Anyone have any ideas on this problem? FINALLY SOLVED

[sk47]

The gen3 measures fuel pressure and compensates by altering injector pulsewidth. The gen3 will run perfectly fine in a very large range of fuel pressures.

Hello; Good to know. Kills off my recent speculation. fuel pressure high should not be an issue.

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[Mike Pfeifer]

Is the car switching between open and closed loop?

 

[Leigh_bullitt]

Is the car switching between open and closed loop?

It’s almost that kind of sensation but it’s definitely closed loop when warmed up.

happened today cold started and drove the car for about an hour through traffic and it was jerking slightly and didn’t feel happy. It’s slight that a dealer would not consider it a problem.

left the car for an hour and it felt like a different car. So smooth in traffic.

I do also notice that the power is reduced slightly because the traction control won’t come for wheel spinning when rough but when it’s fine I can spin it in 3rd gear. Also the low end torque seems to be less when rough.

this has baffled me for sooooo long now.

I pretty much done everything except…

change the coil Packs
Change the fuel pump
Everything has been checked.

fuel trims look good as well although long term trims report 0,92 which I’m guessing is -8% so it’s definitely running rich. Or actually could be lean because the lambdas are at 1.04 and Stfts are compensating.

 

[Leigh_bullitt]

There was a guy on these forums with exactly the same issue as me and he had a 2020 Bullitt as well. He didn’t notice so much the power issues but stated that the exhaust tone changed and sounded boomy or trumpety and then would go back to normal after it being left.
Tried to contact him but he never came back.

 

[sk47]

Hello; I am pretty much out of ideas. Just as well since I do not have relevant experience. I do have a thought. From what I can determine there is an annoying problem with the OP's car. A self-correcting issue of some sort.
Correct me if I am wrong but what i gather is the OP is using a tuner to run checks on the various sensors. Not using outside volt-ohm meters or other testers. Could there be a problem with this approach? If there is a fault within the systems of the car's electronics, does it follow to trust those electronics to give valid information?
I will continue to follow the thread but do not have new ideas.

 

[Leigh_bullitt]

Hi
It finally looks like this problem is actually tune related.
reverted back to stock, did a KAM reset and a crank re learn.

firstly noticed the engine noise was quieter and the VCTs weren’t rattling anymore which I’m guessing is adjusted in the tune.

feels less powerful in stock form but the low rpm drivability seems good again.

I’m guessing it’s the tune.
Think I’ll get a new tune….

is AED any good ???

 

[ORRadtech]

I'm not rereading this whole thread. But early on you said it did it tuned or stock. And now you're saying it's fine stock?
I guess you can try a new tune but it feels like a parts cannon move.
Who did your current tune? From reading this forum Weingard seems very respected.

 

[Leigh_bullitt]

Cheers
Yeh I did return it to stock before but didn’t notice much of a difference but returning to stock this time and cold starting I can immediately notice that vcts aren’t rattling anymore like they do with the tune.
also surging has gone as the throttle seems less touchy in stock.

 

[cerbomark]

we questioned the tune first.

 

[Leigh_bullitt]

Yeh it’s weird cause the first time it went back to stock it still felt strange.
however this time I did with the engine cold and performed a KAM reset and crank relearn.
the VCTS are definitely not making noise any more which used to happen on cold start up and reving to around 2k rpm.

 

[sk47]

But early on you said it did it tuned or stock. And now you're saying it's fine stock?

From reading this forum Weingard seems very respected.

we questioned the tune first.

however this time I did with the engine cold and performed a KAM reset and crank relearn.
the VCTS are definitely not making noise any more which used to happen on cold start up and reving to around 2k rpm.

Hello; Is there a reason you need to have a tune? I get such is the modern equivalent of what was done back in the analogue age. I also follow that tunes are a popular thing to do.

Now that the car appears to be running better with a stock tune perhaps run it that way for a while??? There are many threads of nightmare problems posted by owners that have been traced back to tunes. Such is one reason I check to see if a used Mustang has a tune on it and avoid the car if it does.
Perhaps run it stock a while to make sure everything is sound before getting a different tune. While I have not done a search, I do recall Weingard getting good reviews.

Good luck

 

[sk47]

Mechanic Thinks That There’s Something Wrong With Ford’s Current Engines

Hello; First thing is i get this story is about EcoBoost cam phasers so may not apply at all to a v8. Just rang a bell as you have mentioned cam phasers rattling when things go wrong.

 

[Leigh_bullitt]

Yeh there has been forums everywhere about the vct phaser rattle.

I told my tuner and he says it’s impossible but it’s clear as day. With the tune the solenoids are clicking away for the first 30 seconds and then stop. Without the tune they are silent.

I have datalogged the VCTs and nothing seems to change between stock or tuned so I’m guessing it’s something to do with oil pressure.

 

[skinnyb]

Makes you wonder. I had mine tuned recently and my phasers rattle a bit louder since the tune. Nothing crazy but it is noticeable. However I have no driveability issues. I guess something was done to them to make extra power.... I plan on changing do a different oil next oil change, will see if that helps...

 

[ice445]

Makes you wonder. I had mine tuned recently and my phasers rattle a bit louder since the tune. Nothing crazy but it is noticeable. However I have no driveability issues. I guess something was done to them to make extra power.... I plan on changing do a different oil next oil change, will see if that helps...

I had that with the FP tune, my current theory is that it's a result of the high pressure pump being used more (gdi is great knock prevention and control) and the cams switching earlier at lower rpm for more torque. All of that load on the timing set at low rpm when the oil bypass is still open means the phasers struggle to lock until oil pressure comes up.

I suspect it's somewhat common, but I imagine it's quite abusive to the phasers and chain/guides over time even if it doesn't directly cause any issues. Not sure why some cars do it and some don't though.

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