Low Boost Question - 25 rather than 29
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More Turbo
Joined: Aug 2006
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Low Boost Question - 25 rather than 29
2007 6.0 60k.
During harvest I noticed the boost pressure gauge would max WFO at roughly 25-26 rather than roughly 29. I checked the air restriction indicator because the truck has been in the fields and on gravel. Gauge indicated nothing.
I was paranoid about the accuracy of the filter indicator because it has never moved and I have never replaced the filter. So I replaced the filter. Some dust packed into the old filter, but the new filter did nothing to change performance.
Swapped fuel filters before schedule. Same performance issue.
On shutdown the turbo sounds the same as always- so my hope is that the unit is ok.
No misses. No smoke. No "check engine" - everything is perfect but it feels low on power.
Local friendly Ford dealer tells me that 25 is normal and 29 is over boost. So I am not getting any help from him.
The truck now pulls like a stock Cummins- which is not why I purchased the 6.0.
Ideas?
Thanks- Mike
During harvest I noticed the boost pressure gauge would max WFO at roughly 25-26 rather than roughly 29. I checked the air restriction indicator because the truck has been in the fields and on gravel. Gauge indicated nothing.
I was paranoid about the accuracy of the filter indicator because it has never moved and I have never replaced the filter. So I replaced the filter. Some dust packed into the old filter, but the new filter did nothing to change performance.
Swapped fuel filters before schedule. Same performance issue.
On shutdown the turbo sounds the same as always- so my hope is that the unit is ok.
No misses. No smoke. No "check engine" - everything is perfect but it feels low on power.
Local friendly Ford dealer tells me that 25 is normal and 29 is over boost. So I am not getting any help from him.
The truck now pulls like a stock Cummins- which is not why I purchased the 6.0.
Ideas?
Thanks- Mike
Last edited by IHbase; Aug 30, 2010 at 02:05 PM. Reason: typo
Senior User
Joined: Aug 2010
Posts: 202
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From: FLORIDA
2007 6.0 60k.
During harvest I noticed the boost pressure gauge would max WFO at roughly 25-26 rather than roughly 29. I checked the air restriction indicator because the truck has been in the fields and on gravel. Gauge indicated nothing.
I was paranoid about the accuracy of the filter indicator because it has never moved and I have never replaced the filter. So I replaced the filter. Some dust packed into the old filter, but the new filter did nothing to change performance.
Swapped fuel filters before schedule. Same performance issue.
On shutdown the turbo sounds the same as always- so my hope is that the unit is ok.
No misses. No smoke. No "check engine" - everything is perfect but it feels low on power.
Local friendly Ford dealer tells me that 25 is normal and 29 is over boost. So I am not getting any help from him.
The truck now pulls like a stock Cummins- which is not why I purchased the 6.0.
Ideas?
Thanks- Mike
During harvest I noticed the boost pressure gauge would max WFO at roughly 25-26 rather than roughly 29. I checked the air restriction indicator because the truck has been in the fields and on gravel. Gauge indicated nothing.
I was paranoid about the accuracy of the filter indicator because it has never moved and I have never replaced the filter. So I replaced the filter. Some dust packed into the old filter, but the new filter did nothing to change performance.
Swapped fuel filters before schedule. Same performance issue.
On shutdown the turbo sounds the same as always- so my hope is that the unit is ok.
No misses. No smoke. No "check engine" - everything is perfect but it feels low on power.
Local friendly Ford dealer tells me that 25 is normal and 29 is over boost. So I am not getting any help from him.
The truck now pulls like a stock Cummins- which is not why I purchased the 6.0.
Ideas?
Thanks- Mike
Just a thought you don't have a leak in one of your turbo pipes
all it takes is a pin hole.
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More Turbo
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I went over the hoses connecting the pipes to the turbocharger and the intercooler. I found some small cracks in one of the blue hoses- nothing that appears to be all the way through, but still troublesome. My hunch would be that if there were a leak, I would see some oil discoloration around the hole similar to the light film that appears around the joints.
I'll check the pipes and intercooler again more carefully once everything dries off.
Anyone have any ideas about whether or not Ford will warranty the blue hoses for light cracking?
-mike
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Joined: Dec 2003
Posts: 15,368
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From: Stuttgart, Ar
No warranty for the "light cracking". It would have to have a hole. Hard to make a case of 25 vs. 29 with the dealer but he's right. I know you replaced your fuel filters but check the fuel pressure if you can. It should be a minimum of 45psi at WOT. Sometimes air leaks can be hard to find. Smoke test would be best case scenario.
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Joined: Jun 2005
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From: Las Vegas
My 07' would hit 29psi from day one, a few months ago I took it in for a slight mis and they replaced some injectors and now my boost gauge peaks at about 25psi. Can they reduce the boost by updating the trucks computer?
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More Turbo
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No warranty for the "light cracking". It would have to have a hole. Hard to make a case of 25 vs. 29 with the dealer but he's right. I know you replaced your fuel filters but check the fuel pressure if you can. It should be a minimum of 45psi at WOT. Sometimes air leaks can be hard to find. Smoke test would be best case scenario.
-mike
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Hotshot
Joined: Aug 2006
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From: Whittier, CA
Can't say why it feels puny, but 25 is a good boost level. Has it been to the dealer lately for any work?
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Joined: Jul 2005
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From: Middle Tn.
The boost you are seeing is normal. Does not look like a leak to me. I'm surprised you ever saw 29 on an '07. But they may have flashed your truck to the latest strat and that's all you will see for boost.
He is correct.
Can't say why it feels puny, but 25 is a good boost level. Has it been to the dealer lately for any work?
He is correct.
Can't say why it feels puny, but 25 is a good boost level. Has it been to the dealer lately for any work?
Post Fiend
Joined: Oct 2009
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From: N. Fort Worth, tx
you sent me an email wich I got. however you have it set up so you can not recive them.
IMO the dealer is right 25 is good and 29 is over. now with that said. you have should check a few things.
check for exhaust leaks arounf the firewall and at the y-pipe
check ficm voltage
check egr valve and make sure its not hung open at all. Basicly pull the valveout and make sure you can see no light between the valve and were it seats in the body of it.
as stated check fuel pressure.
IMO the dealer is right 25 is good and 29 is over. now with that said. you have should check a few things.
check for exhaust leaks arounf the firewall and at the y-pipe
check ficm voltage
check egr valve and make sure its not hung open at all. Basicly pull the valveout and make sure you can see no light between the valve and were it seats in the body of it.
as stated check fuel pressure.
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More Turbo
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Good idea but no- I have avoided the dealer since watching one of their guys repeatedly stall the truck in front of the waiting room. Yes, he thought 3rd was 1st. Repeatedly. And because the trucks runs (ran) so well, I didn't want to risk a new flash.
The short of the long, the change in boost pressure can not be attributed to a new flash.
Thanks for weighing in.
-mike
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True- the boost gauge like the oil pressure and the temp gauge have been so heavily weighted by Ford to be almost useless. And the markings are a bit of a joke. But that said, the gauge was reading what appeared to be around 29 WFO since after initial break-in until very recently. And now it tops out at what appears to be 26. You are correct, it is a crap gauge for accuracy. But I am not saying that was actually 29 or is actually 26. I am just saying that it dropped a significant amount (15%) and the truck doesn't take off once the tach swings past 2300 as it used to.
-mike
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More Turbo
Joined: Aug 2006
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thanks
you sent me an email wich I got. however you have it set up so you can not recive them.
IMO the dealer is right 25 is good and 29 is over. now with that said. you have should check a few things.
check for exhaust leaks arounf the firewall and at the y-pipe
check ficm voltage
check egr valve and make sure its not hung open at all. Basicly pull the valveout and make sure you can see no light between the valve and were it seats in the body of it.
as stated check fuel pressure.
IMO the dealer is right 25 is good and 29 is over. now with that said. you have should check a few things.
check for exhaust leaks arounf the firewall and at the y-pipe
check ficm voltage
check egr valve and make sure its not hung open at all. Basicly pull the valveout and make sure you can see no light between the valve and were it seats in the body of it.
as stated check fuel pressure.
(The forklift weights 23,000 and the trailer weighs 8,900...) I will go through each suggestion in order.
Thank you again for taking the time to reply.
-mike
ps: I have been around trucks that ran rough or missed that we "fixed" by loading up and running hard (below max RPM but wide open throttle) for an extended period (5-15 minutes). My uninformed-redneck-theory is that high heat and temperature are good for cleaning up (well-maintained) motors that have not been worked properly (heads, valves, injectors, turbochargers, etc). Will a good load at 2500-2700 RPMs (100% load) do anything to clean up EGR-related issues on a 6.0 or do you always have to open them up in order to address the issue?
-mike
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More Turbo
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-mike