Big Cam needs help with Tuning!!!
12-21-2003, 05:28 PM
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Big Cam needs help with Tuning!!! Ok, I used to run a TR224 @ 114 cam, swapped out for a TSP231/237 @ 112 cam. It would idle, barely, and stall often. I finally got my Edit cable, turned the idle up to 1000 cold, 900 warm, and adjusted the RAF, IAC, as well as VE <400 @ 60%, <800 @ 80% and then <1200 @ 90%. Added timing to the idle rpms in gear and park. Before tuning AND after, I have a hesitation, or something like it, around 2500-3500rpms under Part Throttle take offs. The trans will immediately go into 2nd gear and then act like a its slipping a clutch or something, but the RPMs do not raise, or ver very slowly, as does the mph. It is intermitten, so I cant just go out and give it PT and make it happen everytime, or at elast I cant seems to duplicate ALL the exact sequences of events to make it happen on demand. WicketMike has the same problem, but he ends up getting a P0120 or some trasn slip code. And another user on a different board has similar problems. One was told that the cam doesnt pull enough vacuum, but I cant see that as it does this seemingly intermittent. Any help would be greatly appreciated.
FWIW-I have checked all sources of wiring, non loose, or d/c. I checked all grounds, although I havent d/c a ground wire yet while doing a cam swap. I also went thru and checked for vacuum leaks, none. And it did this before tuning, when it had the TR224 Predator tune, and it hasnt changed at all since tuning with LS1Edit.
TIA
Charlie.
FWIW-I have checked all sources of wiring, non loose, or d/c. I checked all grounds, although I havent d/c a ground wire yet while doing a cam swap. I also went thru and checked for vacuum leaks, none. And it did this before tuning, when it had the TR224 Predator tune, and it hasnt changed at all since tuning with LS1Edit.
TIA
Charlie.
12-21-2003, 11:27 PM
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Ok, lots of responses here as well. I surely cant be the first one to experience anything like this...can I? with my luck, I should know better.
Anyone????? I cannot think of what to adjust, it doesnt make any sense for the trans to jump into 2nd, and not want to downshift until the rpms finally reach around 3500? Its not vacuum modulated, unless theres a reference signal for the solenoids in the trans that comes from a vacumm attached from the PCM/MAP sensor? Its like in a reduced power mode or something.
Rambling........H E L P.
Anyone????? I cannot think of what to adjust, it doesnt make any sense for the trans to jump into 2nd, and not want to downshift until the rpms finally reach around 3500? Its not vacuum modulated, unless theres a reference signal for the solenoids in the trans that comes from a vacumm attached from the PCM/MAP sensor? Its like in a reduced power mode or something.
Rambling........H E L P.
12-22-2003, 11:19 PM
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Yes it does it cold. Also does it warm. Even does hot!
I dont get it. WicketMike and myself cant possibly be the only ones trying to do this by ourselves. can we? Maybe this is one of those "trade secrets" huh? Ughh.
But yeah, its like a deadspot, a hesitation, a lull, a I dont know WTF it is thingie.
Charlie
I dont get it. WicketMike and myself cant possibly be the only ones trying to do this by ourselves. can we? Maybe this is one of those "trade secrets" huh? Ughh.
But yeah, its like a deadspot, a hesitation, a lull, a I dont know WTF it is thingie.
Charlie
12-23-2003, 12:02 PM
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Try throwing a stock tune back in just to make sure that isn't the problem. You'll have to 2-foot it, and it will start like crap but there should be no hesitation when you get on the gas.
If the problem is still there, then I would start looking outside computer problems.
Good Luck
If the problem is still there, then I would start looking outside computer problems.
Good Luck
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12-23-2003, 12:44 PM
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Ok, heres my Problem with that, I dont have my stock tune..excpet the one inside my predator.
I had been using the diablo predator for tuning early this year, tuned for headers, then the TR224 cam, and then my friend added me to their cable. It did this with the TR224 Diablo tune. But can I just use the Predator to install stock tune? And then start over from there? I have tuned over two other cars predator tunes and have had no issues at all.
Thanks Kevin.
Charlie.
I had been using the diablo predator for tuning early this year, tuned for headers, then the TR224 cam, and then my friend added me to their cable. It did this with the TR224 Diablo tune. But can I just use the Predator to install stock tune? And then start over from there? I have tuned over two other cars predator tunes and have had no issues at all.
Thanks Kevin.
Charlie.
12-23-2003, 01:35 PM
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Ooooh.
It is never a good idea to mix LS1 edit an Predator / Hypertech tunes. I know some poeple have done it, but we have had some strange things happen (some tables remained unchanged after a reflash etc.... wierd stuff).
It is always best to return a PCM to stock before goofing with it with LS1 edit and vice versa.
It is never a good idea to mix LS1 edit an Predator / Hypertech tunes. I know some poeple have done it, but we have had some strange things happen (some tables remained unchanged after a reflash etc.... wierd stuff).
It is always best to return a PCM to stock before goofing with it with LS1 edit and vice versa.
12-23-2003, 04:46 PM
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Kevin, I have heard the same since, but not too much before this.... hindsight! Anyway. As I said, this problem was there before the Edit tuning, since the edit tuning and hasnt changed. So I could rule out VE=unless it needs to be multiplied by 180% or something. Rule out idle, it was low, now high and no difference. Rule out IAC same as Idle, and timing too.
I am stuck on this one fellas, thinking it has something to do with vacuum, just not sure what, how or where. The why is covered by size of cam vs "something" in the tune, hopefully.
I am stuck on this one fellas, thinking it has something to do with vacuum, just not sure what, how or where. The why is covered by size of cam vs "something" in the tune, hopefully.
12-24-2003, 12:29 PM
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mikey, yeah kinda.....the evil descreened MAF. Had it on for two years, never had any problems. Always had good LTFTs, trans everything. I guess maybe the descreened MAFcould finally mess with the new cam, woudl be weird since it didnt do it with old TR224 cam 
12-24-2003, 12:58 PM
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wheeeew. I was hoping that wouldnt be a problem. I didnt have to stones to port it when I first got the car...now I am glad I was reserved.
Any other ideas? Seems WicketMike has resolved the p0121 code by adjusting the table for it to set in v1.3 Just dont know if it is causing the deadspot. Anything else I can look at?
Any other ideas? Seems WicketMike has resolved the p0121 code by adjusting the table for it to set in v1.3 Just dont know if it is causing the deadspot. Anything else I can look at?
