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Thread: Sometimes runs very rough then smooths out

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    Default Sometimes runs very rough then smooths out


    WHEN IT HAPPENS: sometimes in cold weather, but many times in cold weather it does not happen. It just seems to happen when it wants to, not because of any set of confitions.

    WHAT HAPPENS: The truck will start and run kind of rough, like it is missing 2 cylinders, or very rough, like it is missing 5 cylinders. The amount of power it has corresponds to how many cyliners it seems to be running on. When it is very rough, I have to put it in 4 wheel Lo to back it out of my gently sloping driveway.

    WHEN IT STOPS: After I have driven for about 5 minutes at up to 2000 RMP it will run smooth as silk with all the power it normally has. It will do 90 on the interstate easily.

    My injectors have 150k to 200k miles on them. I can't understand why they would operate so poorly and then run so smoothly.

    It only runs rough for 5 minutes after I have started it.


    Any ideas?

    Thanks,


    BigRedWeather
    97 F350 7.3L Diesel 4X4 Crew Cab long bed 320,000 miles, single mass flywheel, no mods

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    Supporting Member OLDBULL8's Avatar
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    Have you ever checked the UVCH harness under the valve covers? Loose connections there will cause that.
    Sent from my Dell puter, Miss spels a lot a wards, a woords.

    You said what?
    I'm not Crazy, my Mother had me tested!

    "99.5 F350 7.3 PSD 4R100 CC LB 4X4 DRW 4:10 Centurion Conv.
    ScanGaugeII SPDiesel Performance Module 40-60-80 HP -- A Pillar - Boost - Pyrometer - Trans.Temp. - Engine Oil Temp.GN Hitch 20K -- Reese 16K 5er Hitch - Draw Tite Brake Control - Aux. Trans. oil cooler - 100 Gal. Transfer Flow fuel tank, W/Trax II computer. DIY black bed liner. Red Knight

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    Let me think through this with you...

    If the injectors weren't getting the proper signal because of a faulty harness I could understand that the truck would run very rough, but I don't see why that would only happen for the first 5 minutes of driving and then disappear for the next 5 hours.

    If it is a faulty connection in the harness I could see the rough running 1 out of 3 times I start it and not the other 2 because the connection comes and goes.

    I have no conclusions yet, I'm still asking questions.

    More comments from you would be welcome, oldbull8.
    97 F350 7.3L Diesel 4X4 Crew Cab long bed 320,000 miles, single mass flywheel, no mods

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    Senior Member 94f450sd's Avatar
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    does it make a loud hissing sound when it does this?
    Rich

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    : Only after the last tree has been cut down, Only after the last river has been poisoned, Only after the last fish has been caught, Only then, will you find money can't be eaten.
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    Supporting Member OLDBULL8's Avatar
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    Everything expands when heated up. Don't the 97's have the dual connection on each head. You either check them or not, a good place to start, no cost, just a little labor.

    http://www.forddoctorsdts.com/articl...icle-05-10.php
    Sent from my Dell puter, Miss spels a lot a wards, a woords.

    You said what?
    I'm not Crazy, my Mother had me tested!

    "99.5 F350 7.3 PSD 4R100 CC LB 4X4 DRW 4:10 Centurion Conv.
    ScanGaugeII SPDiesel Performance Module 40-60-80 HP -- A Pillar - Boost - Pyrometer - Trans.Temp. - Engine Oil Temp.GN Hitch 20K -- Reese 16K 5er Hitch - Draw Tite Brake Control - Aux. Trans. oil cooler - 100 Gal. Transfer Flow fuel tank, W/Trax II computer. DIY black bed liner. Red Knight

    "92" F350 7.3 IDI CC LB DW E4OD US Gear O/U 4:10 Gauges EGT--Boost--Trans.Temp--Banks turbo White Knight

    AutoEnginuity with Ford Enhanced.

    My mind works lightening fast.
    One FLASH and it's gone forever.

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    Senior Member 94f450sd's Avatar
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    Yes the 94-97 have 2 connectors on each head.but 95% of the complaints during the winter are caused by the ebpv.wich is normal.
    Rich

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    : Only after the last tree has been cut down, Only after the last river has been poisoned, Only after the last fish has been caught, Only then, will you find money can't be eaten.
    95 F350 XLT,CC,DRW.gone but not forgotten


    1982 pontiac grand prix LJ.pontiac V8 transplant in the future.

    Goin back to my roots.gas motors and pontiacs!

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    Thanks OldBull8. I was checking my GPs last weekend and only got to those on the passenger side, so I have disconnected and connected those connectors. I will check the other side.

    94f450sd, No, it does not make a loud hissing sound. I am getting a handle on what happens with the EBPV system, but don't know it in detail. Does anyone know a good web page that details exactly what happens?

    The Sensor tells the regulator to change the flow of oil into the actualtor that moves the linkage to open or close the valve. I assume the valve closes when you start up on a cold day, but it must leave a hole for some exhaust to get out or the engine would stall.

    I'm going to go put my head under the hood and see what I find.

    Thanks for the input, past and future


    BigRedWeather
    97 F350 7.3L Diesel 4X4 Crew Cab long bed 320,000 miles, single mass flywheel, no mods

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    What do you suspect is happening, the valve is opening or closing at the wrong time? What do you suspect is causing that, the sensor, regulator, actuator?

    It helps me solve a problem to know the why, and not just the what. So if you suspect what is going on, I would appreciate the why behind it, if possible.

    Thanks,


    BigRedWeather
    97 F350 7.3L Diesel 4X4 Crew Cab long bed 320,000 miles, single mass flywheel, no mods

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    Registered User powerhungry07's Avatar
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    Stupid question I was reading this thread I have some of the same Problems just always took it as it's not warmed up yet.when driving it in the cold I hear a hissing /vAcum sucking noise and I can watch my rpms slowly drop and the truck slow down. It's probably something simple but idl and with me being new at this and seeing it come up in conversation I figured I'd ask. thanks
    P.S. Sorry BigRedWeather for using your thread to ask
    DIRTY DEEDS

    1997 Ford F250 PSD
    170k 5spd STOCK slow as hell
    First Diesel
    First Car : 1978 Dodge Lil Red Express
    now with a mopar 383 bb for motovation
    for info on the lil reds since not very common :
    http://www.dodgeconnection.com/LilRedInfo.html

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    I don't hear the sound of sucking air. Our symptoms seem similar by not identical.

    My next step is to see if there are any codes and go from there.


    BigRedWeather
    97 F350 7.3L Diesel 4X4 Crew Cab long bed 320,000 miles, single mass flywheel, no mods

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    Senior Member 94f450sd's Avatar
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    Quote Originally Posted by powerhungry07 View Post
    Stupid question I was reading this thread I have some of the same Problems just always took it as it's not warmed up yet.when driving it in the cold I hear a hissing /vAcum sucking noise and I can watch my rpms slowly drop and the truck slow down. It's probably something simple but idl and with me being new at this and seeing it come up in conversation I figured I'd ask. thanks
    P.S. Sorry BigRedWeather for using your thread to ask
    Yours is the ebpv.completely normal.on the compressor side of the turbo there is a black plug bolted to the turbo.unplug it if this bothers you.its function is to close off the exhaust to force the motor to warm up on cold starts and during extended idling
    Rich

    Pictures:
    http://s1285.photobucket.com/albums/a590/f450sprdty

    : Only after the last tree has been cut down, Only after the last river has been poisoned, Only after the last fish has been caught, Only then, will you find money can't be eaten.
    95 F350 XLT,CC,DRW.gone but not forgotten


    1982 pontiac grand prix LJ.pontiac V8 transplant in the future.

    Goin back to my roots.gas motors and pontiacs!

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