Sudden Boost Drop
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New User
Joined: Jan 2007
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Sudden Boost Drop
When I do a hard acceleration the truck downshifts and takes off with plenty of power like normal. But when I get to about 20 psi I loose all psi and power. A real bummer when I'm trying to pass somebody on the highway. It did this before a long time ago when I was running low on oil. Could oil foaming cause this or just a bad wastegate. I have about 13,000 miles on the current oil. I'm using a bypass system with amsoil 15-40 synthetic. My truck has a superchip, exhaust/intake mods. Any help please?
2000 7.3 PSD 96,000 miles
2000 7.3 PSD 96,000 miles
Of the next Riffraff East
Joined: Oct 2004
Posts: 8,679
Likes: 2
From: Concord NC
Foaming oil, low oil, dirty fuel filter, bad wastegate controller, and 13000 sounds like a lot but I am not that up to par on the bypass. At any rate, I would change it and see if that helps.
Postmaster
Joined: Sep 2006
Posts: 3,048
Likes: 1
welcome to FTE
well id say you have boost leak that opens up under load, or you have your truck defuel, cause you running to much boost, do you have any boost fooler? cause we know you running a chip, so under load your map sensor sees more than it was programmed for and defuel the truck , you loosing power, and it falls on its face.
well id say you have boost leak that opens up under load, or you have your truck defuel, cause you running to much boost, do you have any boost fooler? cause we know you running a chip, so under load your map sensor sees more than it was programmed for and defuel the truck , you loosing power, and it falls on its face.
Postmaster
Joined: Sep 2006
Posts: 3,048
Likes: 1
well than, what did you change since you start having problems with the boost?.
did you try to see if you can scan any codes from the truck? this might tell us more about the problem. but it has to be scanner for diesel trucks, and with ford package.
inspect your turbo for any wheel play in or out and phisical damage to compressor wheel, check you intercooler boots for damage and or loose ones.
did you try to see if you can scan any codes from the truck? this might tell us more about the problem. but it has to be scanner for diesel trucks, and with ford package.
inspect your turbo for any wheel play in or out and phisical damage to compressor wheel, check you intercooler boots for damage and or loose ones.
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Gone Fishin for Mark
Joined: Nov 2004
Posts: 1,354
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From: West of Houston
I just re-read the OP. Why do you need to down shift to pass? Sometimes I do, but not usually. That might be a restricted exhaust. Pay more attention to the RPM's/load than the boost next time it does it.
Last edited by joegebff; Jul 5, 2008 at 08:45 PM. Reason: re-read the OP.
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Thread Starter
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New User
Joined: Jan 2007
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I haven't done anything different lately. It just started happening. I had noticed I was a couple quarts low on oil and then topped it off prior to the problem. The truck is an automatic, so it downshifts automatically when I put my foot into it at 70 mph. Has anybody herd of this as a result of old oil or foaming?
Elder User
Joined: May 2008
Posts: 860
Likes: 2
From: Liberty Lake, WA
I haven't done anything different lately. It just started happening. I had noticed I was a couple quarts low on oil and then topped it off prior to the problem. The truck is an automatic, so it downshifts automatically when I put my foot into it at 70 mph. Has anybody herd of this as a result of old oil or foaming?
Laughing Gas
Joined: Mar 2004
Posts: 789
Likes: 16
From: West Coast/L.A. Area
I haven't done anything different lately. It just started happening. I had noticed I was a couple quarts low on oil and then topped it off prior to the problem. The truck is an automatic, so it downshifts automatically when I put my foot into it at 70 mph. Has anybody herd of this as a result of old oil or foaming?
Post Fiend
Joined: Jun 2006
Posts: 9,714
Likes: 2
From: White Mnt's,New Hampshire
I haven't done anything different lately. It just started happening. I had noticed I was a couple quarts low on oil and then topped it off prior to the problem. The truck is an automatic, so it downshifts automatically when I put my foot into it at 70 mph. Has anybody herd of this as a result of old oil or foaming?
What about Additives?
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New User
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I usually get up to about 25 psi under load without any problems. I have never lost boost before. I believe my super chip overrides the defuel issue. Yes my waste gate is connected. Now I have strong boost up to about 20 psi. When I'm hard accelerating it gets to about 20 and them immediately drops to 0 and I loose all power. When I back out of the throttle, boost and power returns in a few seconds. But a few seconds seen like eternity when your trying to pass someone in the oncoming lane.
Postmaster
Joined: Sep 2006
Posts: 3,048
Likes: 1
so your truck is defueling. you have to get your codes scanned and see if you have overboost code. you might have bad map sensor , if you have you friend with 99-2004 7.3 swap map sensor and see if it will help you . unless you scan codes we wont know for sure.