Help with smoke
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4wd Low
Joined: Oct 2025
Posts: 11
Likes: 2
From: West Texas
Help with smoke
My 2001 f350 was having a little bit of a hard idle. I did a buzz test and two injectors failed. They were on opposite sides. I have a 99 f250 that i stopped driving.I swapped injectors on my 2001 7.3 with injectors off my other truck that had only 6 months of use. I removed and installed them with no error(to my knowledge). When starting the truck it was billowing smoke out the exhaust and under a little pedal it was worse than a coal train. I turned engine off, and went and did some running. After 3 hrs I started it up and no smoke under idle but still thick clouds under pedal. I am clueless to what I did wrong when I swapped the injectors. One of the injectors I swapped with looked like it had carbon buildup on it. Could that be the culprit?* even though two failed the buzz test i swapped all 8 because I figured having 8 injectors with 6 months of driving is better than only have two new injectors and 6 old injectors.
** buzz test comes back strong on all 8 injectors.
Doing a cylinder contribution test, shows cylinder 8 being inconsistent. Could this injector be stuck open mechanically? I put the injector with the carbon build up on cylinder 3
** buzz test comes back strong on all 8 injectors.
Doing a cylinder contribution test, shows cylinder 8 being inconsistent. Could this injector be stuck open mechanically? I put the injector with the carbon build up on cylinder 3
Laughing Gas
Joined: Nov 2020
Posts: 994
Likes: 367
From: Republic of Texas
#8 will almost always fail the contribution test, #3 sometimes acts up as well as #7 due to the oil and firing order. Take it as it is.
If buzz test was good so is the electrical side.
What CPS do you have and where was is sourced??
Air system in top notch shape from the not cracked air box (clean air) and fresh filter and CAC system pressure checked????
Outside conditions as well as truck temp?
Hard on the pedal when loaded, granny driven (fuel conscience)... maybe excessive carbon build up?
Injector cup clean and dry when doing install?
Pinched O Ring??? They were changed as well as the coper crush washer with OEM from the Ford counter I hope.
How much have you driven the truck since the swap?
What are you using to pull codes and run tests??? FORScan is the standard.
Things to think about.
If buzz test was good so is the electrical side.
What CPS do you have and where was is sourced??
Air system in top notch shape from the not cracked air box (clean air) and fresh filter and CAC system pressure checked????
Outside conditions as well as truck temp?
Hard on the pedal when loaded, granny driven (fuel conscience)... maybe excessive carbon build up?
Injector cup clean and dry when doing install?
Pinched O Ring??? They were changed as well as the coper crush washer with OEM from the Ford counter I hope.
How much have you driven the truck since the swap?
What are you using to pull codes and run tests??? FORScan is the standard.
Things to think about.
Cargo Master
Joined: Apr 2012
Posts: 2,024
Likes: 525
From: Bottom Of Pikes Peak
uh... you will get a lot of smoke and possibly odd behavior for a while until you drive it hard for a minimum of 25 miles. You have to get the air out of the system as well as residual fluids...which is accomplished from driving
Thread Starter
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4wd Low
Joined: Oct 2025
Posts: 11
Likes: 2
From: West Texas
I drove it about a mile after swap and didnt like that it was smoking. I mean lots of thick white smoke. I guess I need to pull them back out and swap copper crush washers and orings on it. My nephew is a mechanic at a shop and was saying I didnt need to swap the copper washers as they only have 6 months of use, but I have heard that they are one time use from you guys and another 7.3 guy. I think my nephew may be wrong. Can't say I am looking forward to doing this again but need my truck running right
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4wd Low
Joined: Oct 2025
Posts: 11
Likes: 2
From: West Texas
Update. Driver side injectors re-installed with new washers and orings. Still smoking the same as before. Should i drive it for a bit and see if it clears up, or go ahead and do the other side?...
* tried driving it up and down the street, maybe 2 miles later, engine stopped, cranks but wont start up
* tried driving it up and down the street, maybe 2 miles later, engine stopped, cranks but wont start up
Last edited by Greenpowerstroke; Oct 19, 2025 at 03:39 PM.
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GDSchafer
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