injector flow testing - Ford Powerstroke Diesel Forum
 
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post #1 of 10 Old 04-05-2013, 07:33 AM Thread Starter
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injector flow testing

what happens if some of the injectors don't flow the same? my 02 7.3 has a kinda choppy shudder feeling around 40 mph. i have new injectors in and didn't know what the symptoms are if the set isn't matched right. what would the truck run like if they weren't? thanks
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post #2 of 10 Old 04-07-2013, 06:19 PM Thread Starter
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i notice it more when truck is up to temp and not when its cold
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post #3 of 10 Old 04-11-2013, 03:33 PM
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Where did you buy the injectors or have them rebuilt? If it was Pensicola diesel then send them back. I have had nothing but problems with their products. They do not flow test their injectors and they are junk. Just do a search on them and you will see the complaints about them. If they are not flow tested then you will not get a good power balance from each cylinder. Also, you could have one that over fuels and you will never see it on you EGT gauge especially if you have your pyro in only one bank of the engine (like most do). This isn't a problem if your supplier or rebuilder flow tests the injectors (like Rosewood Diesel). You could have an injector that is dumping fuel in a cylinder and end up buring a hole in a piston. If there was a large imbalance then you might feel it, but chances are that you would never know.

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99.5 F-250 4x4, 7.3 PS
Engine:
State 1 injectors from Rosewood, GT38 (van) turbo, S&B intake, Comp Cam's 910 valve springs, Smith Brothers pushrods, AIH delete TS 6-position chip. Pyro.

Body:
2005 front end conversion, 2008 tailgate, taillights, and rear bumper.

Future Mods:
Edge CTS monitor, and 4" Exhaust (Manufacturer to be determined).
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post #4 of 10 Old 04-12-2013, 06:28 PM Thread Starter
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i got them from full force... its just in the 35-45 range it seems sluggish and truck shakes a little nothing horrible feel it in the wheel and a good vibration in the pedal in the 1300-1600 range. after it downshifts to 3rd or 4th whatevers in the 38mph range..drove it hard to chicago and when i came back i got a high exhaust presser code but i don't think that would cause it. should i do a cylinder balance test? contribution and buzz test pass fine
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post #5 of 10 Old 04-13-2013, 01:33 PM
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A shutter felt in the wheel and in the pedal would make me think drivetrain. There is no link between the pedal and the engine other than a few wires going to the PCM. I know that doesnt explain the sluggish feeling that you are feeling, but I think you may have something going in your front end that is why you are feeling it in your steering wheel. I went to Full Force's website and nothing states that they flow test their remans. I see that you can have them flow test injectors for $250 I do believe, but that doesn't mean that they flow test their remans. Any test is going to give you information and information is key. Is your truck a 4x4?

[SIGPIC]

99.5 F-250 4x4, 7.3 PS
Engine:
State 1 injectors from Rosewood, GT38 (van) turbo, S&B intake, Comp Cam's 910 valve springs, Smith Brothers pushrods, AIH delete TS 6-position chip. Pyro.

Body:
2005 front end conversion, 2008 tailgate, taillights, and rear bumper.

Future Mods:
Edge CTS monitor, and 4" Exhaust (Manufacturer to be determined).
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post #6 of 10 Old 04-14-2013, 08:43 PM Thread Starter
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yes truck is a 4x4 i think its motor related because soon as i let up off the throttle it goes away and then when i get on it again there it is again. could a injector or 2 be off and flowing different by chance? what would that cause if it was?
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post #7 of 10 Old 05-03-2013, 02:22 PM
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What year is your truck? The 99's have had trouble with their factory torque converters. If I were a betting man, and I am, I would say it's your torque converter. This would explain the shutter, and the sluggishness that you are refering to.

[SIGPIC]

99.5 F-250 4x4, 7.3 PS
Engine:
State 1 injectors from Rosewood, GT38 (van) turbo, S&B intake, Comp Cam's 910 valve springs, Smith Brothers pushrods, AIH delete TS 6-position chip. Pyro.

Body:
2005 front end conversion, 2008 tailgate, taillights, and rear bumper.

Future Mods:
Edge CTS monitor, and 4" Exhaust (Manufacturer to be determined).
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post #8 of 10 Old 05-05-2013, 01:39 PM Thread Starter
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mines an 01. is there any way i could check without having to take it apart. i don't know a lot about trannys and torque converters
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post #9 of 10 Old 05-05-2013, 03:25 PM
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X2 on tcc shudder
Try dr tranny shudder fix have had luck eith that on fords
Also if its tcc use the brake switch to disengage it as you pasd through that speed range.
If it goes away we found it.
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post #10 of 10 Old 05-06-2013, 01:06 PM Thread Starter
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i tried shudder fix a few months ago and didn't really notice a change.. so to do the other test.. i basically should ride the break a little as it passes through the range where i notice my problem? thanks for the help
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