Hello,
I have a 2005 F-150 with the 5.4 3v. It has roughly 35000 miles on it. Today on the way home it started running terrible. Idle terrible, hesitation, something really wrong. I do have an Edge tuner that I have been running on level 1 (trans only), so I pulled the DTC Codes and it read (P0175 Bank 4 running Rich) and then gave me two others that said cylinder 5 misfire and cylinder 7 misfire. It did have a 4th, but I cant remember what it said. I tried re-flashing back to stock and now it lost the codes.

Any help will be greatly appreciated.

Thanks,
Devildog101

 

DD,

A misfire can cause a ghost Rich DTC because of the unburned fuel in the exhaust. The problem would most likely be more related to the misfire and would start looking at things like coils and plugs.

After reflashing back to stock, did the misfire go away or is it still present?

 

It is still present. I did a search, and I think it might have something to do with the injector warranty.

Am I screwed because I had a tuner?

 

No, you're not screwed. The programmer did not cause the injector(s) to fail. Leave the tune at stock and remove the Edge and it's cable from your vehicle.

Then, if it really is an injector problem, you need to get it to the dealer ASAP. Running it with a malfunctioning injector can cause some pretty serious damage. Supposedly, Ford will cover this "collateral" damage, but I would not test them on this.

- Jack

 

The only thing that scares me is that when I searched, I found that FX4LIFE and Stealth had the same problems. I also read were FX4LIFE's got denied because they said he had a "programmer". Stealth looked like he got his taken card of. They said something about something being left in the PCM after the truck was re-flashed back to stock, letting the dealership know there was a tuner.

 

This has been brought up before. Bill Cohron has said that if a dealer REALLY wants to look for it (and has the equipment), there is something, possibly a bit value in the PCM, that will tell them it has been programmed more than what might have been authorized at the dealership. So, if they thought the condition was caused by a PCM problem, and if correcting the PCM problem fixed the vehicle, then yes, I'd say you'd have to pay for the repair.

But, if the problem really is faulty injector(s), I'd think they'd have a hard time making a case that it was caused by the PCM. An injector is really just a valve, that opens to let fuel spray in. It's a mechanical device, that is controlled electrically. The injector problem we've been notified of is in the injectors themselves.

However, don't forget that Bill suggested it COULD be the coils or the plugs. I'd actually be a bit surprised if it was a plug, at only 35,000 miles, but the COPs are somewhat likely suspects.

- Jack

 

Well, the truck was towed to the dealership today. Wish me luck. I was wondering about the DTC that is present when you flash the truck back to stock. I think it says drive cycle incomplete. I know what it means, but would that be a tell tale sign that I had a tuner?

I understand that Ford should not think that the tuner had anything to do with my problem, but I saw were FX4Life's dealership did. I guess it is just a crapshoot.

Thanks for all of your help, and I will be sure to keep you posted.

Devildog101

 

I think you'd get the same code if you disconnected the battery. Tell them someone told you to disconnect the battery to reset the computer to see if that would correct the problem.

 

Well, good news is Ford either didnt care about my Edge, or they didnt find out. Either way, they fixed the truck (well sort of). It turned out to be the #7 injector/plug. When I pulled up the DTC's on my Edge, it said that #5 and #7 were misfirring, but Ford said that when the ran it only #7 was. Then tried just replacing the injector and it ran terrible because the plug was fouled out I guess. Then they went back in and changed the plug.

I told the service guy that when I scanned it, it stated #5 and #7, he said no. We will see.

Ford was real quick to get it fixed and everything was covered under the extended injector warranty.

Thank you to all that provided input/help. It is greatly appreciated.

We will stay tuned for #5, hopefully nothing goes wrong.

Later,
Devildog101

 

And, Devildog (and anyone else that cares), you WILL get the "drive cycle" P1000 code anytime you change tunes, or, disconnect the battery, just as Windsor said. A drive cycle code is not really a red flag to a dealer. But, it will cause you to fail an emissions inspection, so DO NOT change the tune prior to having that test.

Glad your problem seems to be handled properly at the dealership.

- Jack