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Old 11-10-2010, 04:47 PM
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Overboost?

Sometimes my truck will run differently at times and then after a few key turns it seems to go away. It seems like it's defueling or something and runs with less fuel. The check engine light has never come on. But I'm wondering if my truck is reading an overboost and not letting me get all the fuel I need. I'm thinking this because some days it will smoke a lot more than others under similar conditions. It also seems like I never get over 20-25 pounds, it kind makes a noise not like surge but more like the wastegate is actuating when I get up into the higher boost ranges and when my truck shifts under hard acceleration. I just put a hole new waste gate assembly on a while ago, just stock again. So maybe I just need to adjust the wastegate to hold the boost? Let me know what you guys think.
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Old 11-11-2010, 08:57 AM
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You may need a boost fooler..

There is no defuel on the Super Duty trucks regardless of boost amount. There is an overboost code that reduces the cycle time of the IPR. The result is a slower gain in acceleration, not a reduction of fuel. The way to see if you are setting this would be to scan for the code. This is off the top of my head and it may be wrong, but I think it is a P0236 that is the code. You can set them on 94-97's, but it is a higher differential than the 99-03's. I run a MAP Pressure Relief Valve on my 95.

However, I've seen various configurations of MAP sensor alterations and I would warn that most are ill conceived. The majority of the pressure relief set ups I've seen blow off actual boost and do not isolate excess boost to the MAP side only, leaving the manifold pressure able to rise. The electric modifications don't allow MDFR (Mass Desired Fuel Rate) on the low end early enough since they mitigate the overall boost by a percentage.
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Old 11-11-2010, 02:40 PM
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Wow that's a mouthful...

Um...so is there anywhere that will scan codes for free. Like NAPA or O'Reilly. Do they do that type of stuff? I know the dealerships charge for stupid stuff like that.. Maybe I'll start with scanning some codes. Then decode the last part that you said haha. I'm doing my best to learn everything, all in good time I suppose
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