PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

cold start tuning help

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Old Apr 14, 2005 | 12:35 PM
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Default cold start tuning help

Well i have my car up and running with a 90mm intake and throttle body and new true duals.When the car is warmed up the iac and idle is fine.The problem is when i start it when its cold i have to play with the throtte till its warmed up a little.What do i look for or change to cure this hard start problem.I have efi flashscan so tuning is not a problem.Thanks for any input.
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Old Apr 14, 2005 | 02:19 PM
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Have you reduced the first three columns of the ve table?
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Old Apr 14, 2005 | 03:52 PM
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No i didnt know were to tune for the cold start up.How do i go about doing this.How much do i pull out or put in as for fuel.
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Old Apr 14, 2005 | 06:18 PM
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Ok i reduced the first three rows but i don't know how much to go.I went 4% the first time and another 4% second time i don't know how much i should go.How much does i take with a pretty good size cam?
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Old Apr 15, 2005 | 01:58 AM
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What are your IAC counts when the car is fully warmed up?
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Old Apr 15, 2005 | 09:48 AM
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You might also want to check LTIT's and STIT's at lower engine coolant temp points. It may be as simple as adjusting your RAF table, inthe lower ECT columns.
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Old Apr 15, 2005 | 12:39 PM
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My iac count is between 20 and 50.When the car is warm its good just the cold start.What is the raf table ive been adjsting my ve table in the first three rows seems to be working i have taking out 12 percent so far and its better.How much can i take out before i have a problem.Will it effect any thing else.
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Old Apr 15, 2005 | 01:25 PM
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Originally Posted by tuff
Ok i reduced the first three rows but i don't know how much to go.I went 4% the first time and another 4% second time i don't know how much i should go.How much does i take with a pretty good size cam?
It takes quite a bit with a good sized cam. With my cam, I think I went 50%, 60%, 70%, 80%. Note that I did the first four columns, not just the first three. That's another thing you have to do with the bigger cams.
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Old Apr 15, 2005 | 06:05 PM
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Originally Posted by Cal
It takes quite a bit with a good sized cam. With my cam, I think I went 50%, 60%, 70%, 80%. Note that I did the first four columns, not just the first three. That's another thing you have to do with the bigger cams.
Dam at 80% theres only 20% left?Hell if it works i guess thats what ill do.Does it affect anything else that im not aware of.
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Old Apr 23, 2005 | 09:52 PM
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Ok first to time out with car and the car holds ldle to high at stoplights and after about 30 sec it drops down and sounds like its loading up.So i went back and took the ve value out.Car idles better warm with the ve value stock.What else can i change for the cold start
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Old Apr 29, 2005 | 01:19 AM
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Originally Posted by tuff
Dam at 80% theres only 20% left?Hell if it works i guess thats what ill do.Does it affect anything else that im not aware of.
No, no, I mean multiply that part of the table by 0.8 so there is 80 % left.
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