Fullboogie
King of the Ski - OG Jr.
I've been chasing this for a while now and I'm at my whit's end. Maybe some of you guys will be able to help.
Particularly when cold (but it does seem persistent to some degree when warmed up), at light throttle my car experiences a brief hesitation between 1,800 and 2,200 rpm when accelerating. It's just the briefest of hesitations, but I cannot find the cause. Plugs are new, MAF and filter have been cleaned, throttle body is clean. I've logged spark, fuel pressure, FP duty cycle and misfires, but don't see any anomalies in the datalogs in that rpm range. Funny thing is, this problem has been there across 6 Lund tunes and 3 VMP tunes, so it isn't tune related. The only thing I see when this problem occurs is a slight lean out on the wideband, meaning it will briefly go lean by a few tenths of a point then immediately jump back to normal.
It seems to be related to throttle position, because if I am just a little more aggressive with the pedal when accelerating through that rpm range, it goes away. Can a "bad spot" in the TPS cause this? I'm using an older 63.5mm throttle body that came with electronics (this is an '07 GT500), and I'm wondering if there's a glitch in the sensor.
Any ideas what could cause this? Or is there something else I can datalog that may show what is causing this? Any help is appreciated, guys. Thanks.
Particularly when cold (but it does seem persistent to some degree when warmed up), at light throttle my car experiences a brief hesitation between 1,800 and 2,200 rpm when accelerating. It's just the briefest of hesitations, but I cannot find the cause. Plugs are new, MAF and filter have been cleaned, throttle body is clean. I've logged spark, fuel pressure, FP duty cycle and misfires, but don't see any anomalies in the datalogs in that rpm range. Funny thing is, this problem has been there across 6 Lund tunes and 3 VMP tunes, so it isn't tune related. The only thing I see when this problem occurs is a slight lean out on the wideband, meaning it will briefly go lean by a few tenths of a point then immediately jump back to normal.
It seems to be related to throttle position, because if I am just a little more aggressive with the pedal when accelerating through that rpm range, it goes away. Can a "bad spot" in the TPS cause this? I'm using an older 63.5mm throttle body that came with electronics (this is an '07 GT500), and I'm wondering if there's a glitch in the sensor.
Any ideas what could cause this? Or is there something else I can datalog that may show what is causing this? Any help is appreciated, guys. Thanks.
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