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Lately I have had this problem that my F150 2015 3.5 ecoboost does not go over 80 mph. Every thing seems to work good. I had code U0100-lost comunication with ECM/PCM. I cleared code, It didnt come back on, but didnt fix my problem.
Its not the my key problem, I have that disabled already. Its just as if its governed. No message when It gets close to 80. I dont know exactly when it started, because I dont drive that fast often. I did have my diffrential bearings replaced. Its after that that I noticed first time. Help appreciated!
You have no actionable fault to point to but the speed limiting you think you have with no codes.
A look at your history with the cat converters faults, they may be restricting the exhaust flow to the point the engine cannot pass exhaust fast enough on a Turbo engine. Said another way, the engine cannot breathe well enough at higher RPM.
The air ingested has to get out of the engine as exhaust. If restricted to much the motor will be limited in RPM and power.
An exhaust back pressure test would tell you if this might be the problem.
That's all I can make out of your concern.
Things have to be repaired and not left go or the truck begins to lay down on you, eventually.
Good luck.
Last edited by Bluegrass; Oct 21, 2022 at 03:13 AM.
You have no actionable fault to point to but the speed limiting you think you have with no codes.
A look at your history with the cat converters faults, they may be restricting the exhaust flow to the point the engine cannot pass exhaust fast enough on a Turbo engine. Said another way, the engine cannot breathe well enough at higher RPM.
The air ingested has to get out of the engine as exhaust. If restricted to much the motor will be limited in RPM and power.
An exhaust back pressure test would tell you if this might be the problem.
That's all I can make out of your concern.
Things have to be repaired and not left go or the truck begins to lay down on you, eventually.
Good luck.
I'll look into that, because I do have problems with one cat converter. I thought it just didnt convert any more, so it might be closed up afterall.
You have no actionable fault to point to but the speed limiting you think you have with no codes.
A look at your history with the cat converters faults, they may be restricting the exhaust flow to the point the engine cannot pass exhaust fast enough on a Turbo engine. Said another way, the engine cannot breathe well enough at higher RPM.
The air ingested has to get out of the engine as exhaust. If restricted to much the motor will be limited in RPM and power.
An exhaust back pressure test would tell you if this might be the problem.
That's all I can make out of your concern.
Things have to be repaired and not left go or the truck begins to lay down on you, eventually.
Good luck.
I did the exhaust back pressure test, I took out the sensor between turbo and cat, tested the preasure there. It stayed very close to zero psi at 3,000 rpm. So it seams like the problem is something else
There was a case a few years ago where there was a problem with the way the air intake was fastened down to the radiator support. At higher flow rates the front of the intake would close up pinching off the air flow. Worth a look.
There was a case a few years ago where there was a problem with the way the air intake was fastened down to the radiator support. At higher flow rates the front of the intake would close up pinching off the air flow. Worth a look.
looks alright to me
Last edited by standueck; Oct 22, 2022 at 01:48 PM.
I did the Key on Engine running on demand self test, with forscan. These are the results
Key On On Engine Running On Demand Self-Test has been started[16:03:44.846] Test completed successfully, no errors foundStill limited to 80mph, I don't know but seems like the truck governed itself to 80 with no reason...
Last edited by standueck; Oct 22, 2022 at 07:20 PM.
What is your RPM @80mph in top gear? Try running up to or over that RPM in a lower gear. If it goes over I would think that something is limiting speed, not RPM. Just a thought.
The code highlighted in the photo is for an external USB cable and port fault.
Note it says no Card or interface, hence no CEL set since it is not engine or system related due to outside issue.
What is your RPM @80mph in top gear? Try running up to or over that RPM in a lower gear. If it goes over I would think that something is limiting speed, not RPM. Just a thought.
At 80mph the RPM are at 2,000. I can rev it up higher no problem. Engine is running good. Its a speed limit set to 80. I just dont know how to get rid of it yet. Yesterday I drove over 400miles, everything works good, just limited to 80mph.
I'm starting to think it has to do with My Key afterall. I have only one key. I had played around with It and activated the 80mph speed limit with my key. I disabled My Key feature with forscan. Had no problems for a few weeks. Now its limited, but with no message. I saw a video on youtube where somebody said, sometimes after disabling My Key feature, the volume restriction, had not been fixed with that. So I'm thinking on my truck its the speed limiter that dosen't want to go away even with disabling My Key feature. But I'm new to forscan, maybe I missed something while disabling My Key.
U0100
