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Bad Fuel Injector Symptoms

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Old 05-25-2007, 10:41 PM
JeremyH JeremyH is offline
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Bad Fuel Injector Symptoms

My dad has a 2000 F250 7.3L and he is thinking that he might be having trouble with his injectors. What are symptoms of bad injectors?

Can diesel injectors be pulled and cleaned just like gas engine injectors (pull and spray with carb cleaner)?

Thanks,

Jeremy
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Old 05-26-2007, 02:54 PM
JeremyH JeremyH is offline
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Bump.

Anyone?
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Old 05-26-2007, 03:30 PM
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You might take this to the dedicated 99-03 7.3L Diesel section, but injectors can be a failure point. I'd take a good look at the high pressure oil system, fuel pressure, fuel pickup in the tank, and make sure the filter is good before I'd suspect multiple injector failures. If you have access to someone with AE (AutoEnginuity), it can tell you volumes about what's going on...

EDIT: Forgot to mention -- when injectors fail, you can get oil in the fuel filter, so look for that, too.

Joe
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Old 05-26-2007, 03:34 PM
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What symptoms is he having? Rough running?
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Old 05-26-2007, 03:42 PM
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Alan's here -- you're in good hands...
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Old 05-26-2007, 04:52 PM
enominus enominus is offline
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with me on my 6.0 it was running very rough, sounded like my engine was about to jump out of the hood. and i had an extremely harsh vibration at a certain rpm, like a wheel was about to come off.
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Old 05-26-2007, 05:57 PM
JeremyH JeremyH is offline
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Rough idle with a slight vibration at the rear of the truck.

Also, upon deceleration, it hesitates slightly.
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Old 05-26-2007, 07:23 PM
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That does sound injector'ish but before committing to replacing one or more Ohm out the Under Valve Cover Harnesses. The 01's and earlier had an inferior connector on the inside and it can come loose.
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Old 05-26-2007, 07:48 PM
JeremyH JeremyH is offline
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OK. I'll let him know to check it.

For personal knowledge, can these injectors be easily pulled and cleaned? I have pulled and cleaned many injectors on gas engines, but those are a bit different due to the lower fuel pressure.
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Old 05-27-2007, 04:27 AM
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Moved to 7.3L section.
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Old 05-27-2007, 07:50 AM
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Not as easy to pull or clean. The HEUI system uses high pressure motor oil (~3000psi) ti drive the injector. Here is a little education on the injectors. http://www.intellidog.com/dieselmann/injector.htm

To check the harness ohm it at the Valve cover connector on the outside.

Pin Out

G G I I C I I G G

G=Glow Plug +
I = Injector +
C= Injector Common

***The injectors fire with a 115VDC signal from the IDM do not pierce to wires to test.***

Ohm between "I" and "C" to test the injectors, should be less than 5.0 Ohms

To check glow plugs Ohm between "G" and battery ground should be between 0.1 and 2.0 Ohms
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Old 05-27-2007, 10:30 AM
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As previously mentioned, the best thing to do is check it for codes and do a contribution and Buzz test, especially if the harness ohms out OK.
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Old 05-27-2007, 10:30 AM
John311t John311t is offline
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WHen the TC locks up into 4th gear, does the truck shake when giving it a little fuel, then if you mash the foot to the floor is kinda goes away and if you let up does it go away?
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Old 05-28-2007, 12:17 AM
JeremyH JeremyH is offline
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John,
not sure. He hasnt tried that...

Alan, thanks for all of the info! I passed it along to him....
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Old 02-11-2010, 06:06 PM
black smoke 350 black smoke 350 is offline
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this is what my 04 6.0 does what the hell is it bad injectors
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