Is this normal when pulling?
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Laughing Gas
Joined: Jan 2006
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From: Gig Em, Tx
Is this normal when pulling?
When I pull my trailer/s (from 5k +) and the truck goes from 3rd to od, there is a constant hissing sound from the engine and it will get louder if I accellerate and won't go away unless I get completely off the throttle. If I push the od button on the shift stalk I won't hear the hiss. If I really get on it the hiss will go to what I think is turbo stall. at 65 mph I will run around 5 psi boost and around 800 + on egt. With no load I don't hear the same hiss sound. Any ideas or is this normal?
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The hiss when loaded is your open element filter. Is the 5 lbs of boost when empty? If it's when loaded, then a lot of the hiss is probably a boost leak. If it's while empty, then it seems about ok.
As far as the pulling in OD, I vote for it's ok as long as it's not "hunting" for a lower gear and your Trans temps are good.
As far as the pulling in OD, I vote for it's ok as long as it's not "hunting" for a lower gear and your Trans temps are good.
Last edited by Orezona; Feb 20, 2007 at 09:01 PM.
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Laughing Gas
Joined: Jan 2006
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From: Gig Em, Tx
Originally Posted by Orezona
The hiss when loaded if your open element filter. Is the 5 lbs of boost when empty. If it's when loaded, then a lot of the hiss is probably a boost leak.
As far as the pulling in OD, I vote for it's ok as long as it's not "hunting" for a lower gear and your Trans temps are good.
As far as the pulling in OD, I vote for it's ok as long as it's not "hunting" for a lower gear and your Trans temps are good.
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Originally Posted by sgrol
5 lbs when pulling. I agree that pulling is ok in od. temp and shifting is flawless.
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From: Central, Al
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Posting Guru
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From: Central Alabama
Sounds like the AFE filter doing its work,to be on the safe-side do yourself a favor and double check all 6 of your intercooler boots for tightness ans cleanliness. Towing in OD is fine unless your tranny consistanly hunts for 3rd. Towing constantly in 3rd will raise tranny temps, unless you have an auxilery tranny cooler to keep them in check.
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Laughing Gas
Joined: Jan 2006
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From: Gig Em, Tx
Originally Posted by amiller93
Exhaust backpressure valve isn't sticking closed is it? 800* at 5psi seems kinda high
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Laughing Gas
Joined: Jan 2006
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From: Gig Em, Tx
Originally Posted by strokin_it7.3
What is the maximum boost that you see under high load conditions?
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From: 21791
www.dieselsite.com has the great boot kit that will sustain the CCV without having the oil leak out or boots popping off.
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WhiteBuffalo the other day gave a NAPA part # for Marine Grade tubing that he says works great for what we need. I can't remember the thread. But search his name and send him a PM. I think he said he got the idea from that big name performance shop where he lives.
EDIT: Here is a picture from his Gallery of the stuff. Looks like it is Marine Exhaust Boot material.
EDIT: Here is a picture from his Gallery of the stuff. Looks like it is Marine Exhaust Boot material.
Last edited by Orezona; Feb 20, 2007 at 09:34 PM.
Post Fiend
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From: Central, Al
1. How cold is it there sgrol?
2. DTC P1249 indicates that the PCM detected the turbo was overboosting which is not possible if you are seeing 12 psi max
3. 12-15 psi backpressure at 65 seems kinda low
2. DTC P1249 indicates that the PCM detected the turbo was overboosting which is not possible if you are seeing 12 psi max
3. 12-15 psi backpressure at 65 seems kinda low
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Laughing Gas
Joined: Jan 2006
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From: Gig Em, Tx
Originally Posted by amiller93
1. How cold is it there sgrol?
2. DTC P1249 indicates that the PCM detected the turbo was overboosting which is not possible if you are seeing 12 psi max
3. 12-15 psi backpressure at 65 seems kinda low
2. DTC P1249 indicates that the PCM detected the turbo was overboosting which is not possible if you are seeing 12 psi max
3. 12-15 psi backpressure at 65 seems kinda low