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Mustang Forums
2011-2014 Mustangs
Engine/Tuning
2013 5.0 GT will not reset O2/Catalyst Emission Monitors
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<blockquote data-quote="DD2000GT" data-source="post: 15365013" data-attributes="member: 4538"><p>Since I did not get any hits on my post, I decided to take it back to the dealer since a few more "by the book" Ford drive cycles did not resolve the issue. He did ask when I dropped it off if it had a tune and I told him "I" did not put a tune on it, but it was a certified pre-owned vehicle we purchased from them about a year ago and I "assumed" they verified the stock tune was in place... I got a call the next day saying it is ready to pick up. I asked what they did and was told "the tech just drove it for 10 minutes and all monitors changed to ready". I told the service adviser right then that did not sound right as I have driven the drive cycles for over a month and about 1k miles.</p><p></p><p>I picked up the car and checked the monitors with my OBD scanner - sure enough, they were all ready. Started to take off and it was all I could do to feather the clutch to keep it from bucking. Hmmmm. Got on the highway and it felt like I was towing a 10k lb. trailer behind me (low on power), also at a steady RPM I could feel the engine surging constantly. Coming up on a car I lifted my foot from the accelerator pedal expecting it to engine brake and slow down as normal, and the RPMs stayed high like the accelerator pedal was stuck - I almost hit the back of the car before I hit my brakes. At my exit at a stop light, the idle was hunting all around and almost died on me on one stumble. Something was not right. It almost feels like I need to run an idle and PCM relearn(?)</p><p></p><p>I called the dealer back this morning and told the service adviser about the changes, and I was pretty sure the PCM had been reflashed. I told him I did not care, but as the owner I needed to know this info, and if he would please go back and talk to the tech and verify. No return call...</p><p></p><p>Anyway, I 'think" my used GT had an aftermarket tune and that is why the monitors would not ready. Sucks too, because the "old" GT ran a hell of a lot better than what I an seeing now! But, at least it is inspected now.</p></blockquote><p></p>
[QUOTE="DD2000GT, post: 15365013, member: 4538"] Since I did not get any hits on my post, I decided to take it back to the dealer since a few more "by the book" Ford drive cycles did not resolve the issue. He did ask when I dropped it off if it had a tune and I told him "I" did not put a tune on it, but it was a certified pre-owned vehicle we purchased from them about a year ago and I "assumed" they verified the stock tune was in place... I got a call the next day saying it is ready to pick up. I asked what they did and was told "the tech just drove it for 10 minutes and all monitors changed to ready". I told the service adviser right then that did not sound right as I have driven the drive cycles for over a month and about 1k miles. I picked up the car and checked the monitors with my OBD scanner - sure enough, they were all ready. Started to take off and it was all I could do to feather the clutch to keep it from bucking. Hmmmm. Got on the highway and it felt like I was towing a 10k lb. trailer behind me (low on power), also at a steady RPM I could feel the engine surging constantly. Coming up on a car I lifted my foot from the accelerator pedal expecting it to engine brake and slow down as normal, and the RPMs stayed high like the accelerator pedal was stuck - I almost hit the back of the car before I hit my brakes. At my exit at a stop light, the idle was hunting all around and almost died on me on one stumble. Something was not right. It almost feels like I need to run an idle and PCM relearn(?) I called the dealer back this morning and told the service adviser about the changes, and I was pretty sure the PCM had been reflashed. I told him I did not care, but as the owner I needed to know this info, and if he would please go back and talk to the tech and verify. No return call... Anyway, I 'think" my used GT had an aftermarket tune and that is why the monitors would not ready. Sucks too, because the "old" GT ran a hell of a lot better than what I an seeing now! But, at least it is inspected now. [/QUOTE]
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2013 5.0 GT will not reset O2/Catalyst Emission Monitors
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