your reading look to low.

The reading from the center tower on the coil to the Pos side should be 77,00 to 10,000 ohms.

Customer: replied 2 months ago.
I get 0.1 it is at least the second coil but I have gotten bad parts before
Expert:  Ron replied 2 months ago.

Why dont you try the new coil on another truck and see if it will run before you consider replacing it.

Customer: replied 2 months ago.
Well I'm lost I'll start again another day
Expert:  Ron replied 2 months ago.

Im here tomorrow if need be.