Originally Posted by Young-SC-Owner
EBP pressures will cause the Ecu to defuel if the pressures are high.
The ECU uses that value of manifold pressure to adjust fuel trim, and when to tell the ebpv to open when the throttle is depressed
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EBP isn't going to cause a massive powerloss though, i've driven my truck with many different EBP sensor issues and never noticed a power difference. Slight difference in shifting, but not in fueling.
To the OP, MAP sensor is located up on the cowl. There is a rubber line that runs from the passenger side intake plenum up to that sensor, this is where the PCM gets the boost reference from. If there is a leak in there somewhere, it will cause a massive power loss. AFAIK there is no way to really bench test a MAP sensor, but if you can get a scanner on it you can read the sensor and see what its doing.
EBPV closing can also cause a massive power loss, and you will be able to hear it. It makes a hissing noise, very distinctive. If its closing there are multiple ways around it, easiest one is to unplug the wires for it under the turbo.
And for the fuel pressure, i know you've got new stuff on the engine, but i'm wondering if the fuel lines or pickups couldn't be clogged up causing an issue.
And yes, it can throw "soft" codes without throwing a CEL. The 3 main ones i've seen on my truck are boost related codes, EBP related codes, KAM, and cam sensor codes, multitude of different codes in those 4 things. The turbo wheel sounds decent, thats not going to cause much of an issue with just a few little knicks.
97 F-250 ECLB 7.3/E4OD/4wd
, 216k miles: FFD 250/200%'s, stock turbo, built trans, e-fuel, Swamps IDM, shimmed 910's, Melling LPOP, welded cam gear/modified pick-up tube. Built and tuned by me
97 F-250 ECSB project truck:250/2's, Gen 3, S468, SD axles, studs/springs, ZF-6