ticking, low boost, high pitched air hiss - Ford Powerstroke Diesel Forum

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post #1 of 13 Old 01-21-2014, 04:12 PM Thread Starter
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ticking, low boost, high pitched air hiss

Nothing bit problems with both 7.3s I've owned. Getting a 6.0 next time... -_-

So got the truck running again, now I.noticed higher.rpm and building.boost I got a high.pitched.air.hiss, at 15psi, Max the motor.will reach.now..
Im. Pretty sure that's a.loose boot clamp,It got.stripped

Now I can only.make it to 10psi ish. At idle it sounds normal, but under throttle it starts ticking, louder and louder but not so much faster as the rpm goes up. So makes me believe its not a valve train part.
I'm thinking injectors? What else???
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post #2 of 13 Old 01-21-2014, 04:18 PM
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What oil do you use and how long since it was changed?



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
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post #3 of 13 Old 01-21-2014, 04:39 PM Thread Starter
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I changed.it in.September.with rotella. Then changed it.again.a couple.months ago.when all.my.oil blew out(loose bolts.holding the Turbo to the block when I did my exhaust).
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post #4 of 13 Old 01-21-2014, 06:11 PM
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buy or build a boost leak detector to find the problem.
there is atleast 10 different places it could be leaking from.

im hitting 35 with stock injectors

but ive been under the hood a lot fixing stuff and making sure i have no boost leaks

and 15 psi is about the highest a stock 7.3 will boost. you can try unplugging the red from the wastegate for a couple more.

99.5 f250 7.3 4x4 258k
PHP Phoenix, S&B CAI, 4" TBE, Hpx, Stancor, RR Billet Wheel, AIH Delete, Autometer Gauges, Leveling kit, Transgo kit, Warn Hubs, Int'l Up-Pipes, RR IC Boots, Non-Ebpv Pedestal, High Flow Outlet, RR OCR, 08 Tow Mirrors.

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post #5 of 13 Old 01-21-2014, 11:08 PM Thread Starter
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Nah I got 25psi at the most before this all happened. And I'm more concerned about the.ticking
Pretty sure the hiss is just the loose clamp. The ticking scares me.a bit. It suddenly started while driving down the road, now keeps doing it
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post #6 of 13 Old 01-22-2014, 01:08 AM
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are your up pipes leaking? if its not something motor related id say you have exhaust leak. that would explain the ticking.
a bent pushrod would be a pretty loud whump whump whump, and those rarely happen.

im guessing you never had to do head studs, or oil cooler, egr, injectors on a 6.0, any of those is more expensive than fixing practically anything on a 7.3.0

which clamp is leaking? the one on the CAC tubes or the clamps on the intake manifold.
if its the intake manifold you can get away with using regular clamps to hold those boots on.
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post #7 of 13 Old 01-22-2014, 05:18 AM Thread Starter
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Up pipes all the sudden though? I was driving and while going down the road, boom, started ticking, loudly. It doesn't get quicker with the rpm wither, just louder.

The clamp is the one on the drivers side of the intwrcooler on the boot to pipe connection
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post #8 of 13 Old 01-29-2014, 08:02 PM Thread Starter
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Its really as loud as it seems. I was wrong, it does increase with rpm, I had a lot on my mind and missed that before. So just a nasty rocker tick? If so would one be broken, cause it started doing it in a second, not gradually over its 195k mile life.
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post #9 of 13 Old 01-29-2014, 10:30 PM
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That sounds like an exhaust leak to me. Look for black soot around the manifolds.
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post #10 of 13 Old 01-29-2014, 10:35 PM
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ya i think so too.
just because lack of boost.

a bent pushrod would be much louder and rougher.
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