7.3 Running Rough
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4th Gear
Joined: Jan 2023
Posts: 4
Likes: 1
7.3 Running Rough
Hey guys, I own a 96 7.3 powerstroke. I bought it and it started smoking everywhere. Running awful. I have replaced the injectors, Icp, cps, valve cover and Harness. It sounds like it has an huge knock and when i rev it, it sounds like a bearing is playing ring around the rosey inside the block. Also Glowplugs have been replaced I know it won’t help but just to throw it out there. Any help would be awesome before I sell the turd lol.
Lead Driver
Joined: Apr 2016
Posts: 7,180
Likes: 1,336
From: Bahstun
All that work and you will have air in system that needs to clear out in about 100 miles of driving it.
sounds low on fuel pressure maybe, loose flywheel or an exhaust leak on manifold ( drivers side rear bolt missing on manifold?)
that roughness could be the harness on drivers side valve cover can get chaffed over the years
did you do a compression test?
can ohm it out with schematic here
https://www.ford-trucks.com/forums/1...load-test.html
sounds low on fuel pressure maybe, loose flywheel or an exhaust leak on manifold ( drivers side rear bolt missing on manifold?)
that roughness could be the harness on drivers side valve cover can get chaffed over the years
did you do a compression test?
can ohm it out with schematic here
https://www.ford-trucks.com/forums/1...load-test.html
Thread Starter
|
4th Gear
Joined: Jan 2023
Posts: 4
Likes: 1
All that work and you will have air in system that needs to clear out in about 100 miles of driving it.
sounds low on fuel pressure maybe, loose flywheel or an exhaust leak on manifold ( drivers side rear bolt missing on manifold?)
that roughness could be the harness on drivers side valve cover can get chaffed over the years
did you do a compression test?
can ohm it out with schematic here
https://www.ford-trucks.com/forums/1...load-test.html
sounds low on fuel pressure maybe, loose flywheel or an exhaust leak on manifold ( drivers side rear bolt missing on manifold?)
that roughness could be the harness on drivers side valve cover can get chaffed over the years
did you do a compression test?
can ohm it out with schematic here
https://www.ford-trucks.com/forums/1...load-test.html
Laughing Gas
Joined: Sep 2019
Posts: 797
Likes: 357
From: Arkansas
Did you crank it by hand after the injectors were done? When you yank the injectors the cylinders fill with oil. You need to leave the glow plugs out and turn it over by hand to clear the oil so you dont hydro lock. Some people leave the GP out and put the valve covers on loosely and bump it over. If you didnt do that and you didnt bend a rod shes gonna smoke like mad. Like the previous poster said there is a ton of air in the high pressure oil system after all that work. It will take time to work it out and idling wont cut it it will purge some but it needs to be driven. Was there a bunch of blow by before all this went down?
Thread Starter
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4th Gear
Joined: Jan 2023
Posts: 4
Likes: 1
Did you crank it by hand after the injectors were done? When you yank the injectors the cylinders fill with oil. You need to leave the glow plugs out and turn it over by hand to clear the oil so you dont hydro lock. Some people leave the GP out and put the valve covers on loosely and bump it over. If you didnt do that and you didnt bend a rod shes gonna smoke like mad. Like the previous poster said there is a ton of air in the high pressure oil system after all that work. It will take time to work it out and idling wont cut it it will purge some but it needs to be driven. Was there a bunch of blow by before all this went down?
Thread Starter
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4th Gear
Joined: Jan 2023
Posts: 4
Likes: 1
I’ll try it out. Thankyou
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Lead Driver
Joined: Mar 2006
Posts: 5,098
Likes: 1,504
From: western SD
The smoke could be from some oil blowing into the exhaust from the ejector swap, and burning from the exhaust heat. I should clear up in a few miles.
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Lead Driver
Joined: Apr 2016
Posts: 7,180
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From: Bahstun
if oil in the down pipe like mine was (i removed the rear injectors first LOL) when i hauled my camper for first time and EGT hit 1200, there was a huge cloud behind me for a couple miles and clear up after. I was getting nervous at that point of maiden voyage
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