Possible exhaust back pressure problem?
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Possible exhaust back pressure problem? - 11/9/2006 11:37:20 AM
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rickcaspari
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I have a 97 F250 HD 4x4 7.3L.Here's my problem.,I have almost no power, unless I let it warm up for 30 minutes.When I go to take off,I have to floorboard the accelerator to go with any authority.It feels like a brake is dragging or I'm in 2nd gear.When I accelerate, the truck feels like it down shifts and takes off.After about 15 minutes of run time,it's fine.The truck starts and run fine.Thanks for any advice.Rick.
< Message edited by rickcaspari -- 11/10/2006 1:04:48 PM >
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97 F250 4x4 Heavy duty 7.3L auto
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RE: Possible exhaust back pressure problem? - 11/11/2006 11:06:30 AM
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rickcaspari
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Here's where I'm at.I removed the tube running from the exhaust manifold to the exhaust back pressure sensor(I think that's what it's called).It had a slight build up off carbon.I went ahead and cleaned it.Tried to remove the sensor,but it is really tight and I didn't want to break anything so I left it alone.I still have the same symptoms.I disconnected the actuator plug by the turbo.Same thing.The valve itself is working,I think,It sounds to me I may have a bad sensor or the valve sticks until it gets good and hot.Any inputs?
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97 F250 4x4 Heavy duty 7.3L auto
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RE: Possible exhaust back pressure problem? - 11/11/2006 12:17:43 PM
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Hayapower
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Some power application 'delay' is normal in cold temps on the 7.3..
The valve operation is to help heat the engine coolant and raise cabin temps quicker..
As soon as you launch, the power should come on within a few seconds or more unless extreme cold temps....
The exhaust back pressure valve is controlled by the PCM.. The PCM reads the EOT (engine oil temp) and the IAT (intake air temp) as well as the exhaust pressure in the right exhaust manifold for valve operation for cold startup.. If the tube plugs, or the sensor is out of range, most times you'll get a CEL/DTC.. Since this seems to follow a warming pattern, chances are the valve isn't hanging.. What would really help would be to have it scanned/data stream pids checked for correct sensor PCM imputs at/for correct temps.. The backpressure sensors are pricey, and a data scan would tell you if its working OK without disturbing it.. If you can read the data info. it'll at least point you in a direction, or tell you what its not in most cases..The system will default to open, if the sensor/circuit fails.. Or should.. But out of range imputs may command the valve to close on a warmer engine..
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05 F250 C/C FX4 6.0
1969 Firebird Trans Am
2003 Hayabusa GSXR1300
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RE: Possible exhaust back pressure problem? - 11/11/2006 1:03:24 PM
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rickcaspari
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Thanks,It sounds like I'm off to the dealer.Boy I was trying to avoid that.
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97 F250 4x4 Heavy duty 7.3L auto
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RE: Possible exhaust back pressure problem? - 11/11/2006 1:34:19 PM
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Hayapower
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It may not be that bad..
So,, when your suffering from extended power loss, do you hear a consistant 'hissing' as well? indicating a closed/stuck valve.. Have you verified the valve is closed during warm up or on a heated engine? Open is with the valves tang on the bell crank against the casting stop, and the arm retracted.. Certainly sounds like a EBV issue, especially when you say it feels like a 'downshift' and the truck gains back it power.. On an accell, the EPR should be deactivated allowing for an open valve...
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05 F250 C/C FX4 6.0
1969 Firebird Trans Am
2003 Hayabusa GSXR1300
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RE: Possible exhaust back pressure problem? - 11/16/2006 7:49:25 PM
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masterexploder
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another big problem with the 7.3 is the under the valve cover looms come disconnected and will wipe out entire banks, all you have to do is pull the valve covers and check to see if one has come disconnected, is so they sell an update kit that isn't saposed to come apart
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if you can break it i've done it
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RE: Possible exhaust back pressure problem? - 12/10/2006 1:46:49 PM
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Ben 97
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you can unplug your EBPV to see if that is the problem. there is a plug in front and a little to the right of the turbo. It is the only two wire plug. Try unpluging that and see if it fixes your problem. It will take a little longer for your truck to warm up with it unpluged, but your truck will run fine. I have had mine unpluged for quite awhile.
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My Trucks,
1997 F250 ext cab 7.3, 5spd, one peice flywheel, 3" downpipe to 5" exaust to dual 6" bullhaulers, custom intake with K&N filter, Bully Dog 4pos chip, FPR mod, Autometer Gauges, Boost, Pyrometer, Oil Temp, 4"lift, Traction Bars, 35" tires, A
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