7.3 really slow when cold
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1st Gear
Joined: May 2024
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7.3 really slow when cold
Hi all. My truck has recently seemed to be really slow until warmed up. Once warmed up it’s real zippy. I know that this is somewhat normal on these trucks but it seems like this is too excessive. It’s a 7.3 zf5 with 250k on it and it’s never really been this bad before. I have an international thermostat to put in it so I think I’m going to do that this weekend but I wanted to get other suggestions before I dive into it. Truck has a pacbrake on it that replaces the Ebpv and I’m thinking that might be something to do with it. Thanks y’all
Laughing Gas
Joined: Jan 2016
Posts: 910
Likes: 96
From: Fl.
I do not know anything about how the pacbrake works but I would wire the EBPV open and see what happens. The thermostat will not solve this. If wiring it open fixes the problem you will know for sure where to look for the permanent fix.
Hotshot
Joined: Dec 2012
Posts: 11,271
Likes: 1,654
From: Las Cruces New Mexico
When was the last time you did an oil change? Old oil thickens up and causes worn out injectors to not fire until warm due to the armature being to tight due to wear.
Signs of lazy injectors, might be time for new/reman injectors, but check that Packbrake and see if it's not closing when cold.
Signs of lazy injectors, might be time for new/reman injectors, but check that Packbrake and see if it's not closing when cold.
Lead Driver
Joined: Apr 2016
Posts: 7,201
Likes: 1,340
From: Bahstun
300k on mine
once it starts up on GPs only, I let it run for 20-30 seconds, one minute after driving it down the road, it runs well as the engine is putting out heat even when 30 out.
my EBPV closes on its own even with wires removed!!
mine is wired open for past few years and no more issues with lack of power in the morning
once it starts up on GPs only, I let it run for 20-30 seconds, one minute after driving it down the road, it runs well as the engine is putting out heat even when 30 out.
my EBPV closes on its own even with wires removed!!
mine is wired open for past few years and no more issues with lack of power in the morning
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usmchgb79
1999 - 2003 7.3L Power Stroke Diesel
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Dec 28, 2010 07:45 PM
