failing #8 contribution - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 11-23-2008, 05:41 PM Thread Starter
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failing #8 contribution

this a new 7.3 engine. compression test is fine in the cylinder. cylinder velocity shows 2.9-4.6 but the engine idles smoothe and no skips. I repalced the injector with another from ford and the cackle is down very much now but it still fails the contribution test. I still have hight readings in the cylinder velocity test. What gives?
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post #2 of 13 Old 11-23-2008, 06:16 PM
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How many miles have been put on the engine since the injector was replaced?


Although, I've seen number 8 failure for no good reason. Make sure the engine is hot. Run multiple tests. Try putting the drive in drive with the emergency brake on. This will put load on the motor.

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post #3 of 13 Old 11-23-2008, 06:27 PM Thread Starter
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i have put 300 miles so far since the injector change. Is it normal for the #8 injector to read this high of a percentage? i did the test again and it passed with the parking brake on in drive. Is it possible that the ford injector is faulty? It is a reman from them
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post #4 of 13 Old 11-23-2008, 06:46 PM
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My #8 was failing and I replaced it with a reman. Still fails the contribution test but it isn't shaking as much and not barely knocking at all.

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post #5 of 13 Old 11-23-2008, 07:00 PM
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What year is the truck? Depending on Calibration, #8 may need the infamous "long lead" injector. If there is a "cackle cure" calibration in the PCM, and a regular injector in #8, contribution will be off.

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post #6 of 13 Old 11-23-2008, 07:51 PM Thread Starter
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#8 has the long lead injector with the pmt1 computer
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post #7 of 13 Old 11-23-2008, 07:55 PM
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Seriously, engine runs smooth. No skips. Passes with load. Like I said before, some trucks will fail number 8 just to fail.


Stop looking for things to do or install a regulated return that will stop number 8 from starving for fuel.

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post #8 of 13 Old 11-23-2008, 08:04 PM Thread Starter
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LOL looks like you guys have led me in a good direction. I does seem that #8 will always be the lone wolf and will continue have a higher percentage . I can live with the slight knocking cackle. well at least its very low now since i changed the injector. Learning more each time i get on the forum
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post #9 of 13 Old 11-23-2008, 08:06 PM
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In all honesty, it's a dead head fuel system. Number 8 fires directly after number 6. the LL injector is a just a quick band aid fix. Invest in a regulated return.

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post #10 of 13 Old 11-23-2008, 08:26 PM Thread Starter
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Dirk. Which regulated return do you advise to use?
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