Boost display drops to Zero... Why?
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5th Wheeling
Joined: Sep 2013
Posts: 49
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From: Plant City, FL
Boost display drops to Zero... Why?
On my monitor, when I really get on it, I see the boost come up nicely and then when it gets to about 22 -23 lbs, it drops to zero on my monitor display, but the engine does not seem to falter in anyway.
Does anybody know why or what I might do about it?
I find it very annoying and do not believe it should be doing so, thus figure it might be causing some other problems or so. ..? I hear others talking about seeing 24 and up boost being displayed... why not me?
Thoughts?
Does anybody know why or what I might do about it?
I find it very annoying and do not believe it should be doing so, thus figure it might be causing some other problems or so. ..? I hear others talking about seeing 24 and up boost being displayed... why not me?
Thoughts?
Postmaster
Joined: Jan 2005
Posts: 4,424
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From: BC Canada
Only an idea, but check MAP tube on pass side under hood, the MAP is attached at top of the firewall, tube goes down, check by taking off and seeing if you can plug one end, blow on other and if it holds pressure? Other thing I would look at is EBP sensor and tube? What do you read for MAP and EBP before start up, should be the same when in PSI. Then when started at idle? My bet is one of those tubes, blocked or cracked, and leaking?
If the above doesn't help, next I would clean EBP sensor, EGR valve, EBP tube, IAT1 and 2, MAF in side intake after air filter and then run relearn.
Then take above readings, IAT1 and 2 should read same before start. I am unsure if you have both on this year. IAT1 is beside MAF inside intake tube, iat2 intake runner passenger side behind oil and top fuel filter on top of engine.
If the above doesn't help, next I would clean EBP sensor, EGR valve, EBP tube, IAT1 and 2, MAF in side intake after air filter and then run relearn.
Then take above readings, IAT1 and 2 should read same before start. I am unsure if you have both on this year. IAT1 is beside MAF inside intake tube, iat2 intake runner passenger side behind oil and top fuel filter on top of engine.
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Joined: Aug 2001
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Try a different Boost PID in Dashboss. 1 Boost PID is fine tuned for lower boost psi, another is for High boost. You may even have a third Boost PID as well.
Beyond that, it's common for Dashboss to go to about 22 psi and then start over at 0. Although if you do a RECORD during that occurrence then resulting chart should show accurate boost up to peak.
Josh
Beyond that, it's common for Dashboss to go to about 22 psi and then start over at 0. Although if you do a RECORD during that occurrence then resulting chart should show accurate boost up to peak.
Josh
Lead Driver
Joined: Jul 2004
Posts: 6,951
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From: Foothills, CA
Try a different Boost PID in Dashboss. 1 Boost PID is fine tuned for lower boost psi, another is for High boost. You may even have a third Boost PID as well.
Beyond that, it's common for Dashboss to go to about 22 psi and then start over at 0. Although if you do a RECORD during that occurrence then resulting chart should show accurate boost up to peak.
Josh
Beyond that, it's common for Dashboss to go to about 22 psi and then start over at 0. Although if you do a RECORD during that occurrence then resulting chart should show accurate boost up to peak.
Josh
+3 on Josh's suggestion...
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Senior User
Joined: Dec 2014
Posts: 152
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From: South Carolina
This is from an older post. Under negative boost pressure. On the dashboss there is 3 separate selection I believe. One is map pressure and 2 are low and high boost. The low and high boost max at about 25# and show negative while the map pressure will show actual boost. I have a banks iq and they picked the boost pressure to show which does the same thing. They have a lot more money for r&d and I would have thought they would picked the pid that would show high boost but they didn't.
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This is from an older post. Under negative boost pressure. On the dashboss there is 3 separate selection I believe. One is map pressure and 2 are low and high boost. The low and high boost max at about 25# and show negative while the map pressure will show actual boost. I have a banks iq and they picked the boost pressure to show which does the same thing. They have a lot more money for r&d and I would have thought they would picked the pid that would show high boost but they didn't.
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No rhyme or reason why one shows boost to peak, another pegs out at 22 and for someone else is able to show to 25.
The Ecoboost and Hybrid cars have taken over programming, not much time anymore to correct 6.0 PIDs.
Josh
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