06SilverBullet Posted September 3, 2014 Share Posted September 3, 2014 Was out tuning last night and keep getting an intermittent problem. shifting manually in sport mode in third and fourth gear right around 5500rpms I get a knock. when in full auto mode this does not happen. Was wondering if anyone has had this problem or some insight. Also for starters, it did it even when we pull timing so its not an actual spark knock. something is causing it. The main reason I am leaning toward the tranny is it only does it while manual shifting. Link to comment Share on other sites More sharing options...
MrTris Posted September 4, 2014 Share Posted September 4, 2014 If you see the knock go up on knock sum, it's probably phantom knock, native to 5EATs. If it's on FBKC, or FLKC, then, it only still might be worth checking out. How much timing is being pulled by the ECU? How much are you pulling and how? Link to comment Share on other sites More sharing options...
chimera Posted September 9, 2014 Share Posted September 9, 2014 yup, had EXACT same issue (only if manual shifting). it is NOT the trans (in fact, had a mate have exactly the same issue in his manual through an entirely different tuner) I had the issue (over a period of 3 months, testing everything possible) when tuning with dave @ cryo. We basically started the tune again and Dave "tuned it out" slowly but carefully. He maybe able to pipe up and add what he thinks the issue may have been (although because we just bit the bullet and started again, we may never know) oh and here's the thread you want to read... http://legacygt.com/forums/showthread.php/stumble-stutter-thread-182559.html Link to comment Share on other sites More sharing options...
06SilverBullet Posted September 11, 2014 Author Share Posted September 11, 2014 MrTris- not sure how much timing but i know we took more than the factory map takes and still getting it so I know its actually phantom knock. Not sure if I can go up on knock sum as I am only tuning with open source. Its just seemed like a trans thing as it only does it when manually shifting. 3rd and fourth gear only as well. I suppose we could go back to square 1. I would say I only have a light stage 1 tune. Link to comment Share on other sites More sharing options...
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