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Discussion Starter #1
has anyone encountered this problem? after i installed my kb tune i needed to change back to stock, and after reinstalling the kb tune back in i have a severe misfire / knock. after this i sent the sct back to kenne bell, they said everything was fine with the tune and even sent me a new sct. the car still sounds like a jackhammer but will not display a code. any ideas?
 

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Sounds like the timing is way off. I would keep after them for more help.
Agreed, id keep after them, and assure them the cars not running well, and your timing could deffinitely be off
 

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Discussion Starter #7
knock

thanks for the reply guys but the problems not the kb tune because the first time i loaded the tune it worked fine. its only when i returned it to stock then back to kb that it started knocking, i tried returning it to factory stock and the same thing happens. nothing like having a new kb on your car and not being able to drive it, especially when its nice and sunny here in southern nj. i tried to go onto the sct troubleshoot forum but it is saying that its down for updates since 11/28/07.
 

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Did you try disconnecting the battery for 15 minutes, and then starting from scratch again? I haven't done this myself, so I don't know if it holds any truth, but I've seen other guys saying that doing so resets things in the PCM.

It's worth a shot for what it takes to disco the battery for 15 minutes.
 

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Discussion Starter #11
knock

no, i just installed the stock tune and left the blower on just to see if it would idle regular which it did not. i also tried the reset the ecm thing with no luck. the problem must be with the ecm or the x cal.
 

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no, i just installed the stock tune and left the blower on just to see if it would idle regular which it did not. i also tried the reset the ecm thing with no luck. the problem must be with the ecm or the x cal.
How long did you run it this way?
 

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Discussion Starter #15
im pretty sure there are no vac leaks i was through with install and went back over everything a couple times after. to answer the other question i only ran the car for a couple seconds at idle a few times, im a diesel mechanic so im pretty auto inclined.
 

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Discussion Starter #16
oh, by the way my a/f meter is reading very lean which i think is caused by cylinders misfiring due to computer. keep in mind that the tune provided by kenne bell was running well at one point before i returned to stock and then back to kb. i fear that i might have to send the car to ford to get the ecu checked by the dealers computer. i already called ford parts for new ecm which costs $600+ alone not including the cost to have ford flash the new ecm.
 

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Discussion Starter #18
i just think this goes well beyond just a simple a/f problem, i contacted sct and they said it probably a stuck frame in the ecm, which is not changing paremeters in ecm when being tuned. sct says to take it to get a custom tune or to ford to check the ecm. not looking forward to the bill for that one.
 

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Discussion Starter #19
i gone and done it, i'm taking it to big daddys performance in lakewood nj for a custom tune and perhaps cams, not sure i have to talk to him about it. i'm tired of playing around with it and need professional help. thanks guys for all the advice you have given me i appreciate it.
 
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