Rpm drop during braking - Ford Powerstroke Diesel Forum
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Old 03-24-2014, 10:12 AM
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Rpm drop during braking

This problem haunts me every night when i go to sleep and i gotta figure out what this is.
Here's the symptoms i'm getting:
i'm going down a hill and using the engine to brake. I push in the clutch and then push on the brake and the RPM of the engine drops to about 475 and then goes back to 650.

I'm running an SCT tuner and have tried changing tunes and have not noticed a significant difference. I have a FASS 125 gph pump. Tried replacing ICP sensor. Only engine codes are AIH delete code and EBPV diconnected code. New 6637 air filter. new fuel filters. Pickup in tank has been replaced with aftermarket pickup. No fuel leaks I can find. The only thing that i have found that could be a source of the problem is the EBPV rod is leaking oil (on my to-do list). The truck runs absolutely perfect except for this weird idle thing.

I don't have access to an Auto Engenuity to test the HPOP, but i'm thinking of just rebuilding the IPR valve just to see if this might help. Could it be injector O-rings? what are the symptoms of needing them? weak HPOP?
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