PreCycle Injector Clatter/Buzzing
Mountain Pass
Joined: Jan 2021
Posts: 185
Likes: 4
From: Somewhere in the universe
You should test replacing the injectors wiring harness
If still not starting, check the moddule, if not the module, the injectors are the problem
If still not starting, check the moddule, if not the module, the injectors are the problem
Last edited by Simon Espinola; Mar 12, 2021 at 05:48 PM. Reason: Deleted a chineese knockoff ebay link so no one yill buy that crap
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New User
Joined: Mar 2021
Posts: 12
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I am testing the voltage from the harness to the injectors. Does anyone know what voltage I should be getting during the injector clatter? My test light flickers, so I know I am getting electricity to the injectors.
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Lead Driver
Joined: Feb 2011
Posts: 8,241
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From: L.A. (Lower Alabama)
I don’t know it but I think the FICM makes 48v to drive the injector solenoids. The logic side doesn’t need that kind of power. I would expect to see 48v at the connector during normal operation, I guess it might be lower on a buzz test.
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New User
Joined: Mar 2021
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My FICM Main power shows 48v. I am just wondering if the FICM isn't kicking out enough power to each injector and that's why I am getting a no start. My injector clatter is weak and the truck never had a problem starting until all of a sudden.
Lead Driver
Joined: Feb 2011
Posts: 8,241
Likes: 155
From: L.A. (Lower Alabama)
I was addressing the question of what the voltage might be at the injector connector. The power is pulsed very quickly sort of like the signal from a set of points in an old skool distributor. A multimeter, even a modern digital one, may have trouble reading the peaks so it’s likely the reading would wobble some and may be a bit lower than the actual peak to peak voltage that is present. I think to really nail it you would need an oscilloscope.
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New User
Joined: Mar 2021
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You are probably right. I am just trying to find something obvious, so I don't waste more money
I did put a multimeter on the injector connector. The highest it showed precycle was 6 volts and during cranking 5 volts. Do you think this is my problem? or is it 48 volts total with 6 volts going to each injector? If each injector gets the full 48 volts then would you lean FICM. I did check multiple injectors with the same results.
I did put a multimeter on the injector connector. The highest it showed precycle was 6 volts and during cranking 5 volts. Do you think this is my problem? or is it 48 volts total with 6 volts going to each injector? If each injector gets the full 48 volts then would you lean FICM. I did check multiple injectors with the same results.