Knocking, possible #8? - Ford Powerstroke Diesel Forum
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Old 03-27-2012, 09:02 PM
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Knocking, possible #8?

A few months ago, I had my truck scanned with the Ford Rotunda software. #8 cylinder came up on the computer but I didn't notice the truck running any different. Just recently, (250 miles ago) I decided to try the 100 performance setting on my chip for a whole tank to see what kind of mileage I would get. I've dogged the truck a few times between now and then and since i've had it on the 100 perf setting but I drive it as if it were in stock setting most of the time. Tonight when I pulled up to my house, I noticed what sounded like a knock. I left the truck running, popped the hood, and I could hear a knock coming from the passenger side towards the back of the engine. My question is, can I just throw an injector in, or is #8 cyl toast and the whole engine need a rebuild?

Truck is in sig, 117k miles. If you need more info, let me know.
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Old 03-28-2012, 12:59 PM
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Guess i'm a noob, I assumed #8 was up against the firewall on the passenger but it's not. Now i'm wondering which one it is!
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Old 03-28-2012, 01:06 PM
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Passenger side is 1-7. It could be a few things but pulling the valve cover and pulling the plug on each injector may help you track down the problem.
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Old 03-28-2012, 06:44 PM
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Toms01PSD- I can't wait to hear the answer, I've got an 01 and notice the same thing intermittently.
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Old 03-28-2012, 07:23 PM
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Where are you located?
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Old 03-28-2012, 07:34 PM
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South Georgia
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Old 03-28-2012, 08:14 PM
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If you were closer I would say we could compare. How many miles on your truck?
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Old 03-30-2012, 05:25 PM
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I have a sticking injector. Started it today and it idled like it had a big cam in it. Started accelerating out of my driveway and it vibrated and ran rough. Now to figure out which one(s) are messed up!
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Old 03-31-2012, 09:44 PM
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Threw a 'Service Engine Soon' light today also. Would injectors do that?
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Old 04-08-2012, 03:39 PM
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i worked on a 97 that had a similar problem, it would knock like crazy from the #7, and eventually wouldnt start or would be really hard to start and would run terribble, threw me some codes that just didnt really add up to an injector, but i replaced it anyway and it didnt do anything. after a little more work it turned out to be a fuel pump that went bad, so before dropping money on an injector i would check to make sure your fuel pump is good.
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