Injector voltage
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Injector voltage
What are the methods to make sure your injectors are getting proper voltage? I know of measuring at the injectors on the injector harness (should be 12.0v on one bank, 0.0 on the other at any given time, correct?) but can you measure at the fusebox as well with the key on? Just trying to check my wiring to make sure I don't have any issues. I had a no start issue apparently due to my injector wiring, runs fine now but something might be awry.
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Joined: Aug 2009
Posts: 60
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From: New York
Car: 1990 Jeep YJ
Engine: 70's 350 w/87 Z TPI-MAP Conversion
Transmission: Muncie SM 465 Granny Low 1st
Axle/Gears: 4:10 Gears in both axles
Re: Injector voltage
What are the methods to make sure your injectors are getting proper voltage? I know of measuring at the injectors on the injector harness (should be 12.0v on one bank, 0.0 on the other at any given time, correct?) but can you measure at the fusebox as well with the key on? Just trying to check my wiring to make sure I don't have any issues. I had a no start issue apparently due to my injector wiring, runs fine now but something might be awry.
I would also like to know how to properly check the voltage at the fuel injectors. I recently switched from carburetor to TPI and not getting even a pop out of the engine. The engine cranks strong and I have plenty of spark but seemingly no fuel. What caused your problem if you know?
Joined: Apr 2005
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From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: Injector voltage
If the computer does not see the correct signal from the dist when cranking then it won't pulse the injectors.
Best way to check if injectors pulsing is with a noid light
This is assuming the injectors are good , the fuel pump is priming ,you have correct fuel pressure at the rail and and the injector fuses are good
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From: Southeastern Wisconsin
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Re: Injector voltage
I didn't do much to get it going again, at first I replaced the ignition module as I heard it can cause a spark but no injector voltage issue, fuses were fine, just no voltage (or noid light flash) at the injectors. Pressure was fine at the regulator and there was spark. The car is a TPI conversion (from carb) but just wondering if my wiring is causing any issues or something got loose under the dash. I barely moved the injector wiring by the fusebox and there is injector voltage now...happy it runs and seems to be ok but I'd like to find an exact cause so I can fix it if there is a problem and not worry about it 
.
I checked voltage with key on at each injector plug with all unplugged, one side was 11.21 one was 11.26, not sure if that falls into the normal category or not yet. The car also has had some performance issues (too damn slow in the 1/4 for what the car has), wondering if there is a a drop in voltage under WOT if I have something wired incorrectly that still lets it run ok otherwise.
.I checked voltage with key on at each injector plug with all unplugged, one side was 11.21 one was 11.26, not sure if that falls into the normal category or not yet. The car also has had some performance issues (too damn slow in the 1/4 for what the car has), wondering if there is a a drop in voltage under WOT if I have something wired incorrectly that still lets it run ok otherwise.
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