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I did a minor tuneup on a 1989 ford econoline 350 with a

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460. It ran fine, the...
I did a minor tuneup on a 1989 ford econoline 350 with a 460. It ran fine, the next day started it and it was missing on number 3 changed plugs to make sure I didn't crack one. Checked timing to make sure it didn't jump time.Checked firing order 3 times. Ran compression on the cylinder 160 psi.Next cylinder was 165 Went and put a second set of wires on it and new second cap and rotor. Then replaced injector on number 3 no change on situation. Put a injector pulse tester on number 3 as well as number 2 no light but I had a kit and another pulse tester from a gm fit when it had the wrong configuration on the pins for the ford one. Is a test light the same as a pulse testor?
Submitted: 1 year ago.Category: Ford
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Answered in 9 minutes by:
11/25/2016
Ford Mechanic: Juan Crespo, Tech Trainer replied 1 year ago
Juan Crespo
Juan Crespo, Tech Trainer
Category: Ford
Satisfied Customers: 1,528
Experience: A.S.E. Master Technician, Advanced Level, Emissions - Asian, Domestic, & European
Verified

Hi there.

A regular test light has very low impedance and might actually damage the injector driver inside the onboard computer. Noid lights are recommended for quick injector pulse checks (click here to see example)

Please let me know if this helps solve your issue or if you need further assistance.

Best Regards.

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Customer reply replied 1 year ago
I used a noid light it didn't light
Ford Mechanic: Juan Crespo, Tech Trainer replied 1 year ago

Try the Noid light on an injector you know is working; if it works there, then the driver for the other one is probably shot.

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Customer reply replied 1 year ago
I tried on another injector no light. Is the noid light bad they are new
Ford Mechanic: Juan Crespo, Tech Trainer replied 1 year ago

If you tried the Noid light on an injector you know is working and it did not flash, then it is bad. Make sure the Noid light is made for testing Bosch-type injectors.

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Customer reply replied 1 year ago
Ok I have a Bosch type but it has different pin spacing can I run jumper wires
Ford Mechanic: Juan Crespo, Tech Trainer replied 1 year ago

Yes, you can.

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Customer reply replied 1 year ago
Its raining like hell here. I will need to continue tomorrow.
Ford Mechanic: Juan Crespo, Tech Trainer replied 1 year ago

I'm usually online 2-8 PM weekdays. Hope to hear from you then.

Best Regards.

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Customer reply replied 1 year ago
cool thanks,is that eastern time
Ford Mechanic: Juan Crespo, Tech Trainer replied 1 year ago

Sorry, I don't work weekends. I'll opt out so other experts can look at your question. Please don't reply until another expert responds.

Best Regards.

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Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago
sprinkles08
sprinkles08, ASE Certified Technician
Category: Ford
Satisfied Customers: 23,499
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
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Hello and welcome to JustAnswer!

Do you still need help?

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Customer reply replied 1 year ago
Hi I am going to hook up a bosch noid light and check to make sure I have a pulse. I will get back to you as soon as I do that. Thanks
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

You're welcome!

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Customer reply replied 1 year ago
The Bosch noid light does not lite on no 2 or 3 1 and 4 lite
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

So you have four cylinders that aren't running?

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Customer reply replied 1 year ago
It seems 3 and 4 no noid on either there is spark through to plugs on those jugs. When I pulled the wires no change
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

Do you have an incandescent test light?

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Customer reply replied 1 year ago
You mean a 12 volt test light? Yes
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

Is it an incandescent bulb?

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Customer reply replied 1 year ago
yep standard napa test light, with a bulb like are in flashlights
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

Can you see if the red wire at the injectors not working will light the test light brightly when the engine is running?

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Customer reply replied 1 year ago
Connected
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

I don't believe your whole post made it to the page, all is see is 'connected'.

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Customer reply replied 1 year ago
Leave the wire connected to the injector or test disnonnected
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

You'd have to disconnect it to contact the pin in the connector.

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Customer reply replied 1 year ago
Ok,thought you wanted me to probe througb
Customer reply replied 1 year ago
Hot to both
Customer reply replied 1 year ago
Red and blask
Customer reply replied 1 year ago
Steady light
Customer reply replied 1 year ago
On both injectors
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

Connect the alligator clip end of the test light to battery positive and probe the terminal for the second wire in the connector. With the engine off does the test light illuminate?

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Customer reply replied 1 year ago
The black or red by second black?
Customer reply replied 1 year ago
Do you meAn the black,wird
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

You already tested the red wire and now are testing the second wire.

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Customer reply replied 1 year ago
The second wire was hot also
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

You tested both wires for power rather than just the red?

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Customer reply replied 1 year ago
When I
I probed the black,it was hot Lso
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

So you connected the test light alligator clip to battery negative, unplugged the injector and touched each terminal individually and they both lit the test light?

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Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

Does power on the second wire go away when cranking?

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Customer reply replied 1 year ago
ill go check
Customer reply replied 1 year ago
Dims does not go away after it starts
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

Compare that to what you're seeing at cylinders that aren't having an issue. Does that not happen on the others?

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Customer reply replied 1 year ago
No
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

Do you have a digital voltmeter? You're going to need to disconnect all injectors and the ECM and test for continuity between the two wires in the two affected injector connectors. You either have an internal failure in the ECM or the wires are shorted together somewhere in the harness.

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Customer reply replied 1 year ago
I need to check the other injector characteristics. Disregard the no on the top answer. What I was thinking is that if that is only happening to the 2 injectors.. Cutting the 2 black wires that run to the injectors and running a new ground. I aint there yet lol. Where is the ecm located?
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

It's in the right side of the engine compartment under the blower motor area.

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Customer reply replied 1 year ago
Just checked known good injector. Black stays solid light, red wire shows pulse in light. So it appears there is no pulse to the 2 red wires on the bad injectors
Customer reply replied 1 year ago
Thanks for sticking with me on my little twilight zone lol
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

The red wire is a constant power feed, ground is pulsed on the opposite wire to control the injector.

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Customer reply replied 1 year ago
hmm seems that the pulse was on the red wire.
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

The driver wire for 3 is black/white, 4 is light green.

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Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

The same red wire powers all injectors and a handful of solenoids together. The driver wire to each injector that pulses ground is the wire that is not the same color at each injector.

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Customer reply replied 1 year ago
I will need to double check It looks like the each injector has a red and black wire. I will verify. I am away from the motorhome
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

Each injector has a red wire which is the power feed. The driver wire varies for each injector and is pulsed ground to control it.

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Customer reply replied 1 year ago
should I unbutton the wiring harness. or just run countunity tests on the affected wires? The color coded wires run al the way to the ECM correct? Could the fault be at the distributer?
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

The distributor is not related to the fuel injectors.

Yes, the ECM controls the injectors.

If the two wires going to the affected injectors both have positive voltage all the time and the behavior doesn't match what you see at the others then you need to unplug the ECM and injectors to test for continuity between the circuits. If ok then the ECM needs to be replaced.

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Customer reply replied 1 year ago
where is the ecm on the rig
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

It's in the right side of the engine compartment under the blower motor area.

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Customer reply replied 1 year ago
It was inside the pass side how do I get it to come out
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

Correct, that's the right side of the engine compartment if you're in the US.

You don't need to remove it, just unplug the connectors.

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Customer reply replied 1 year ago
Got it
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

Great!

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Customer reply replied 1 year ago
I tested for continuity for 3 is 2nd row 1 and 2 from right. cyl 2 is top row 2nd from right and top row first pin to the left of the bolt hole
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

You tested continuity between the injectors and ECM?

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Customer reply replied 1 year ago
to the pins I described
Customer reply replied 1 year ago
from the non red wires
Customer reply replied 1 year ago
yep
Customer reply replied 1 year ago
it showed 2 live on each injector
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

Did you unplug the injectors and ECM and test for continuity between the driver and power feed wire at the two affected injectors?

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Customer reply replied 1 year ago
Had,continuity between non red wires,on, 2 an3
Customer reply replied 1 year ago
To the 2, pins on each I described earlier
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

If you have continuity between the two circuits with the injector and ECM unplugged then the wires are shorted together in the harness.

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Customer reply replied 1 year ago
what I meant is that Testing the non red wires 2 pins were active for each injector tester on the ecu
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

You don't need to do anything at the ECM other than unplug it.

You're unplugging the ECM, unplug the two affected injectors and check for continuity between the terminals. If there is continuity with the ECM unplugged then the circuits are shorted together in the harness.

If they are not shorted together or to power or ground with the ECM unplugged then replace the ECM.

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Customer reply replied 1 year ago
Bear with me on this. So I unplugged the affected injectors. I mran a jumper wire from the non red injectors on the unpluged injector wires to the ecm I had continuity between thise wires to the ecm pins and have continuity29 November 2016 09:51
So I tested for continuity for 3 is 2nd row 1 and 2 from right. cyl 2 is top row 2nd from right and top row first pin to the left of the bolt hole. There is continuity there
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

Unplug the ECM.

Unplug the injectors.

One test lead goes to one terminal in the injector.

The second lead goes to the second terminal.

If continuity is shown then you have a wiring problem.

If an open circuit is shown then you need an ECM.

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Customer reply replied 1 year ago
I disconnected the ecm I tested for continuity on each injector. 2 female pins on the harness were live for each cylinder, So does it go non red into the ecm through the processor and out and back to the injector. which would explane conttinuity on 2 lines
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

You unplugged the ECM and injectors and found two wires in the injector connector had continuity to each other?

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Customer reply replied 1 year ago
ya but after passing through the ecm like continuity into the first pin on top and 2nd pin on top. So if it was plugged in it would be juice in then through the ecm and juice out. Does this make sence
Customer reply replied 1 year ago
ya need juice into the ecm then through the processor and timed joice out or vice versa
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

You're not concerned with the engine controller. You're testing the wiring with the controller unplugged.

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Customer reply replied 1 year ago
correct again thanks for your patience on this issue
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

You're welcome!

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Customer reply replied 1 year ago
yep ecm unpluged testing continuity on the female end of the connection block. had continuity on 4 total like I said must be hot from the injector then through the ecm back to the injector from each of the 2 injectors. Am I correct on the assumption. I need to go fix another rig I will be back this evening. Again thank you
Kevin B
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

If the two wires in a connector show continuity with the ECM and injector unplugged then the circuits are shorted together in the wiring harness.

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Customer reply replied 1 year ago
is there a likely place for a short. In the event I can't locate the short. can I run wires to bypas it?
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

The short could be anywhere in the harness. Yes, cutting the old wires and running new is acceptable if you're not able to find the problem area.

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Customer reply replied 1 year ago
I had to take the day off
Ford Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

Ok.

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