railer Posted February 24, 2016 Report Share Posted February 24, 2016 when at start up warming up the motor you hear a hiss out of the exhaust on off on off ,and at the bottom of the turbo there is a rod moving back and forth making that hiss not the top one . after its all warmed up it stops , my other 7.3 doesn't do that ,now you can drive it and you can feel that on -off on off feeling till it warms up ,,any thoughts ? Link to comment Share on other sites More sharing options...
Ford27 Posted February 24, 2016 Report Share Posted February 24, 2016 My guess is the EBPV... (exhaust Backflow pressure valve) I'm pretty sure you can just unplug it and see if it goes away. It will take a lot longer to warm up tho Link to comment Share on other sites More sharing options...
railer Posted February 24, 2016 Author Report Share Posted February 24, 2016 thank you very much ill try that Link to comment Share on other sites More sharing options...
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