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Old 07-06-2012, 04:39 PM
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Power problems

Long story short, ice had my truck for almost a year and she's always had a check engine light but I never really cared much as she has always ran great, well I decided to fix the light and first two things I found were that I had an open from the map signal to ecu so I fixed that next I found I had an open from the ebp sensor and I fixed that, light still on so I did some testing and found out my map sensor was bad and so I replaced it with one from a 93 5.0 f150, engine light gone yay, but if I put my chip on the stock setting it is a freaking turd, will only make 10 psi of boost and has trouble going above 2500 rpms in gear, free revs great but a total slug, if I put it on any performance tune from the 50 all the way to the 140 it runs great, could it be that it's because it's from an f150 and not designed to see boost?
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Old 07-06-2012, 08:16 PM
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Are you getting calculated boost from the PCM (MAP minus BARO)?
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Old 07-06-2012, 08:57 PM
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I had the signal wire open to PCM so I fixed that and still had the check engine so I hooked the truck up to the modis scanner and it was stuck at 14psi reading and wouldnt change with pressure on the map, so I replaced the map with one from an f150 and the light went off, so I'm assuming that it is getting a reading now but I have no way to verify until Monday when I go back to work.
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