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  #1  
Old 04-19-2021, 01:06 PM
phill57 phill57 is offline
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Default Injector Flow Test 2015 GM Truck 5.3 L83 Glitch?

Hello

I was working on a 2015 GMC Sierra 5.3 L83 engine a couple weeks ago and was chasing a P219B code for fuel imbalance. I ran an Injector Flow test using my Verus Edge which at that time was running 20.4 software. The test results (see below) suggested all injectors on the right bank were flowing greater volumes than the left side. (greater pressure drop). After replacing all 8 injectors and carbon blasting the intake valves I got basically the same test results. I have since updated to 21.2 software and the test results are the same. I have tried running the same test on a 2016 and a 2017 which have no issues that I am aware of and got the same results. Bank 2 injectors consistently drop about 10psi greater than bank 1?

On another note since updating to 21.2 the test only shows cylinders 1 through 6 as the test is being run but actually appears to test all 8 cylinders.

The 1525 file is before replacement and the 1554 is after replacement and shows the missing cylinders 7 and 8 in the top left corner.

I have trouble believing the test results and was wondering if anyone has done the test using GDS2.
VIN on this 2015 was:3GTU2TEC0FG217472

Here is a video where the test starts at 19.54 min in:
https://youtu.be/53KDnvnIqF4
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File Type: jpg 20210401-1554-1.jpg (112.1 KB, 92 views)
File Type: jpg 20210412-1525-1.jpg (120.0 KB, 91 views)
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  #2  
Old 04-19-2021, 03:29 PM
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Thank You Phil, I will forward your report
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Old 04-20-2021, 08:01 AM
JBakke JBakke is offline
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Your submission has been added to our tracking system #168429
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Old 04-29-2021, 03:25 AM
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Default Glitch

I haven't run a fuel injection test in a long time but if I remember correctly, it is ran koeo .
I noticed you have a rpm pid in the tests you posted. Try the test with koeo and see if the results are different.
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Old 05-16-2021, 05:58 PM
phill57 phill57 is offline
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Default Injector flow test

As far as I know the injector flow test on the GDI systems is done while running. Not like the older port injection systems.
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Old 05-17-2021, 05:55 AM
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Yes it is done with vehicle running.Just my two cents,I wouldn't condemn a injector just based on this test.The AFIT is the accepted tool .
Also before ordering injectors for 14 and up TSB# 20-NA-098 should be read.
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Old 05-25-2021, 10:06 AM
JBakke JBakke is offline
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Our development team has reviewed your submission and has the following findings:

Only the the pressure drop values the controller returned are displayed. All cylinders are using the same conversion equation.


The current implementation is as designed and no changes have been made. Please let us know if there are any additional questions regarding this issue.
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Old 05-28-2021, 08:04 AM
zjeep zjeep is offline
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Every truck I have run this test gives same result. Different pressure from B1 and B2 , B1 is always lower pressure Even with NEW injectors. So how is this test useful ?
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Old 05-28-2021, 08:07 AM
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Also get same result with GDS2.
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Old 05-29-2021, 09:35 AM
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Despite this test being labelled as "injector flow test",it is just a injector balance test.The most usefull PID is RPM (drop).
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