Is this normal when pulling?
Post Fiend
Joined: Jul 2005
Posts: 14,582
Likes: 12
From: 21791
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
Could this mean a faulty MAP sensor?
Post Fiend
Joined: Jun 2006
Posts: 5,497
Likes: 7
From: Central, Al
could be MAP or a shorted wire OR BARO could be flakey which means PCM problems.
The one that jumps out most is the backpressure that low at that speed usually means a clogged tube and that would allow the PCM to close the EBPV all the time if the temps are <45*
BTW: are you trying to tell us you got a girlfriend..LOL
The one that jumps out most is the backpressure that low at that speed usually means a clogged tube and that would allow the PCM to close the EBPV all the time if the temps are <45*
BTW: are you trying to tell us you got a girlfriend..LOL
Postmaster
Joined: Jun 2006
Posts: 2,647
Likes: 0
From: Fulltime RVer
Originally Posted by amiller93
BTW: are you trying to tell us you got a girlfriend..LOL
Freshman User
Joined: Dec 2006
Posts: 28
Likes: 0
From: Wyoming is my home
Kind of Low PSI
I just got done with a long trip pulling my 36 foot gooseneck trailer and I never run 5 psi. I was always running 15 to 27 psi. I also have a AFE intake and I always hear turbo whine not hissing. Sounds like you might have a boost leak somewhere. How old is your truck and how many miles do you have on it
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Laughing Gas
Joined: Jan 2006
Posts: 1,045
Likes: 5
From: Gig Em, Tx
Originally Posted by Fire Rooster
I used to get this with my stock turbo and it is turbo lag. let the truck down shift and then gain some speed. the hissing will go away
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Laughing Gas
Joined: Jan 2006
Posts: 1,045
Likes: 5
From: Gig Em, Tx
Originally Posted by 450power
I just got done with a long trip pulling my 36 foot gooseneck trailer and I never run 5 psi. I was always running 15 to 27 psi. I also have a AFE intake and I always hear turbo whine not hissing. Sounds like you might have a boost leak somewhere. How old is your truck and how many miles do you have on it
Elder User
Joined: Feb 2003
Posts: 673
Likes: 0
From: Virginia
i just bought this
from diesel site and located a boost leak on my wifes 01 f250. The sounds you are describing were similar to the ones i was hearing in her truck. Look for a leak (mine was going from the "y" to the drivers side intake manifold, at least the largest leak ive found so far was there)
from diesel site and located a boost leak on my wifes 01 f250. The sounds you are describing were similar to the ones i was hearing in her truck. Look for a leak (mine was going from the "y" to the drivers side intake manifold, at least the largest leak ive found so far was there)
Junior User
Joined: Aug 2006
Posts: 50
Likes: 0
From: Yadkinville, NC
I have an 02 with 89000 on it and it does this, but I never heard it or payed it any attention to it when I bought it, now with the 6637 I hear it, mine may be just because of the filter? I know when it changes gears it will continue to hisss until I let off the gas or when the engine seems to catch up to the mph, towing or not it does this. I have cleaned the boots that go to the intercooler pipes and rechecked all clamps I'm clueless if it's supposed to do this or If there is a leak.
Elder User
Joined: Apr 2005
Posts: 533
Likes: 0
From: Simpsonville, SC
Originally Posted by sgrol
about 8 psi when accelerating at speed (65). If I am out of od the boost will go up to 12.
After the fix my engine got a lot quieter (less hissing). Now I have noisy tires to deal with that I didn't "hear" as much as before... (I think I have a wear problem).
