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Mustang Forums
2011-2014 Mustangs
Engine/Tuning
Running like crap after tuner update!
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<blockquote data-quote="Classicinjection" data-source="post: 16484491" data-attributes="member: 198358"><p>crjackson yep did the crank relearn , it was a little nerve racking holding the fresh engine at 3200rpm then it started getting hot... I ended up buying one of those vacuum filling attachments for the coolant I've never had such a problem burping a car before. Next try the relearn worked.</p><p> The car is still the dealer, they called the other morning and said there are some TSB they want to check on in regards to the crank sensor, I said yeah I told you about those the day I dropped it off, then he started getting rude. Tried to tell me the 91 octane tune was still on the car even though i returned it to stock. The tune in question had the idle set higher then stock which would have been pretty noticeable, if it would run right at all with the stock box instead of the JLT CAI. </p><p> From what I've read about the diagnostic system Ford has it seems that this should have been a easy fix, I guess not. Either the spark is falling off at higher rpms or the fuel is and since its limited to just 1 cylinder and same thing happened on 2 different engines to me it has to be the ECU or a wiring harness issue.</p></blockquote><p></p>
[QUOTE="Classicinjection, post: 16484491, member: 198358"] crjackson yep did the crank relearn , it was a little nerve racking holding the fresh engine at 3200rpm then it started getting hot... I ended up buying one of those vacuum filling attachments for the coolant I've never had such a problem burping a car before. Next try the relearn worked. The car is still the dealer, they called the other morning and said there are some TSB they want to check on in regards to the crank sensor, I said yeah I told you about those the day I dropped it off, then he started getting rude. Tried to tell me the 91 octane tune was still on the car even though i returned it to stock. The tune in question had the idle set higher then stock which would have been pretty noticeable, if it would run right at all with the stock box instead of the JLT CAI. From what I've read about the diagnostic system Ford has it seems that this should have been a easy fix, I guess not. Either the spark is falling off at higher rpms or the fuel is and since its limited to just 1 cylinder and same thing happened on 2 different engines to me it has to be the ECU or a wiring harness issue. [/QUOTE]
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2011-2014 Mustangs
Engine/Tuning
Running like crap after tuner update!
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