Does anyone have any tips for idle misfire tuning? I have an 04 Comp G with a VS cam, 39lb cobra injectors, 85mm MAF and the usual other stuff. I never had idle misfire issues until I installed the cam. Cyl 5, 4 and 3 are the worst for misfire counts. The car runs great and the misfires only happen at idle. I see in tiny tuner there is a rough idle injector skew table. has anyone tried skewing the injectors either way to help. I see the #3 is already skewed to 102% stock. I tried increasing the idle timing up to 25 with my HPT but it really made no difference. The firing order is 165432 so when cyl's 5,4,3 start misfiring it makes for a pretty rough idle. any advice would be appreciated.
Help with idle misfire tuning
- Thread starter csandmann
- Start date
Fivefingerdeathpunch
New member
well just so you know this. Once a 3800 is fairly modded, idle misfires are just gunna be part of the game, and you cant stop it from happening.
Tho it seems like you have a little worse case with having many many misfires.
How do your plugs look, are the wires in good shape?
What gap are you running and what plugs aswell?
Tho it seems like you have a little worse case with having many many misfires.
How do your plugs look, are the wires in good shape?
What gap are you running and what plugs aswell?
I'm using AL104 plugs and the wires are Delco's less than a year old. The car is wideband tuned so I'm not super rich so fouling shouldnt be an issue. I see no misfires above 1200 rpm at all.
Before I installed the cam my fuel trims at idle were arould -1 now after the cam install when it first starts to idle the trims are still -1 the when the misfires start the go to -8 obviously to counter the presumed richness of the unburned fuel. in affect making the other injectors leaner. which inturn I believe makes the misfiring worse.
I'm really curious what the rough idle injector skew table does. if anything
Before I installed the cam my fuel trims at idle were arould -1 now after the cam install when it first starts to idle the trims are still -1 the when the misfires start the go to -8 obviously to counter the presumed richness of the unburned fuel. in affect making the other injectors leaner. which inturn I believe makes the misfiring worse.
I'm really curious what the rough idle injector skew table does. if anything
