7.3 is struggling
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Cross-Country
Joined: Nov 2011
Posts: 84
Likes: 0
7.3 is struggling
Could really use some help, lately my truck is struggling to get up to speed. She idles fine and no smoke, but when driving I can feel a vibration on the floor and the truck has a shudder.
Checked fuel presses and it was 45lb
Oil good and new up pipes. High pressure oil pump is about three years old.
Should I remove the valve covers and check the injector wiring harnesses?
The weird thing is some times she goes through the gears fine, still struggling once in third gear, but other times she will be slow to get through the gears. Either way once in third you can feel a loss of power.
Any help on what direction to look would be great.
Checked fuel presses and it was 45lb
Oil good and new up pipes. High pressure oil pump is about three years old.
Should I remove the valve covers and check the injector wiring harnesses?
The weird thing is some times she goes through the gears fine, still struggling once in third gear, but other times she will be slow to get through the gears. Either way once in third you can feel a loss of power.
Any help on what direction to look would be great.
Post Fiend
Joined: Dec 2009
Posts: 15,505
Likes: 18
From: Livoina,La
Stay away from the stealer-ship.
If you don't have a check engine light I wouldn't worry about the codes yet.
I'd pull the value covers and start checking the harness and if they look good check them again with a magnifying glass.
If you don't have a check engine light I wouldn't worry about the codes yet.
I'd pull the value covers and start checking the harness and if they look good check them again with a magnifying glass.
Logistics Pro
Joined: Oct 2008
Posts: 4,818
Likes: 1
From: Avilla, IN
If you have an android phone or tablet you can get the Torque Pro app. It'll check codes, and you can monitor sensors with it. It is a little tricky to use at first tough. But it'll cost you less than $20 to get set up to use it.
Fuel pressure seems a bit low, that might be half the problem. Idling fuel pressure should be 60-70 psi.
Check the UVCH as suggested.
How many miles are on the injectors?
Fuel pressure seems a bit low, that might be half the problem. Idling fuel pressure should be 60-70 psi.
Check the UVCH as suggested.
How many miles are on the injectors?
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Cross-Country
Joined: Nov 2011
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Truck has about 175k on the injectors.
Going to pull the valve covers this weekend.
Thanks for all the info.
Going to pull the valve covers this weekend.
Thanks for all the info.
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Laughing Gas
Joined: May 2012
Posts: 855
Likes: 5
From: Central Oregon
First check by simply unplugging the harness and visually inspect all 4 pigtails and then ohm out the valve covers if you don't see any melted ports
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Cross-Country
Joined: Nov 2011
Posts: 84
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I have to admit I'm not sure which uvwh was bad, I inspected all four and could not find any cracks or burn marks, but I figure they are almost twenty years old so I switched then with new ones and problem fixed.
I know I should have ohm them, but I don't have a meter.
I know I should have ohm them, but I don't have a meter.
Fleet Owner
Joined: Aug 2004
Posts: 20,419
Likes: 197
From: AZ
I had some burnt pins once and looked at it and didn't see anything. Got on here and said that they were OK. Someone said "LOOK AGAIN!!!!!!" LOL I got a magnifier glass out and sure enough, I had burnt pins.