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08-24-2008 #1
Starting The Transformation
- Join Date
- Jan 2008
- Location
- Felton, DE
- Posts
- 346
Why does engine run so lean on cold start up?
I finally got my Dual wideband installed on my LS1 68 firebird and i have always noticed that it sputters and shuts off when its cold if i dont constantly give it gas for the first 30 seconds or so. Now that i have a gauge i can see that is goes to 18-20:1 AF! Why would it go so lean? When idling warm it idles right at 14.6 WOT is around 12.8 and cruise is about 13.6. How can i make it run richer when its cold? Just put on an electrc choke? Its 80-90 degrees here when i start it up so i want to be sure its going to start in the winter.
Is there anything i can installed asside from a choke? I have a 50cc acerator pump, timing is about 24 degrees at idle, idles around 900rpm. Idle vac is 12-13hg power valve is a 6.5. Primary jets are 72, secondaries at 76. Carb is a holley HP750 with vacuum secondaries.
1994 Z28 - 13.52@110mph 2.1 60ft T56, bolt-ons, suspension
1978 Datsun 2+2 - 6.0L LS1 swap in progress
1968 Firebird, 2820 dry- 2000 LS1, D&D Viper T56, RAM clutch/flywheel, 236/236 .651/.651 110+4LSA cam, victor JR EFI, 4150 TB, 42lbers, painless harness, Moroso 7qt pan, sfc, trac bars, 3" x pipe side exits, Telstars-30"MT streets/skinnies, mini-tub, 8.5" posi, richmond 4.56s, Hooker lLTs, Denny N20 DS, Fast dual wideband, Shotgun street scoop.
http://www.myspace.com/shawnmacananny
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