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Start up fuel trim, F/IC

Old Jan 20, 2009 | 12:06 PM
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Default Start up fuel trim, F/IC

My car has been taking a pretty long time to start, mostly because it's been 5-10 degrees outside in the morning and it's starting to annoy me. I was just wondering how much fuel you guys are pulling for start up. I believe it's the 0 RPM/14 LOAD box in the fuel map. I've tried a bunch of different values and nothing is really making a difference. And my plugs are fine.
Old Jan 20, 2009 | 02:59 PM
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Default Re: Start up fuel trim, F/IC

Originally Posted by CarbonXe
My car has been taking a pretty long time to start, mostly because it's been 5-10 degrees outside in the morning and it's starting to annoy me. I was just wondering how much fuel you guys are pulling for start up. I believe it's the 0 RPM/14 LOAD box in the fuel map. I've tried a bunch of different values and nothing is really making a difference. And my plugs are fine.
The FIC will take a sweep through the 14 PSI cell and sweep through to the set idle cell, which will be somewhere around 5-8. It takes a weighted cell average of those and slightly alters the cold start enrichment tables as a result. I have whitnessed this personally a few customers cars. Simply add a small % of fuel to those cell effected and see how it works on starting.
Old Jan 20, 2009 | 03:23 PM
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Got it working better. I was pulling a little timing for that initial 14PSI LOAD block and that seemed to have been throwing it off. Once I changed that back to 0, it started firing right up.
Old Jan 20, 2009 | 03:23 PM
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Originally Posted by CarbonXe
Got it working better. I was pulling a little timing for that initial 14PSI LOAD block and that seemed to have been throwing it off. Once I changed that back to 0, it started firing right up.
Great!
Old Jan 20, 2009 | 03:24 PM
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yeah generally a car needs more enrichment especially on very cold start up.. try add some enrichment on 0-1000 rpm on somewhere on the idle area
Old Jan 20, 2009 | 03:26 PM
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I found it was harder to start with more fuel. I'm at -52% to -54% for idle, and so far, having that initial start block at -63% seems to work out the best for me. I messed with my tune and pulled some more timing the other day and didn't realize that I changed the entire row rather than just in boost .
Old Jan 20, 2009 | 03:46 PM
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check your ignition too on the scangauge, idle should be around 7 to 15 ideally
Old Jan 23, 2009 | 01:39 AM
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crap i need to do this too....on really bad days the engine would turn over like 6 times before it started. thank god its getting warmer and a summer job will definately pay for a lot of crap
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