wierd sound - Ford Powerstroke Diesel Forum
 
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post #1 of 4 Old 02-29-2012, 09:32 PM Thread Starter
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wierd sound

hi guys i bought a early 99 7.3 and it is awesome ! it does make an odd sound tho that concerns me untill it is very warm . I worded that carfully because it makes this shhh shhhh shhh sound intill you drive it for about 15 -20 min and is most notisable wile under very light throttle. while it makes this sound my rpm also drops by a couple rpm . it starts and idles fine. when idleing if you hold the rpms up to like 1700 rpm after a second or two the motor will make this hissing sound and the rpms will drop by like 300-400 rpm .if your driving slow while it does this you can literaly feel this hesitation untill it goes away . under lots of power or load it runs awesome and after a very good warm up it does'nt do this any more and runs fine . I dont know anything about these trucks but i was wondering if it has somthing to do with the turbo or waste gate ?
thanks for any help.
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post #2 of 4 Old 03-01-2012, 04:19 AM
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Search EBPV. Its normal.

Nonconformist. Functionality over bling.

My three rules for 7.3l troubleshooting: 1) Replace CPS and keep a spare. 2) Replace FPR and know your fuel pressure. 3) Hook it to a scanner and check for codes.
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post #3 of 4 Old 03-02-2012, 04:55 AM Thread Starter
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thanks audiocontr

i unpluged that noisy thing . maybe ill do the the jake thing later but for now is way better. thanks again
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post #4 of 4 Old 03-02-2012, 05:00 AM
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yep what they said bud! look back on the turbo and you will see 2 wires going to it. just unplug it and no more sound!

Trevor
NEW MOTOR BEING BUILT! motor thats in it right now....7.3,DI stage 4s 350/200s, GT4594 turbo, ZF5 swap, Valair Kevlar clutch, term twins HPOP, 6" lift, 35",Banks IC, DIY 6637 filter, 3.5" down pipe, BDP IDM, TW live tuned chip, BD turbo timer, DIY ladder bars,910 springs, push rods, studs, fuel and airdog I.
SOLD 99 F350 CCLB 6speed 4in down pipe. and banks junk, made 330 on the dyno at 5k feet though. 2.5in leveling kit. custom bumper.
1983 F250 6.9 IDI, 4X4, Flat bed
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