Lost

[tadams11201]

lllll

[tadams11201]

One additional item, under idle conditions, it will idle great and rev quickly.

[JWBFX4]

Originally Posted by tadams11201

It is not throwing any codes ande being as it runs like it should stock WITH the performance setting, I would assume that it isn't a misfire. Please help.. cannot find anything on the web related to this. 2005 f150 5.4l

I might just be having an off morning but what does stock with performance settings mean??

All the things I had thought of looks like its been done....cats, O2's....Dont really know what else to suggest.

[cleatus12r]

Have them attach a fuel pressure gauge to the fuel rail and watch fuel pressure under acceleration.

Also, have them check for a plugged catalytic converter. Easy to do by watching the MAF sensor data.

This sounds just like a lack of airflow or a severe lean condition.

[tadams11201]

I was trying to ellaborate that when it is using the performance setting, it runs like it used to in stock mode. That is the only way it will run half decent. They had told me that they checked the injectors but will have another dealership check the pressure and injectors after the fabrications they told me before. Also, they replaced the cats when they replaced the cam phasers..I hope that they are not bad again. I tend to agree with the lean issue. I will post an update after next week when I can get them to check it. Thanks for the input. Oh BTW, when it first starts, it runs great for about half mile to mile then falls flat.

[Longshot270]

Well maybe it has to do with the sensors that activate at higher temperatures like the O2. I can't think of any sensors that would at the moment but maybe someone else will.

[Jackpine]

That DOES sound a bit like O2 sensors giving incorrect information after they've reached operating temperature, doesn't it?

I'd certainly try a different dealer.

Please complete the information in your User Profile too, to help Bill. You need to add your HEX code, the Gryphon model number and Serial Number. This DOES NOT sound like a Gryphon issue, of course, but that information could be useful someday.

- Jack