2002 Possible Grounding Problem?
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2nd Gear
Joined: Jan 2023
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2002 Possible Grounding Problem?
What's the most likely cause of my 02 7.3 PS erratic surging/accelerating without changing any pressure on my fuel pedal and also once engines warmed up, it starts misfiring, jerking & cutting off for no apparent reason? I've been fighting it for almost a solid year to no avail! All new OEM sensors, checked & repaired wiring harness shorts, etc. all the most common culprits. Throws several erratic codes on high-end Snapon reader but check engine light rarely lights up? I watched recent YouTube video recommending checking main battery grounds and all other ground locations but wondered if this is common issue with other 7.3's & any grounding location diagrams anywhere? Thank you! Very Desperate
Fleet Mechanic
Joined: Jan 2023
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Here is a description of the ground locations.
https://charm.li/Ford%20Truck/2002/F...grams/Grounds/
https://charm.li/Ford%20Truck/2002/F...grams/Grounds/
Mountain Pass
Joined: May 2022
Posts: 212
Likes: 44
Battery connectors are a common failure. Easy check with an ohm meter.
My passenger side terminal failed. Wouldn't know just by looking at it. Ohm meter showed an issue though.
I wouldn't get misses, but my starter speed was low and i would get very intermittent stalls and pcm brown outs.
I reused the cables and put ends on them. Used military battery connectors and a very cheap crimper. Worked good and no more brown outs.
What codes you getting?
My passenger side terminal failed. Wouldn't know just by looking at it. Ohm meter showed an issue though.
I wouldn't get misses, but my starter speed was low and i would get very intermittent stalls and pcm brown outs.
I reused the cables and put ends on them. Used military battery connectors and a very cheap crimper. Worked good and no more brown outs.
What codes you getting?
FTE Leadership Emeritus
Joined: May 2014
Posts: 27,344
Likes: 5,941
From: Lake Hartwell, GA
What's the most likely cause of my 02 7.3 PS erratic surging/accelerating without changing any pressure on my fuel pedal and also once engines warmed up, it starts misfiring, jerking & cutting off for no apparent reason? I've been fighting it for almost a solid year to no avail! All new OEM sensors, checked & repaired wiring harness shorts, etc. all the most common culprits. Throws several erratic codes on high-end Snapon reader but check engine light rarely lights up? I watched recent YouTube video recommending checking main battery grounds and all other ground locations but wondered if this is common issue with other 7.3's & any grounding location diagrams anywhere? Thank you! Very Desperate
- Where are the sensors from?
- Did you replace the CPS when you swapped "all" sensors?
- What codes are you retrieving and are those AFTER you cleared the stored codes?
- How are you monitoring the "pressure on your fuel"?
- Do you have a scantool like FORScan so that you can see MFDES (Mass Fuel Desired) and TPS (Throttle Position Sensor)?
- I would start with the 42 pin connector and up to the UVCH's and testing those connections as I am not sure what you meant by "harness shorts".
- Wiggle the UVCH connectors with the engine running, see what you get.
- You can check the grounds if you like, start with the two on the engine block, then up by the driver side windshield wiper near the firewall.
- When it cuts out and stalls, do you lose 12v power to the instrument cluster or truck as a whole too is it engine only?
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