7.3L Power Stroke Engine and DrivetrainDiscussion of the 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.
Last night I was returning from the airport, temps at 36 F and driving into a 50 mph headwind, and noticed my truck began to run rough. I pulled over to a gas station and heard a puffing/thumping noise. I popped the hood and could hear the puffing/thumping noise coming from the area just before the air intake part of the turbo. When I put my hand on the hose that leads from the air cleaner to the turbo I could feel the puffing and thumping. I shut the engine down and looked for leaks or anything that stood out and found nothing. I was a little low on oil so I added some. Other than that I saw nothing that alarmed me. I restarted the truck and it started immediately. I nursed it home 30 miles and when I stopped again the noise/thumping wasn't as loud as before but the engine continued to run rougher and rougher. When accelerating while driving I could hear the turbo kick in as normal and everything would smooth out, but once I backed off it ran rough again.
I just went out this morning and the trucked started just fine but is still running rough. I have no fluid leaks or obvious/noticeable indications that something is wrong just the rough running. If it were a gasser is would suspect a bad spark plug or plug wire.
Anyone have any ideas. The truck just had new heads and a new HPOP installed less that 3K ago. It’s a early 99 with 275K on it.
Hard to figure how rough you say it's running, does it sound as bad as being down to 4 cylinders? Does it have any codes, or the SES light on? I would suspect the UVC harness(under valve cover) It supplies all needed signals/voltages to the injectors and glow plugs. It could be the connection outside the cover, in the valley right at the gasket(It's part of the connection,,) Or the inside connection, or a bad harness inside, (they crack and get brittle from the heat and oil I guess.)
Even if it doesnt sound bad enough to be 4 cylinders it could still be that with only a couple bad ones on one side...(Figure wireing more than the actual injectors.)
Just a thought and place to start,
does it sound like it's starving for fuel? If you dont have any SES light then it could be fuel related, 36* is not cold enough to "Gell" but your fuel pump could be going south,, (seems like everytime I hear of one going bad, it is in the winter... [img]/ubbthreads/images/graemlins/shrug.gif[/img] Dont know if there is any coincedence to that or not????)
And just guessing with that many miles, and being a 99, it wouldnt be uncommon to have it fail finaly.... [img]/ubbthreads/images/graemlins/phoney.gif[/img]
IT IS an expensive part to "Shotgun" though! (over 250.00 at Ford, depending on how good you are with them!! Being a GM employee, I get an employee discount there, (the parts mgr saw my GM shirt the first time I went in and bought something, and takes care of me all the time now!) [img]/ubbthreads/images/graemlins/wink.gif[/img]
__________________
Jim T.*48* SLAPS Co-Founder, 30.8 yrs RETIRED UAW 6/01/06, Now a full time Technician in the MOANG 12/10/07 My pics! and my New'03 Dually pics!, Charcoal Grey, Black and Grey interior, Black leather seats, Van Turbo/ATS ported housing/WW, Quad "A" pillar pod with Carbon Fiber series AUTO METER Gauges, FUMOTO Valve. BTS BUBBA" /TS 4pos chip, 4" Turbo back straight pipe/stainless 5" tip 131st F/W St.Louis MoAirNatlGuard We're losing the F-15s. BUT BEING HANDED THE KEYS TO THE B-2 BOMBERS at WHITMAN AFB, Near Kansas City, MO.!! We are Lindburghs OWN! Suffering from *PMS,, "Powerstroke mod syndrome"
It doesn't sound like its running on 4 cylinders more like 7. Like I said if it were a gasser I would suspect a bad plug or plug wire. It could be starving for fuel I wouldn't rule that out. I will check the wiring as you suggested. will also change my fuel filter as well. Thanks for your quick response
[/ QUOTE ]Does it sound like something stuck in an exaust, Valve ? Just a thought...
__________________
Rick.....
97 F 350 ...Lucky 13 "Most stuff's just stuck & needs hittin with a hammer"....
Supporter/End user of ShiftSolutions THE CURE E4/4R Trans Control. Helping Cancer patients and families
fordtransmissioncure.com
Special thanks to RacerX
racerxautomotive.com
Hmm, sounds a lot like the problem I am having with my 02. I have tried pulling codes. None found.
Poked around under the hood a little. ONly thing I actually found was my passenger side PVH hard line was broken. Fixed that but still have a rough idle and running under load.
I am going to take a look at the UVH wiring and such maybe tomorrow.
Don't want to hi-jack the thread it just sounds exactly like my problems too.
__________________
Sisu is a unique Finnish concept. It stands for the philosophy that what must be done will be done, regardless of what it takes. Sisu is a special strength and persistent determination and resolve to continue and overcome in the moment of adversity…an almost magical quality, a combination of stamina, perserverance, courage, and determination held in reserve for hard times.
To some that means we're stubborn!
The DD........
2002 F350 SRW 7.3PS Lariat. Black, 33" tires, AFE stage II intake, 4x4, super cab, long box, leather, Raider cap, "X" code front springs, "C" code rear springs, Rancho RS9000XL shocks, 96" Arctic Heavy Duty plow.
My early 99 had ONE bad injector shortly after I got it,, and you could BARELY tell there was a miss,, I mean it was very subtle..
Do you know anyone that has Autoenginuity? If your going to work on your truck alot yourself, it is a good investment, for sure.
It will do injector buzz tests, Cylinder contribution tests, ect...
Could be very helpfull in diagnosing your problem.
__________________
Jim T.*48* SLAPS Co-Founder, 30.8 yrs RETIRED UAW 6/01/06, Now a full time Technician in the MOANG 12/10/07 My pics! and my New'03 Dually pics!, Charcoal Grey, Black and Grey interior, Black leather seats, Van Turbo/ATS ported housing/WW, Quad "A" pillar pod with Carbon Fiber series AUTO METER Gauges, FUMOTO Valve. BTS BUBBA" /TS 4pos chip, 4" Turbo back straight pipe/stainless 5" tip 131st F/W St.Louis MoAirNatlGuard We're losing the F-15s. BUT BEING HANDED THE KEYS TO THE B-2 BOMBERS at WHITMAN AFB, Near Kansas City, MO.!! We are Lindburghs OWN! Suffering from *PMS,, "Powerstroke mod syndrome"
[ QUOTE ]
Don't want to hi-jack the thread it just sounds exactly like my problems too.
[/ QUOTE ] I wouldnt call THIS hi-jacking, if your problem is extremely similar,, just killin two PROBLEMS with one thread!! (HOPEFULLY)
OP, when you pull the fuel filter make sure you look before and see how full the bowl is,,, it should be to the brim,,, before you remove the filter of course!
__________________
Jim T.*48* SLAPS Co-Founder, 30.8 yrs RETIRED UAW 6/01/06, Now a full time Technician in the MOANG 12/10/07 My pics! and my New'03 Dually pics!, Charcoal Grey, Black and Grey interior, Black leather seats, Van Turbo/ATS ported housing/WW, Quad "A" pillar pod with Carbon Fiber series AUTO METER Gauges, FUMOTO Valve. BTS BUBBA" /TS 4pos chip, 4" Turbo back straight pipe/stainless 5" tip 131st F/W St.Louis MoAirNatlGuard We're losing the F-15s. BUT BEING HANDED THE KEYS TO THE B-2 BOMBERS at WHITMAN AFB, Near Kansas City, MO.!! We are Lindburghs OWN! Suffering from *PMS,, "Powerstroke mod syndrome"
Hmm, the only things I can think on my problem that may help are.
1. I do have a MIL showing. No codes to pull but the MIL does show.
2. The problem started after the truck sat for a few days in -20*C weather.
3. The first time I noticed it it was VERY hard to start. Once started it idled rough, just like when cold. It warmed up but the rough idle didn't go away. It did for about 5 seconds kick back up to a smooth idle, then back to rough.
4. I have replaced the CPS as I thought it might be the cause. It was very rough for a while and almost stalling out while driving.
How easy is it to get at all the bolts to remove the valve covers? That engine seems crammed back in there pretty good.
I think I will be ordering the AE Ford kit this week. Since all we drive are Fords it will come in handy for every vehicle we have.
__________________
Sisu is a unique Finnish concept. It stands for the philosophy that what must be done will be done, regardless of what it takes. Sisu is a special strength and persistent determination and resolve to continue and overcome in the moment of adversity…an almost magical quality, a combination of stamina, perserverance, courage, and determination held in reserve for hard times.
To some that means we're stubborn!
The DD........
2002 F350 SRW 7.3PS Lariat. Black, 33" tires, AFE stage II intake, 4x4, super cab, long box, leather, Raider cap, "X" code front springs, "C" code rear springs, Rancho RS9000XL shocks, 96" Arctic Heavy Duty plow.
IF you have a MIL, or SES light you have codes, Autozone wont see all the codes these can throw,,,(Generic reader) AE will see them all, [ QUOTE ]
How easy is it to get at all the bolts to remove the valve covers? That engine seems crammed back in there pretty good.
[/ QUOTE ] Really is not that hard,, once you remove the air filter tube, (when you take that off you have to remove the CCV "Filter" Housing off the drivers VC), CAC tubes, and on the passenger side the oil fill extention attatches to the valve cover just like the cap does, twist it and remove it too, it will make that cover much easier to ge out from under the heater hoses, ect...The "MAF" sensor bracket, (Three small nuts I think) if you remove it and lay it up out of the way too, it helps) then if you have a 3/8" universal, deep and shallow sockets, and 3" extention you can get to every bolt/nut on there, with some contortions of your body! Well at the least laying across the front radiator support, on your knees up there, ect... you can get to them. I am average size, 5'10" 180. I guess if your 6'6" an 250 or so,, it may be harder..? Dont know for sure!
__________________
Jim T.*48* SLAPS Co-Founder, 30.8 yrs RETIRED UAW 6/01/06, Now a full time Technician in the MOANG 12/10/07 My pics! and my New'03 Dually pics!, Charcoal Grey, Black and Grey interior, Black leather seats, Van Turbo/ATS ported housing/WW, Quad "A" pillar pod with Carbon Fiber series AUTO METER Gauges, FUMOTO Valve. BTS BUBBA" /TS 4pos chip, 4" Turbo back straight pipe/stainless 5" tip 131st F/W St.Louis MoAirNatlGuard We're losing the F-15s. BUT BEING HANDED THE KEYS TO THE B-2 BOMBERS at WHITMAN AFB, Near Kansas City, MO.!! We are Lindburghs OWN! Suffering from *PMS,, "Powerstroke mod syndrome"
I am begining to t believe that I got a bad patch of fuel. Here is why. I stopped and got fuel from a location that I normally dont go to. It is a small truck stop but when filling the tank two days before this problem it was extremely cold for central Kansas. -10F with the wind blowing like hell. I stopped to fill the tank at teh Diesel pickup pump and after 15 mins is still wasn't full. Needless to say the pump was pumping extremely slow. I realy never filled the tank just shut it down and just wanted to get home with the tank at 3/4. If I tally the miles from the fill until the problems it would be less than 180 miles since I stopped for fuel. I'm down to a 1/4 of a tank now. I just changed the fuel filter and drained the fuel water separater. The fuel pump seems to be working fine. Truck started after two cranks and I did give the fuel pump plenty of time to repressure. It is still running rough. I will add an antijell additive and see if that helps.
Thanks for all the tips and I'll try everything suggested.
Someone asked how long my truck was at the airport, it sat there for three days.
I figured I couldn't get all the codes that could be there. I am going to order the AE package but want to get this looked at soon. I will be in the city tomorrow having the plow installed so i am going to stop at one of the dealers I trust since they are just down the road. I don't mind paying for their diagnostics since this truck is a work truck and is worth too much to risk damaging the engine by driving it too much.
I checked today by unplugging that one sensor that controls the system running the injector pressures. It didn't run any different with it unplugged. Don't know if that helps at all.
I thought I might have a bad tank of fuel as well so I filled at a different station. No change so far.
__________________
Sisu is a unique Finnish concept. It stands for the philosophy that what must be done will be done, regardless of what it takes. Sisu is a special strength and persistent determination and resolve to continue and overcome in the moment of adversity…an almost magical quality, a combination of stamina, perserverance, courage, and determination held in reserve for hard times.
To some that means we're stubborn!
The DD........
2002 F350 SRW 7.3PS Lariat. Black, 33" tires, AFE stage II intake, 4x4, super cab, long box, leather, Raider cap, "X" code front springs, "C" code rear springs, Rancho RS9000XL shocks, 96" Arctic Heavy Duty plow.
I am begining to t believe that I got a bad patch of fuel. Here is why. I stopped and got fuel from a location that I normally dont go to. It is a small truck stop but when filling the tank two days before this problem it was extremely cold for central Kansas. -10F with the wind blowing like hell. I stopped to fill the tank at teh Diesel pickup pump and after 15 mins is still wasn't full. Needless to say the pump was pumping extremely slow. I realy never filled the tank just shut it down and just wanted to get home with the tank at 3/4. If I tally the miles from the fill until the problems it would be less than 180 miles since I stopped for fuel. I'm down to a 1/4 of a tank now. I just changed the fuel filter and drained the fuel water separater. The fuel pump seems to be working fine. Truck started after two cranks and I did give the fuel pump plenty of time to repressure. It is still running rough. I will add an antijell additive and see if that helps.
Thanks for all the tips and I'll try everything suggested.
Someone asked how long my truck was at the airport, it sat there for three days.
[/ QUOTE ]
I had asked about how long it was sitting. Since it has been so cold around here made me wonder if you weren't having some cold weather issues. You might grab a bottle of Power Service and shoot her a dose for the next couple of fill ups. Its warming up around here so hopefully that will help. If you get down near Wichita give me a holler and we can pull codes.
__________________
Just eating rainbows and butterflies
Hey thanks alot. I am actually in Wichita as I type this. My wife and I are heading for Tokyo for a week. I'm working and she will be site seeing. I will take you up on your offer to pull codes. I am in Wichita every week, mostly flying out to train Firefighters all over the US and sometimes International. I left the truck at home. I did add a gallon of anti gell boost that Iought from Tractor Supply.
Linear Mode
