no turbo
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New User
Joined: Dec 2001
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From: Bentonville U.S.
no turbo
I have a 96 f-350 that doesn't pull as well as I think it should, a while back I was pulling a trailer with a small load on it and as the people behind me road my butt my patience ran out. 
I mashed the gas and picked up some speed, but the next time I used the truck I noticed that I couldn't heard the turbo "at all". I think the waste gate is staying open! when I start the engine, the shaft moves from open to closed to open again! Does anyone know what I may have done? 
I mashed the gas and picked up some speed, but the next time I used the truck I noticed that I couldn't heard the turbo "at all". I think the waste gate is staying open! when I start the engine, the shaft moves from open to closed to open again! Does anyone know what I may have done?
Senior User
Joined: May 2004
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From: Vancouver
My understanding is that 95-97 do not have a waste gate and that the valve that you see opening and closing and then reopening is the back pressure valve, and I believe that it cycles like you described every time you start the truck and if were cold out it would stay shut until it were to warm up.
Post Fiend
Joined: Aug 2002
Posts: 5,324
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From: Denton,TX
95psd is correct, the 1994.5-1997 PSDs (and the 1998 in vans) don't have a wastegate. You may have a problem with the exhaust backpressure valve. That's the butterfly valve that is supposed to close when it's cold to help warm the engine up quicker. The easiest way to tell if this is the problem is to unplug it and see if you have the same symptoms. The air intake on these older engines is also very restrictive and known for leaking. You should check to make sure no dust has been getting past the air intake that might have caused turbo damage. You might also consider buying a Tymar air intake ($109 for our trucks) which will allow the turbo to spool up faster and decrease restriction.
Last edited by johnsdiesel; Jul 7, 2004 at 04:57 PM.
Fleet Mechanic
Joined: Oct 2003
Posts: 1,764
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From: CentralEastern Utah
I had a similar problem when I first bought my truck. Pulling a load and the turbo went away and lost power. Turned out that my MAP sensor line had blown off the y-pipe. The tube had got hard and did'nt fit tight enough so I trimmed the end a stuck it back on, no problems since. I also found a couple loose boots on the y-pipe that were letting my boost go also. Just an idea.
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Joined: Apr 2004
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Itfox, can you post pictures of the area concerned? I am having the same problem, (just started today). Yesterday, I had the Cat cut off and put a straight pipe in it's place. Ran like a champ. This morning, I go to use the truck and at startup, runs ruff and while driving has no power. Also I can't hear the turbo wind up. I thought the turbo might have seized. TIA for any help,
Fleet Mechanic
Joined: Oct 2003
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From: CentralEastern Utah
Sorry, no pic but just flip the lid up on your engine cover and their is a couple orange rubber boot s that connect a Y looking pipe to the engine. The MAP sensor line comes off it also and runs to the firewall on the passanger side where the sensor is located. I would just start at the turbo and check for loose clamps and leaks going into the intake.
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Joined: Apr 2004
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Originally Posted by johnsdiesel
95psd is correct, the 1994.5-1997 PSDs (and the 1998 in vans) don't have a wastegate. You may have a problem with the exhaust backpressure valve. That's the butterfly valve that is supposed to close when it's cold to help warm the engine up quicker. The easiest way to tell if this is the problem is to unplug it and see if you have the same symptoms. The air intake on these older engines is also very restrictive and known for leaking. You should check to make sure no dust has been getting past the air intake that might have caused turbo damage. You might also consider buying a Tymar air intake ($109 for our trucks) which will allow the turbo to spool up faster and decrease restriction.
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Post Fiend
Joined: Aug 2002
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From: Denton,TX
Originally Posted by coollooking96F350
So does this mean that when it warms up(even if the valve stays stuck open) it will run like normal? Or does it stay close and feel lagging? If you unplug it, does is stay open or close, I am unclear on this. TIA,
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Originally Posted by johnsdiesel
If you unplug it the valve would stay open. It's the easiest way to figure out if that's the problem or not. Many people have completely removed the valve, so unplugging it isn't a big deal. If it's not functioning properly it could be stuck partially closed or be working irregularly.
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Originally Posted by johnsdiesel
There should be a plug with 2 wires on the valve near the turbo. Unplug that.
. What if the replacement pipe collapsed? Just throwing out ideas. Would an engine scan be able to figure it out? TIA,
Last edited by coollooking96F350; Jul 12, 2004 at 01:14 PM.
Postmaster
Joined: Feb 2000
Posts: 2,759
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From: Auburn,Al
you might try asking the guys on ford-trucks.com 94-97 forums
you are a step in teh right direction losing that cat!
i would gut the EBPV next, lose the stock intake and such
when my truck was stock i couldnt hear the turbo at all
you are a step in teh right direction losing that cat!
i would gut the EBPV next, lose the stock intake and such
when my truck was stock i couldnt hear the turbo at all