7.3 lag problem - 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 12-25-2012, 04:33 PM   #1 (permalink)
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7.3 lag problem

Ok, I've had this issue with my 2001 350 from the day I've got it used. If I don't start it then give it some quick gas it will act like it's flooded for about a mile. It will then clear and run normal. So long as I give it a quick tap on the peddle it's fine but when it floods or stalls it smokes like crazy and can be really annoying as it won't go over about 30 mph. Ideas?
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Old 12-25-2012, 05:55 PM   #2 (permalink)
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Hi Aggro, in order for people to help you troubleshoot, you should give them as much information as possible. Start by giving the year, make, and engine of your truck. Any other information is also good, such as mileage and any work or upgrades that you have done. The only question I have at this point is have you changed the oil and fuel filter?
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01 F-250 SD 7.3 POWERSTROKE SUPERCAB/LONGBED 146K MI, 3 gauge pillar, diy tymar intake, Edge Evolution Tuner, 26 row 6.0 trans cooler
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Old 12-27-2012, 09:38 AM   #3 (permalink)
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Originally Posted by PATRICK4 View Post
Hi Aggro, in order for people to help you troubleshoot, you should give them as much information as possible. Start by giving the year, make, and engine of your truck. Any other information is also good, such as mileage and any work or upgrades that you have done. The only question I have at this point is have you changed the oil and fuel filter?
2001 350 with 170k miles. 7.3 and it gets oil, fuel and air filters changed often. All stock. My local wrench couldn't figure it out but he said he is no diesel guy. It only does this on cold start.
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Old 12-27-2012, 10:38 AM   #4 (permalink)
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There are alot of cold start threads under FAQ section for 7.3's. I would start there. Here is a good read:

Hard/No Start? Check here first.
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Old 12-27-2012, 05:55 PM   #5 (permalink)
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What color is the smoke? (white or blue..ish) Also what is the temperature when this happens? Does it happen if you plug in the block heater? Could be the glow plug system like Obxnc suggested, but if this happens when it is warm out, you may have other issues.
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01 F-250 SD 7.3 POWERSTROKE SUPERCAB/LONGBED 146K MI, 3 gauge pillar, diy tymar intake, Edge Evolution Tuner, 26 row 6.0 trans cooler
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Old 12-28-2012, 11:08 PM   #6 (permalink)
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Originally Posted by OBXNC View Post
There are alot of cold start threads under FAQ section for 7.3's. I would start there. Here is a good read:

Hard/No Start? Check here first.
Thank you, I will peruse.
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Originally Posted by PATRICK4 View Post
What color is the smoke? (white or blue..ish) Also what is the temperature when this happens? Does it happen if you plug in the block heater? Could be the glow plug system like Obxnc suggested, but if this happens when it is warm out, you may have other issues.
Typically here in s Cal it doesn't get that cold and it doesn't seem to be a temp issue. No block heater and it's black smoke like unburned fuel. It does it no matter winter or summer.
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Old 12-30-2012, 08:34 PM   #7 (permalink)
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White smoke usually means glow plug issues. I would say black smoke is more likely a compression issue. Hopefully someone else will respond for you. Good luck.
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Old 12-31-2012, 06:36 PM   #8 (permalink)
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Sounds like an injector or sensor issue. Have you tried to pull any codes or run any diagnostic software?
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Old 03-20-2013, 04:33 PM   #9 (permalink)
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Finally figured out what it was.

7.3 black smoke and runs rough
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