Ford

Have Ford Questions? Ask a Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Ford
This answer was rated:

I am having the same fuel injector curse it looks like many…

I am having the same...
I am having the same fuel injector curse it looks like many others have had. Truck is a 1990 F250 with a 7.5L/460. I have spark and compression and have set timing. I have check all grounds that I can find. I have battery voltage at the eec relay, in and out. Ground looked poor so I gave it a temporary good ground. I have even replaced the ecu in desperation. I have power on both wires at the injector with the ignition on. If I supply a ground to either wire the injector opens and I can hear and see fuel enter the cylinder. Here's the interesting part. After supplying the injector with a ground I loose my battery voltage on the other wire until I cycle the key. Ideas?
Show More
Show Less
Ask Your Own Ford Question
Answered in 5 days by:
11/16/2017
Chris (aka- Moose)
Chris (aka- Moose), Technician
Category: Ford
Satisfied Customers: 50,383
Experience: 16 years experience
Verified

I am sorry no one has helped You slipped through the cracks or all have viewed and passed. Is there more you can add to your post which may help us more so we can help you. Another option is to just write out another concern you may have and we can try to help on that. I do not want you to feel like we are a scam or avoiding you. We want to help you but we want to make sure the help we provide is not in vain and you will be pleased.

Chris

Ask Your Own Ford Question
Customer reply replied 3 months ago
I am not sure what addition information I can give. I thought I was fairly thorough. Maybe the whole message didn't come through? If that was the case I will cut/paste the original. If you already have the info please let me know what additional information you would like. Thanks for responding.
I am having the same fuel injector curse it looks like many others have had. Truck is a 1990 F250 with a 7.5L/460. I have spark and compression and have set timing. I have check all grounds that I can find. I have battery voltage at the eec relay, in and out. Ground looked poor so I gave it atemporary good ground. I have even replaced the ecu in desperation. I have power on both wires at the injector with the ignition on. If I supply a ground to either wire the injector opens and I can hear and see fuel enter the cylinder. Here's the interesting part. After supplying the injector with a ground I loose my battery voltage on the other wire until I cycle the key. Ideas?

When you lose voltage on the red wire to the injector with the key on. Is the red wire at the idle air bypass solenoid also no longer powered?

Ask Your Own Ford Question
Customer reply replied 3 months ago
I will check when I get home this evening. Thanks

Fine by me.

Ask Your Own Ford Question
Customer reply replied 3 months ago
Sorry for the delay is getting back to you. We have had some nasty cold weather here. I went back out and supplied ground to the injector. This time I did not lose power like before. Maybe the first time I check it my back probe wasn't as tight as I thought and I only thought I lost power. I checked the red wire at the idle air bypass valve and it also has power.

So is the fuel injector now working?

Ask Your Own Ford Question
Customer reply replied 3 months ago
No, the injectors are still not working. I made my own led test light and back probed the injector. It flashes on/off when cranking but no fuel is getting into the combustion chamber. The light is somewhat dim when it flashes on. The only thing I can think of is the ground signal from the pcm is weak?

An injector test with a test light is not as efficient as one done with a noid light. If you are getting battery voltage to the injectors and a ground pulse. You can check for a poor ground to the PCM, though I believe the injector may be bad or clogged.

Now that I have posted a partial or complete answer, you will see you can rate me. The deposit you have already paid is not transferred to me until you rate me. I would like to receive nothing less than 5 star excellent ratings. So if we are not there yet, please reply and let me help more. If you're not pleased, let me know because rating bad does not result in a refund, there are better options. Rating now will not close this post nor prevent replying. Thanks Chris

Ask Your Own Ford Question
Customer reply replied 3 months ago
I have no problem rating you at 5 stars. However, I would like to get a little farther on the diagnosis.
I didn't mean to be misleading when I said I made a test light. It is an LED light I got from Radio Shack that already has power/ground wires. I have used this light on several occasions to help me diagnose various concerns with other vehicles. Most recently a Dodge Caravan that wasn't sending signal to the injectors (ironically). This isn't a typical test light used for checking fuses, etc. It works exactly the same as a noid light.
I don't think the injectors are plugged. I have never heard of all injectors in a rail getting plugged at the same time. Besides, the injectors do spray when I give them a power and ground, hence, not plugged. No, I have not done an injector volume test but since I can hear and see fuel entering the cylinder I am thinking it is supplying plenty of fuel.
Can you tell me where the pcm gets it's ground so I can check it? A wiring diagram would be awesome. For whatever reason the Chilton manual I bought has wrong color coded wires when compared to the truck I am working on. I have ran the VIN and triple checked that the truck is in fact a 1990, which it is. Thanks
Chris (aka- Moose)
Chris (aka- Moose), Technician
Category: Ford
Satisfied Customers: 50,383
Experience: 16 years experience
Verified
Chris (aka- Moose) and 87 other Ford Specialists are ready to help you
Ask your own question now
Customer reply replied 3 months ago
Thank you for the wiring diagram. Can you tell me where the pcm gets it's ground from?

I can see in the diagram there are 4 PCM grounds but the vehicle is to old to get a location on the chassis where they connect. You can ohm test them at the PCM and if any fail, add a new ground.

Ask Your Own Ford Question
Customer reply replied 3 months ago
Good point. I will try that this evening or tomorrow.

Super

Ask Your Own Ford Question
Was this answer helpful?
Ask Chris (aka- Moose) Your Own Question
Chris (aka- Moose)
Chris (aka- Moose)
Chris (aka- Moose), Technician
Category: Ford
Satisfied Customers: 50,383
50,383 Satisfied Customers
Experience: 16 years experience

Chris (aka- Moose) is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

AlvinC answered a question about my Ford truck that only someone with an in-depth knowledge of his subject would have known what was going on.

Rich DUSA

Because of your expertise, you armed me with enough ammunition to win the battle with the dealer. They are installing a fuel filter and fuel pump at no charge to me.

MollyUSA

I needed help with my car on Saturday morning....got a response in 5 minutes, and it was the perfect solution. Thanks again to your service.

Jason V.Kirkland, WA

I do know, after going though this with JustAnswer, that I can somewhat trust my mechanic but I will always contact you prior to going there.

BRNew Jersey

I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry.

Stephanie PElm City, NC

used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future.

David L.Richmond, TX

9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much.

PhilMarysville, CA

< Previous | Next >

Meet the Experts:

Ron

Ron

ASE Certified Technician

24,320 satisfied customers

23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs

Chris (aka- Moose)

Chris (aka- Moose)

Technician

50,383 satisfied customers

16 years experience

John Mc

John Mc

Ford Technician

5,495 satisfied customers

19 years Ford Lincoln Mercury experience

Chuck

Chuck

ASE Certified Technician

1,685 satisfied customers

33 Years Experience,Ford Senior Master,ASE Master,L1 Advanced Engine Performance

Cam

Cam

Journeyman Automotive Technician

10 satisfied customers

GM Grand Master Technician 2007. 14 years Automotive experience.

Richard

Richard

ASE Certified Technician

1,524 satisfied customers

12 years at a Ford Lincoln/Mercury and Jaguar dealer as a technician and shop foreman.

Mike V.

Mike V.

Auto Service Technician

1,380 satisfied customers

25 years experience on all makes and models, Licensed NYS Inspector.

< Previous | Next >

Related Ford Questions
I am replaceing a bad fuel injector (4) cylinder. I was able
I am replaceing a bad fuel injector (4) cylinder. I was able to get the upper manifold off but the fuel is still attached to the upper manifold. I got two of the out screws out but I was unable to get… read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
50,383 satisfied customers
What needs to be done to replace the #3 fuel injector on a
What needs to be done to replace the #3 fuel injector on a 2000 windstar 3.8l. What needs to be taken off first, then second, etc;. never attempted this before. I know first remove the wiper blades an… read more
jim
jim
Vocational, Technical or Trade Scho
702 satisfied customers
I need to replace a fuel injector (#5) on a 1990 Ford F-250,
I need to replace a fuel injector (#5) on a 1990 Ford F-250, 7.3 litter diesel. I messed the male threads as part of a reinstall on an rebuilt injector pump.… read more
tim37857
tim37857
Mechanic
High School or GED
71 satisfied customers
I am having the same fuel injector curse it looks like many
I am having the same fuel injector curse it looks like many others have had. Truck is a 1990 F250 with a 7.5L/460. I have spark and compression and have set timing. I have check all grounds that I can… read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
50,383 satisfied customers
How can I find the fuel injectors on my Mercury Grand
How can I find the fuel injectors on my Mercury Grand Marquee 2001? Can I clean the injectors myself? Or must I spend 300 dollars plus at the Ford Garage Service Center. William Hayward… read more
Fordster
Fordster
Mastertech
Vocational, Technical or Trade Scho
2,650 satisfied customers
No power is going to the fuel Injector in my 2008 Ford
No power is going to the fuel Injector in my 2008 Ford Fusion … read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
4,644 satisfied customers
I think my fuel injectors are leaking gas after I installed
I think my fuel injectors are leaking gas after I installed a new coil. And I don't think the coil is set firmly on spark plugs...how can I correct?… read more
6Bucs
6Bucs
Senior Master Tech
Associate Degree
3 satisfied customers
I was changing my spark plugs and unhooked my fuel injector
i was changing my spark plugs and unhooked my fuel injector sencer and loosen the bolts also then alittle gas came out then i put every thing back together and started it and gas was spraying every wa… read more
heavy_chevy_396
heavy_chevy_396
Vocational, Technical or Trade Scho
2,518 satisfied customers
P0272, fuel injector 4 is bad and code p2284. icp sensor.
p0272, fuel injector 4 is bad and code p2284. icp sensor. Trying to figure all this out. problem is it runs like crap when cold. after 10 minutes or so it runs better. Ford put revx in it 2 years ago … read more
kalamykid
kalamykid
Pactor automotive
Vocational, Technical or Trade Scho
97 satisfied customers
Does Ford recommend replacing all fuel injectors when an
Does Ford recommend replacing all fuel injectors when an engine is overhauled/replaced? If so, where? … read more
David Craig
David Craig
OWNER/MECHANIC
Associates
4,627 satisfied customers
Ron. Ive been asked if I could replace fuel injectors on a
Hi Ron. Ive been asked if I could replace fuel injectors on a 1995 ford F350 with a 7.3l diesel. I haven't ever yet, but I'm not much scared to do anything, is this a difficult project to get into?… read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
24,320 satisfied customers
Only four fuel injectors are firing. A gas hog, starts only
Yes, tested fuel injector connections only four are receiving power … read more
Jaybird61
Jaybird61
Master Automotive Mechanic
2,271 satisfied customers
It needs fuel injectors replaces and lines cleaned, as well
it needs fuel injectors replaces and lines cleaned, as well as intake redone … read more
Gunvir Singh
Gunvir Singh
1,877 satisfied customers
Do 1999 ford windstars have fuel injector relay, 176000
Starts normally but quits as soon as it gets to temperature… read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
24,320 satisfied customers
2005 F150 5.4L fuel injectors don't seem to work on the bank
2005 F150 5.4L fuel injectors don't seem to work on the bank that has the fuel rail pressure sensor.… read more
Edward Clayton
Edward Clayton
Associate Degree
1,033 satisfied customers
How do I reprime my fuel injectors on my 2001 Ford windstar,
How do I reprime my fuel injectors on my 2001 Ford windstar … read more
Todd M
Todd M
Owner
ASE Certification
1,573 satisfied customers
I got my oil changed then they did a fuel injector cleaner
Hello, I got my oil changed then they did a fuel injector cleaner to it, I didn't have enough fuel in the tank so they gave me part 2 of after I put gas into it. Came home parked it, Well it hasn't st… read more
Matt
Matt
Engineer
Bachelor\u0027s Degree
5 satisfied customers
Need to know how to remove fuel injector from my 06 f650 it
need to know how to remove fuel injector from my 06 f650 it is a5.9 cummins isb230 … read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
24,320 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x