7.3 white smoke, rough idle - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 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.

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Old 06-17-2008, 09:27 AM   #1 (permalink)
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7.3 white smoke, rough idle

Hey guys, we have an early '99 7.3L psd work truck with 220K on it. It was running perfect until a couple days ago. The truck started running rough and blowing white smoke. My first thought is low compression from bad rings but I have never seen one go from great to horrible in a day. My experience is that "usually" they will gradually become worse and worse until failure. Well, this one has no power now and actually died in an intersection yesterday while pulling a small trailer. If you remove the oil fill cap when its idling, it blows a steady puff, puff, puff, puff of white smoke out the oil fill tube like its missing badly. The guys took it to a "shade tree" shop who said it has low compression in #5 but I'm not sure they really checked it..

Could this be a bad injector dumping fuel, causing the white smoke? I know white smoke is un-atomized diesel fuel which = BAD I have seen trucks with bad injectors blow white smoke though.. So before we spend the money for a tear down / re-buiild, I would like to have more accurate diagnosis.

Bad HPOP?

I would like to do a compression check myself, I just don't have the gauges to do it.. (Might be time to get some) Where / what brand do you suggest?

Any help is appreciated!!

Thanks guys!
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'99, 7.3L PSD F250 4x4 SRW
Mods: BTS Tranny!!!!, Rockwell 2 1/2 ton axles, Goodyear MVT 395/85R20's and Schaeffer's Oil

'02, 7.3L PSD 6spd F350 4x4 DRW CC
Mods: IH Bellowed Up-pipes, 4" MBRP Turbo Back Exh, B&W Gooseneck Hitch, Michelin LTX A/T2 235/85R16's and Schaeffer's Oil

Last edited by Muddinf2501999; 06-18-2008 at 12:07 AM.
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Old 06-17-2008, 12:26 PM   #2 (permalink)
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Sounds like a good time to invest in AutoEnginuity.

I think I'd do that, or at least borrow an AE setup from a buddy before tearing into it. It could be as simple as a bad IPR or ICP causing low HP oil pressure.

If you get as deep as pulling the VC's for a compression check, I got a compression gauge from an internet tool supplier for around $50 for the whole setup. Gauge and GP adapter that snaps onto the gauge with a quick connect.
Star Products TU-15P Compression Tester - Compression / Press Test
Star Products TU-15-22A Compression Tester - Compression / Press Test
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99.5 F250 PSD Supercab LB 4x4, ZF-6 w/SB Con OFE, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, DP 80 HP Econo PCM (classic version), AIS, coolant filter w/"hokum" bracket, regulated return, heated mirror mod, lighted cupholder, Marinco heater plug-in.

Hard or no-start? Check Here
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Old 06-18-2008, 12:05 AM   #3 (permalink)
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Thanks for the info!

Would the code scanners at Napa, Autozone etc be able to diagnose an ICP, or IPR problem? Or does it require a more in depth version such as the AE scanner. I don't know anyone close by with a scanner other than a parts store like mentioned..

I will try to get the codes scanned tomorrow.

Thanks again!
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'99, 7.3L PSD F250 4x4 SRW
Mods: BTS Tranny!!!!, Rockwell 2 1/2 ton axles, Goodyear MVT 395/85R20's and Schaeffer's Oil

'02, 7.3L PSD 6spd F350 4x4 DRW CC
Mods: IH Bellowed Up-pipes, 4" MBRP Turbo Back Exh, B&W Gooseneck Hitch, Michelin LTX A/T2 235/85R16's and Schaeffer's Oil
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Old 06-18-2008, 01:19 AM   #4 (permalink)
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My truck starting smoking real bad and then lost power. The oil quantity was also increasing. I had to put in new injectors and a fuel pump. I found that most of the injectors had bad o rings. My truck also has 220k on it. The people I talked for help said with that many miles change the injectors not just the o rings.

Can't say for sure this is your problem but it sounds similar to me.
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Old 07-01-2008, 10:36 AM   #5 (permalink)
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Well, I had the codes read at Napa. No codes at all. No check engine light either.

It seems like its time to check compression. Any other suggestions before I check the compression? The napa code reader only worked while the truck was off so I don't know if it was an accurate reading or not...

Thanks!
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'99, 7.3L PSD F250 4x4 SRW
Mods: BTS Tranny!!!!, Rockwell 2 1/2 ton axles, Goodyear MVT 395/85R20's and Schaeffer's Oil

'02, 7.3L PSD 6spd F350 4x4 DRW CC
Mods: IH Bellowed Up-pipes, 4" MBRP Turbo Back Exh, B&W Gooseneck Hitch, Michelin LTX A/T2 235/85R16's and Schaeffer's Oil
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Old 07-01-2008, 09:29 PM   #6 (permalink)
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Most of the places that will read your codes for free don't have scan tools that work on a PSD. So you didn't gain any information there. Could still have codes there that will tell you where to start troubleshooting.

First thing I'd try would be to pull the wiring connector off the ICP sensor when it's running. If it clears up, then check the sensor wiring and fix it, or replace the sensor.
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First truck -- 1929 Model A Ford pickup, restored from ground up. Wish I still had it!
99.5 F250 PSD Supercab LB 4x4, ZF-6 w/SB Con OFE, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, DP 80 HP Econo PCM (classic version), AIS, coolant filter w/"hokum" bracket, regulated return, heated mirror mod, lighted cupholder, Marinco heater plug-in.

Hard or no-start? Check Here
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Old 07-01-2008, 11:44 PM   #7 (permalink)
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Ok, I will do that in the morning. I will let you know what happens.

Thanks!
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'99, 7.3L PSD F250 4x4 SRW
Mods: BTS Tranny!!!!, Rockwell 2 1/2 ton axles, Goodyear MVT 395/85R20's and Schaeffer's Oil

'02, 7.3L PSD 6spd F350 4x4 DRW CC
Mods: IH Bellowed Up-pipes, 4" MBRP Turbo Back Exh, B&W Gooseneck Hitch, Michelin LTX A/T2 235/85R16's and Schaeffer's Oil
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Old 07-02-2008, 09:05 AM   #8 (permalink)
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Quote:
Originally Posted by klhansen View Post
Most of the places that will read your codes for free don't have scan tools that work on a PSD. So you didn't gain any information there. Could still have codes there that will tell you where to start troubleshooting.

First thing I'd try would be to pull the wiring connector off the ICP sensor when it's running. If it clears up, then check the sensor wiring and fix it, or replace the sensor.
Ok, I pulled the ICP plug off the sensor with it running and for a split second you could hear a very very slight change in the idle but it went right back to the same rough idle. Then I plugged the sensor back in with it running and there was no change at all. I noticed that the snap on the harness is broken off so I was able to just pull the plug out very easy. I think the "Shop" the guys took the truck to must have broken that clip and not said anything.. However, it was running bad before they looked at it so I dont think the broken clip is hurting anything at the moment. I tried it a second time by plugging it back in with the truck off and then starting it again and pulling it off. The second time there was no change in the idle at all.

I spoke with the guy who took the truck to the shop about what exactly they said. The shop told him that "The passenger side rear injecor was stuck open which dumped fuel in the cylinder washing out the rings which has caused bad compression in that cylinder." He fixed or replaced the injector but the damage was done. I don't know how credible this shop is but it sounds like a logical explanation. The truck has had a tough life of pulling heavy loads and being driven by many different employees so maybe 220K is not bad but I have never seen a 7.3 lose compression that soon...

Thanks!
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'99, 7.3L PSD F250 4x4 SRW
Mods: BTS Tranny!!!!, Rockwell 2 1/2 ton axles, Goodyear MVT 395/85R20's and Schaeffer's Oil

'02, 7.3L PSD 6spd F350 4x4 DRW CC
Mods: IH Bellowed Up-pipes, 4" MBRP Turbo Back Exh, B&W Gooseneck Hitch, Michelin LTX A/T2 235/85R16's and Schaeffer's Oil

Last edited by Muddinf2501999; 07-02-2008 at 09:28 AM.
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Old 07-09-2008, 05:43 PM   #9 (permalink)
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Well, its toast!

Need a long block if anyone knows where to locate one that would be a big help!
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'99, 7.3L PSD F250 4x4 SRW
Mods: BTS Tranny!!!!, Rockwell 2 1/2 ton axles, Goodyear MVT 395/85R20's and Schaeffer's Oil

'02, 7.3L PSD 6spd F350 4x4 DRW CC
Mods: IH Bellowed Up-pipes, 4" MBRP Turbo Back Exh, B&W Gooseneck Hitch, Michelin LTX A/T2 235/85R16's and Schaeffer's Oil
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Old 07-15-2008, 05:55 PM   #10 (permalink)
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Anyone? Suggestions? I have been looking on some sites but have not found what I'm looking for yet..
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'99, 7.3L PSD F250 4x4 SRW
Mods: BTS Tranny!!!!, Rockwell 2 1/2 ton axles, Goodyear MVT 395/85R20's and Schaeffer's Oil

'02, 7.3L PSD 6spd F350 4x4 DRW CC
Mods: IH Bellowed Up-pipes, 4" MBRP Turbo Back Exh, B&W Gooseneck Hitch, Michelin LTX A/T2 235/85R16's and Schaeffer's Oil
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Old 07-16-2008, 09:22 AM   #11 (permalink)
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You can't rebuild the engine? Thats got to be a good alternative to buying a used engine.
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Old 07-18-2008, 10:30 AM   #12 (permalink)
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I need to put a pencil to it but I thought it would be much more expensive to do a rebuild by the time you get the machine work done, rebuild kit etc. I do like the idea of knowing what I'm getting with that option but I don't know how much that would cost.


Does anyone have an estimated cost for doing a rebuild on it? (Machine work, rebuild kit, assembly, etc.) We're going to do the tear down / install
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'99, 7.3L PSD F250 4x4 SRW
Mods: BTS Tranny!!!!, Rockwell 2 1/2 ton axles, Goodyear MVT 395/85R20's and Schaeffer's Oil

'02, 7.3L PSD 6spd F350 4x4 DRW CC
Mods: IH Bellowed Up-pipes, 4" MBRP Turbo Back Exh, B&W Gooseneck Hitch, Michelin LTX A/T2 235/85R16's and Schaeffer's Oil
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Old 01-12-2011, 03:38 AM   #13 (permalink)
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Hey bud if u haven't figgured it out yet. Try the injector o rings they allways gobad and cause white smoke from the exhaust .that's usualy the main prob with the 7.3 . And wthe white smoke is called blow back and it is common on the older dieseils with high miles and that have had a hard life. My 95 250 psd has it to u can't realy get it fixed unless u get new rings or a new motor . But if u got it fixed . Sweet deal !b
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Old 01-12-2011, 07:46 PM   #14 (permalink)
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Quote:
Originally Posted by Muddinf2501999 View Post
Well, its toast!
Did I miss something? What happened??? What caused it to be toast?
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