7.3 lag problem - Diesel Forum

AGGRO · 12-25-2012, 04:33 PM

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?

PATRICK4 · 12-25-2012, 05:55 PM

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?

AGGRO · 12-27-2012, 09:38 AM

Quote:

Originally Posted by PATRICK4

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.

OBXNC · 12-27-2012, 10:38 AM

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.

PATRICK4 · 12-27-2012, 05:55 PM

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.

AGGRO · 12-28-2012, 11:08 PM

Quote:

Originally Posted by OBXNC

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.

Quote:

Originally Posted by PATRICK4

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.

PATRICK4 · 12-30-2012, 08:34 PM

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.

Gekko_hauler · 12-31-2012, 06:36 PM

Sounds like an injector or sensor issue. Have you tried to pull any codes or run any diagnostic software?

AGGRO · 03-20-2013, 04:33 PM

Finally figured out what it was.

7.3 black smoke and runs rough