7.3l injectors how do i test them IN truck? and find out when they were put in? - Diesel Forum - TheDieselStop.com
Power Strokes 1994-1997 General Technical discussion of topics related to vehicles powered by the Power Stroke engine in 1994 through 1997 models.

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post #1 of 4 (permalink) Old 10-18-2010, 12:17 AM Thread Starter
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7.3l injectors how do i test them IN truck? and find out when they were put in?

does ford date code injectors? so i know if they have been replaced since the truck was new in 97? and how do i tell if they are weak or bad ? my truck has 320k on it so far and everyone says time for new injectors just because it has 320k? is there a reason?
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post #2 of 4 (permalink) Old 10-18-2010, 01:39 AM
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If it ain't broke don't fix it. There is no date code on injectors although they do have serial numbers. As far as I know Ford does not record these numbers.
To check them in the truck you need a scanner that can perform a buzz test (electrical test) and a cylinder contribution test
If you aren't having issues with hard starting, smoking, or missing or sudden high oil consumption leave them be.
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post #3 of 4 (permalink) Old 10-18-2010, 09:12 AM
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You can't test an injector of any kind in a vehicle because what is tested is pop-off (for pressure-based injectors) and spray pattern (for all injectors.)

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post #4 of 4 (permalink) Old 10-19-2010, 02:38 AM
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I have to disagree somewhat with Drinkypoo. Pop off (nozzle opening pressures) and spray patterns are only part of the tests on modern injectors. A low nop or poorly operating injector CAN be picked up with a good scanner while in the engine. HEUI injectors used in Powerstrokes operate on oil pressure so NOPs can be calculated by monitoring ICP at idle. Nozzle opening pressure is also not as critical as some may believe.
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