Cylinder 8 contribution fail? - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 04-14-2013, 09:44 AM Thread Starter
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Cylinder 8 contribution fail?

what does it mean when you have code p0284 cylinder 8 contibution?

2000 f250 single cab long bed, 7.3, rebuilt stock turbo, XDP fuel regulator, injector harness mod, 17 inch pro comp extreme wheels, 33 inch dynapro tires, 5 inch mbrp exhaust, autometer boost gauge
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post #2 of 6 Old 04-14-2013, 11:08 PM
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It is very common. The firing order is 1-2-7-3-4-5-6 -8. Since 8 fires right after 6 #8 may not get enough fuel. That is why Ford started using the long lead injector in #8. Some even fail on #3 and #8. I wouldn't worry about it unless you are having symptoms of a bad injector.

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post #3 of 6 Old 04-15-2013, 05:41 PM Thread Starter
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well I am having a very low boost issue and its starting to look like injectors are bad. If one injector is bad would it contribute to only building 10 psi of boost?

2000 f250 single cab long bed, 7.3, rebuilt stock turbo, XDP fuel regulator, injector harness mod, 17 inch pro comp extreme wheels, 33 inch dynapro tires, 5 inch mbrp exhaust, autometer boost gauge
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post #4 of 6 Old 04-15-2013, 05:43 PM
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Quote:
Originally Posted by dieselyoungster114 View Post
well I am having a very low boost issue and its starting to look like injectors are bad. If one injector is bad would it contribute to only building 10 psi of boost?

No. Something is wrong with your turbo system. Boost leaks, exh leaks, turbo itself...


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post #5 of 6 Old 09-12-2013, 06:58 PM
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Not to hijack, but this seems somewhat related. Would a P0284 code have any correlation to white smoke coming from the exhaust when accelerating? (not when starting or when cold, just accelerating)

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post #6 of 6 Old 09-13-2013, 08:17 AM
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check the firewall for carbon build up where the up pipes are connected, there is a doughnut type seal that is known to fail and this will lower boost numbers. Check for play in the turbo wheel. Also make sure the boots in the IC plumbing are in good shape and the clamps are good n tight.

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