Stalling at high speed
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Joined: Aug 2019
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Stalling at high speed
I have an 03 6.0 dually I have a problem with the stalling under a load. It runs great until I reach 70 mph and hit over 2k rpm. Then the pedal seems to lag and sometimes goes dead. I replaced both fuel filters and not much better result. If I stop the truck an put in park rev it up the lag goes away and won’t come back till truck hits over 70 mph and over 2k rpm. Any ideas? Thank you in advance. I’ve read these forums for help and have seen great info so I joined today to see if there is any advice.
More Turbo
Joined: Apr 2007
Posts: 695
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From: Almost Heaven
Welcome 
Need some more truck info if you got it, and did you use motorcraft filters? Can you get us some DTC's and PID readings? I use FORScan (free for windows and $7 for a smartphone) and a BAFX wifi obdii adapter ($27).
Need some more truck info if you got it, and did you use motorcraft filters? Can you get us some DTC's and PID readings? I use FORScan (free for windows and $7 for a smartphone) and a BAFX wifi obdii adapter ($27).
More Turbo
Joined: Apr 2007
Posts: 695
Likes: 78
From: Almost Heaven
- any modifications or all stock
- look over the engine very closely, any broken or chafed wires, are the cac boots oily or torn, anything not looking right
- when the pedal goes limp are you gradually running up to 70 mph or are you wot
- any maintenance performed, you should use motorcraft or racor filters in your truck
- any fuel, oil or air leaks
- too much info is better than not enough
- do you have a motorcraft oil filter and oem cap
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Joined: Aug 2019
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The visual inspection of the motor and wiring doesn’t turn up anything suspicious. The truck is stock tuned. Other than a few bulletproof upgrades. The HPOP headbolts ficm, ipr valve and the icon are all under a year old. Just replaced the egr valve a few days ago. It has its regular maintenance oil changes filter changes, air and fuel too. The truck doesn’t seem to care how you get to the 70 mph 2k rpm mark. You can mash the gas and get there quickly or gradually get there, the results are the same.you can go past 2k rpm while under load just not after 70 mph. No tuner no visible oil leaks. Oil lvl stays constant.I removed my bed to make accessing underneath easier. Fuel pressure at idle is 48 I have not tested it yet under load.
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Laughing Gas
Joined: Dec 2010
Posts: 1,155
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From: Las vegas nevada
I had same issue static 50 and under wot sucked to 0 just like that..... did blue spring up grade never dropped under 60 or so at wot... just a thought
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