99 7.3 lack o' power and herky jerky - Ford Powerstroke Diesel Forum
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Old 08-13-2010, 04:52 PM
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99 7.3 lack o' power and herky jerky

I bought my 99 6 spd long box extended cab duelly F350 7.3 (Late99) a few months ago and have had a bumpy ride so far. I found that it lacked power towing my 763 Bobcat, so bad that I would drop up to 20 MPH up a long incline. My buddy has a scan tool and we found that injector pressure was dropping under a load and a fault turned up in the 3 and 8 cylinders so I replaced the injector O-rings and while doing so, I found that the injector for the #8 cylinder was badly corroded and burned, I bought a reman and put it in, while doing so, I also noticed fuel leak coming from the fuel supply to the left front head, replaced the gasket/oring and the truck ran great for a couple weeks, plenty of juice and I was satisfied until it started jerking pretty bad at about 1500 RPM. It idles smooth and seems to act up much worse when it is cold. It is also very intermittent, I did run the scanner on it again after the work and Injector oil pressure got up around 2500 PSI at WOT, which made me smile, but it still showed cylinder faults on 3 and 8. Any help you could give a rookie would be much appreciated, I am looking hard at replacing the IPR valve/HPOP, any other ideas before I start blindly throwing parts at this?
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Old 08-13-2010, 05:18 PM
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You might have a cam position sensor problem. The #3 and 8 faults might need to be eraced from before. Maby
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Old 08-13-2010, 05:43 PM
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Having injector faults for #3 and #8 while doing a contribution test is usually a by product of having a grey cps sensor.
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Old 08-14-2010, 06:59 AM
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THanks for the tip, I will look into the CPS, I read there was a recall on the grey ones. I also heard Ford offers a OEM replacement for 20 bucks. How long would a fault code stay up after it is resolved?
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Old 08-14-2010, 12:27 PM
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yep grey cps sensor. seems like that did the trick!
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