updated injector ohms testing. HELP PLEASE!!!!!!!
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Senior User
Joined: Nov 2004
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From: Draper, Utah
updated injector ohms testing. HELP PLEASE!!!!!!!
Ok guys let me fill you in on what going on with my truck. it has been running crappy lately so i did the UVHC ohms test on the plug and it came in really high. so i pulled the valve cover hoping to see the plug undone. but it wasn't. so i undid the inside plug from the gasket/ thru plug. i tested the gasket plug thing and it came in fairly good with the ohms test from pin to pin coming in at 0.3.
so then i did the ohms test strait to the UVCH and it came in like this
#7 inj= 10.3
#5 inj= 3.2
#3 inj= 10.5
#1 inj= 10.5
so then i switched the square solenoid thing on top of the injector. i took the #7 one off and plugged it onto the #5 harness like it shows in the pics. then tested #5 again in the plug and it came up to the same 3.2 before i put it on the #5 wires i tested it strait to the little pins inside the solenoid itself and it came up 3.0
so i am assuming that the UVCH is bad...... am i on the right track.
If i were to take all the solenoids off the injectors and test them by themselves and they all come in under 5.0 ohms then it makes sense that the UVCH is bad right.....
any help or input would be greatly appreciated. thanks guys.
so then i did the ohms test strait to the UVCH and it came in like this
#7 inj= 10.3
#5 inj= 3.2
#3 inj= 10.5
#1 inj= 10.5
so then i switched the square solenoid thing on top of the injector. i took the #7 one off and plugged it onto the #5 harness like it shows in the pics. then tested #5 again in the plug and it came up to the same 3.2 before i put it on the #5 wires i tested it strait to the little pins inside the solenoid itself and it came up 3.0
so i am assuming that the UVCH is bad...... am i on the right track.
If i were to take all the solenoids off the injectors and test them by themselves and they all come in under 5.0 ohms then it makes sense that the UVCH is bad right.....
any help or input would be greatly appreciated. thanks guys.
Go Bills !
Joined: Jan 2008
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From: Buffalo, NY
Sounds like your doing what i would be doing if i was in your shoes. Trying to narrow it down to the exact problem..
If you tried the ohm test right at the injector coil connector and you got 3. Then plug in the UVCH and check it at the plug and got 10. Then i would say UVCH. Must be a short or something inside the connector.
If you tried the ohm test right at the injector coil connector and you got 3. Then plug in the UVCH and check it at the plug and got 10. Then i would say UVCH. Must be a short or something inside the connector.
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Senior User
Joined: Nov 2004
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From: Draper, Utah
that's what i though...
if i take all the injector coil's and check them right in the 2 pins that come out of the coil and they are all under 5 then the harness should be bad right.....
what if one of the injector coils are above 5 like 10.2 or whatever i got in the first test what does that tell me that the injector is bad???????
if i take all the injector coil's and check them right in the 2 pins that come out of the coil and they are all under 5 then the harness should be bad right.....
what if one of the injector coils are above 5 like 10.2 or whatever i got in the first test what does that tell me that the injector is bad???????
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Senior User
Joined: Nov 2004
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From: Draper, Utah
anyone else got any ideas or comments before i go and buy UVCH
and would it be a good idea to replace the gasket so i get a new connector there also. where can i get this stuff
thanks for your input
and would it be a good idea to replace the gasket so i get a new connector there also. where can i get this stuff
thanks for your input
Fleet Owner
Joined: Jun 2004
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From: Rio Rico, AZ.
They will come to the counter with Ford emblems on them, too!
Ask for whatever you need for a (your year of production) T444E engine.
That is International's version of the PSD engine.
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Senior User
Joined: Nov 2004
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From: Draper, Utah
i only tested the one that i took off and it was 3.1 ohms. but i will test the rest tonight. and the other side didn't test high when i did the test with the valve cover on. but i will probably replace both sides.
if i test just the coil's and they come up under 5 ohms then the harness is bad right.
and what if i test one of the coils and it still reads like 10.2 what does that mean.
thanks for your help guys.
if i test just the coil's and they come up under 5 ohms then the harness is bad right.
and what if i test one of the coils and it still reads like 10.2 what does that mean.
thanks for your help guys.
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Go Bills !
Joined: Jan 2008
Posts: 2,778
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From: Buffalo, NY
I never encountered a bad coil or harness yet. So my experience in this is NOT.. But i understanding the testing and what the results could mean .
If you read ok at the coils i would say you coils are ok and your harness is shot. I wouldn't get both sides if the other is ok. Go with the one.. If the harnesses and gaskets come in a kit. Then just store the other one. Why replace the good side if it aint broken. It may never fail. If the coils individually reading high. Then i would say the coils need to be replaced. Not sure if you can get just coils. Never shopped for them.
I wonder now.. If one coil shorts out will it give a false reading of other injectors failing coil test through the connector? Seeing the common is shared? Just a thought.
Test at the coils tonight and let us know. If the coils read fine. Then the it has to be the harness i would think. If your getting a bad coil(s) reading then someone else will have to respond on how to proceed. it would be a first for me on rebuilding that.
My reading experience on this forum says that 10.2 is a bad coil.
If you read ok at the coils i would say you coils are ok and your harness is shot. I wouldn't get both sides if the other is ok. Go with the one.. If the harnesses and gaskets come in a kit. Then just store the other one. Why replace the good side if it aint broken. It may never fail. If the coils individually reading high. Then i would say the coils need to be replaced. Not sure if you can get just coils. Never shopped for them.
I wonder now.. If one coil shorts out will it give a false reading of other injectors failing coil test through the connector? Seeing the common is shared? Just a thought.
Test at the coils tonight and let us know. If the coils read fine. Then the it has to be the harness i would think. If your getting a bad coil(s) reading then someone else will have to respond on how to proceed. it would be a first for me on rebuilding that.
My reading experience on this forum says that 10.2 is a bad coil.
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Post Fiend
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From: Texas
Have you tried swapping the gasket and harness from one side to the other to see if your ohm test follows any particular part? (I'd swap the gasket first since it's easiest.)
You could also just plug the #5 connector into each injector on that side to check the ohm readings of the injectors. Sounds like a gasket / harness issue to me. As Dan mentioned, visit the local IH shop.
You could also just plug the #5 connector into each injector on that side to check the ohm readings of the injectors. Sounds like a gasket / harness issue to me. As Dan mentioned, visit the local IH shop.
Thread Starter
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Senior User
Joined: Nov 2004
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From: Draper, Utah
Have you tried swapping the gasket and harness from one side to the other to see if your ohm test follows any particular part? (I'd swap the gasket first since it's easiest.)
You could also just plug the #5 connector into each injector on that side to check the ohm readings of the injectors. Sounds like a gasket / harness issue to me. As Dan mentioned, visit the local IH shop.
You could also just plug the #5 connector into each injector on that side to check the ohm readings of the injectors. Sounds like a gasket / harness issue to me. As Dan mentioned, visit the local IH shop.
Unless anyone see's any other problems i might have.
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Senior User
Joined: Nov 2004
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From: Draper, Utah
ok guys here is an update
i checked all the coils on the passenger side and they are good and come in at about 3.2 ohms. i also checked the harness all by its self and found out that the common wire was bad. it came in at about 8.6 ohms on all cylinders.
so after seeing that i took of the drivers side just to check it. all the cylinders were good with 3.2 except for the #1. it was like 6.5, which wasn't that bad. but then i started wiggling the connector while my friend held the ohm meter on and it jumped from 6 to 48 ohms and everywhere in between. so i decided to replace that one as well. i noticed that one of the valve cover gasket's plug's pins was kinda loose so while i was at international today i also got to gaskets just to be sure lol. so tomorrow i will be installing all this and i'll let you know how it runs.
should i do the quarter mod on these new harness or will they be good because they are a newer version or something.
i checked all the coils on the passenger side and they are good and come in at about 3.2 ohms. i also checked the harness all by its self and found out that the common wire was bad. it came in at about 8.6 ohms on all cylinders.
so after seeing that i took of the drivers side just to check it. all the cylinders were good with 3.2 except for the #1. it was like 6.5, which wasn't that bad. but then i started wiggling the connector while my friend held the ohm meter on and it jumped from 6 to 48 ohms and everywhere in between. so i decided to replace that one as well. i noticed that one of the valve cover gasket's plug's pins was kinda loose so while i was at international today i also got to gaskets just to be sure lol. so tomorrow i will be installing all this and i'll let you know how it runs.
should i do the quarter mod on these new harness or will they be good because they are a newer version or something.
Post Fiend
Joined: Mar 2007
Posts: 26,966
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From: Texas
The newer version should be updated so no need for the quarter trick. The way to find out for sure is to try and slide a quarter in there. If it only goes in about 1/3 of the way and stops, then no need for the quarters.
Edit: Glad to hear you found it. I bet this fixes it.
Edit: Glad to hear you found it. I bet this fixes it.
New User
Joined: Sep 2015
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I've ohmed the pins at the 42 pin connector (driverside valve cover).
All 8 injectors are showing ~ 10.1 ohm....yes 10.1 ohm.
I also tested directly to the 9 pin VCH and got the same ~ 10 ohm.
The only code I'm receiving on AE is P1271- High/Low Open
KOEO - Buzz Test - ...P1271 occurs
Thoughts?...
UVCH - on both sides?....
I just had these replaced less than a year ago. Motorcraft.
2001 F-250 Platinum - BTS - Riff Raff Wheel - 4" FloPro - PHP Hydra Tunes - 6637 - Driven Diesel Hutch-Harpoon - Red Head Steering - 35"s No lift - GloPro Gauges - EGT-Pyro-Boost-Trans, Kenwood DVD w/ back up cam, Scan Gauge II, Auto Engenuity Ford Bundle
All 8 injectors are showing ~ 10.1 ohm....yes 10.1 ohm.
I also tested directly to the 9 pin VCH and got the same ~ 10 ohm.
The only code I'm receiving on AE is P1271- High/Low Open
KOEO - Buzz Test - ...P1271 occurs
Thoughts?...
UVCH - on both sides?....
I just had these replaced less than a year ago. Motorcraft.
2001 F-250 Platinum - BTS - Riff Raff Wheel - 4" FloPro - PHP Hydra Tunes - 6637 - Driven Diesel Hutch-Harpoon - Red Head Steering - 35"s No lift - GloPro Gauges - EGT-Pyro-Boost-Trans, Kenwood DVD w/ back up cam, Scan Gauge II, Auto Engenuity Ford Bundle
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
I've ohmed the pins at the 42 pin connector (driverside valve cover).
All 8 injectors are showing ~ 10.1 ohm....yes 10.1 ohm.
I also tested directly to the 9 pin VCH and got the same ~ 10 ohm.
The only code I'm receiving on AE is P1271- High/Low Open
KOEO - Buzz Test - ...P1271 occurs
Thoughts?...
UVCH - on both sides?....
I just had these replaced less than a year ago. Motorcraft.
All 8 injectors are showing ~ 10.1 ohm....yes 10.1 ohm.
I also tested directly to the 9 pin VCH and got the same ~ 10 ohm.
The only code I'm receiving on AE is P1271- High/Low Open
KOEO - Buzz Test - ...P1271 occurs
Thoughts?...
UVCH - on both sides?....
I just had these replaced less than a year ago. Motorcraft.
New User
Joined: Sep 2015
Posts: 11
Likes: 0
Common at the Valve Cover Pin.
Looks like it may be the multimeter probes...they "zeroed"..then when wiggled jumped to ~ 7 ohm, then slowly drained to 4.
Going to grab the fluke tomorrow and update the results. Thanks for the heads up.
Looks like it may be the multimeter probes...they "zeroed"..then when wiggled jumped to ~ 7 ohm, then slowly drained to 4.
Going to grab the fluke tomorrow and update the results. Thanks for the heads up.