How do you test fuel injectors? - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 02-09-2011, 05:41 PM   #1 (permalink)
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How do you test fuel injectors?

I have a 2000 Ford F350 with 7.3 engine, stock. It is very hard to start, seems to crank at half the speed of another 7.3, It has to have block heater plugged in and then must crank on it for a long time, more than once, when it does start must hold pedal off idle, sounds like it has a miss, after a while it will smooth out, but has a sound like open valve coming from air box.
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Old 02-09-2011, 06:22 PM   #2 (permalink)
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In the truck, you can test them by doing a cylinder contribution test, a buzz test, or by watching the %deceleration (PERDEL) with a scanner. You could also observe the oil flow from individual injectors while the engine is running. Out of the truck, there are injector shops that can bench test them.

However - injectors won't cause a change in cranking speed. That sounds more like batteries and/or starter issues. Also, the miss could be from one or more bad glow plugs.
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Old 02-09-2011, 06:46 PM   #3 (permalink)
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for the cranking problem it could be- one battery is junk, both are weak, parallel battery cable has a loose terminal (pulling from only one), starter issues. how cold is the truck on startup
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Old 02-10-2011, 09:22 AM   #4 (permalink)
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installed new glow plugs and relay.
thanks
Dan
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Old 02-10-2011, 09:23 AM   #5 (permalink)
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temp has been in the low 50's down to low 30's.
Thanks
Dan
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Old 02-10-2011, 09:38 AM   #6 (permalink)
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replaced both batteries, charged to 14.4 volts, cleaned battery connections, checked battery cables on each side of connections for corosion, found none. replaced all glow plugs and relay. even with the block heater plugged in, it will not start now. It sounds like it wants to but will not seem to hit no all cyl, only a couple.
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Old 02-10-2011, 10:27 AM   #7 (permalink)
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Where are you at? Someone might have AE close by.
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Old 02-11-2011, 08:25 AM   #8 (permalink)
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Do you have any oil leaks from the HPOP fittings?
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Old 02-11-2011, 09:47 AM   #9 (permalink)
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I am near susanville, ca. Doyle, CA. No oil leaks, oil level is up in hpop. Is it possble that the engine cranking speed is to slow to develope the pressure required for the injectors ?
Thanks
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Old 02-11-2011, 10:02 AM   #10 (permalink)
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Yes - even with good batteries, a bad starter may not be able to get the 100 RPM minimum the truck needs to start.
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Old 02-11-2011, 10:03 AM   #11 (permalink)
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Have you replaced the starter? I had a OEM starter that was starting to crap out and would barely turn the engine over during cold weather....I upgraded to a DB high torque starter and HUGE difference in cranking time. You could have the best batteries in the world, but if the starter is crappin out on you, you're gonna be hard pressed to turn the engine over.
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Old 02-11-2011, 11:44 AM   #12 (permalink)
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I would take the starter off and take it and have it tested . Then I know this sucks specially if you have everything back on the motor but you need to test your UVCH and Valve cover gaskets to make sure you are getting a good connection . You may have a easy fix that just requires a little time and effort to pin point it . THis is if the starter checks out fine . None of these cost money to check just time .
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