Has this EVER happend before????HELP
01-29-2009, 05:34 PM
#24
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Maybe we altered something while installing the master? I just went out and took a quick look but didnt see anything loose or out of place but I'm going to take a closer look tomorrow night and see what I can find. What master did you go with?
01-30-2009, 11:48 PM
#25
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Just took a good long look at it and everything is fine. I did a lot of searching on here and I think the crank position sensor might have something to do with it. If you have replaced or tuned your pcm recently it needs to do a CKP relearn. I've read that it shouldnt cause a missfire however I'm not positive and the details are still kinda fuzzy to me but it was also said that having a rev limiter set higher than stock will cause problems with the CKP relearn procedure, and in my case the only time it cuts out is when I shift above where the stock limiter was at. I don't know how all this ties in together but it's looking more and more like the CKP is the culprit. Hopefully someone with more knowledge on this will chime in.
01-31-2009, 06:40 PM
#27
My friend had an I6 Trailblazer that he had tuned and he had to do the CKP. It was an auto... and an I6... so I don't know if it has any relevance, BUT I do know you can have any GM dealer do it for not too much.
Try seeing if setting the rev limiter back to stock fixes it, if so, there's you're problem. I could understand if the position sensor only works to a certain limit and by passing up 6xxxRPMs (or whatever) it kinda loses track of where the crank is. There again it would throw a CKP-based code... I could debate with myself all day. Hope you find it out!
Kyle
Try seeing if setting the rev limiter back to stock fixes it, if so, there's you're problem. I could understand if the position sensor only works to a certain limit and by passing up 6xxxRPMs (or whatever) it kinda loses track of where the crank is. There again it would throw a CKP-based code... I could debate with myself all day. Hope you find it out!
Kyle
01-31-2009, 07:52 PM
#28
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My friend had an I6 Trailblazer that he had tuned and he had to do the CKP. It was an auto... and an I6... so I don't know if it has any relevance, BUT I do know you can have any GM dealer do it for not too much.
Try seeing if setting the rev limiter back to stock fixes it, if so, there's you're problem. I could understand if the position sensor only works to a certain limit and by passing up 6xxxRPMs (or whatever) it kinda loses track of where the crank is. There again it would throw a CKP-based code... I could debate with myself all day. Hope you find it out!
Kyle
Try seeing if setting the rev limiter back to stock fixes it, if so, there's you're problem. I could understand if the position sensor only works to a certain limit and by passing up 6xxxRPMs (or whatever) it kinda loses track of where the crank is. There again it would throw a CKP-based code... I could debate with myself all day. Hope you find it out!
Kyle
02-02-2009, 09:15 AM
#31
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If that were the case we would notice the loss without shifting, and my dyno graph has no significant drop at all. The problem is in fact a random missfire only after a very fast shift above ~6000 I just dont know whats causing it yet.
02-02-2009, 10:17 PM
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Did a quick search on torque management and found this >>> https://ls1tech.com/forums/pcm-diagn...nagment+torque
Does fit some of the characteristics...
Does fit some of the characteristics...