issue with throttle after acceleration
Thread Starter
Joined: Mar 2006
Posts: 13,632
Likes: 824
From: Fresno, CA
issue with throttle after acceleration
dunno how else to explain it.
stock IX MR with a Burschur intake kit and 3" TBE. all else is stock. no cat, rear O2 mods done via ecuflash.
if i accelerate at a "somewhat" decent pace.. then let off.. then get back on the gas, i have a nasty stumble. like fuel is loading up.
i'm under the impression that intake/exhaust should lean the car out, so this seems strange to me.
this is at low rpm, as when leaving form a stop light (2-3k rpm or so). it makes driving in parking lots a bit difficult. WB will be installed tomorrow, so i can't say what the car is doing (still trying to figure out how in hell to log it with Evoscan).
anyone have any quick ideas to try?
stock IX MR with a Burschur intake kit and 3" TBE. all else is stock. no cat, rear O2 mods done via ecuflash.
if i accelerate at a "somewhat" decent pace.. then let off.. then get back on the gas, i have a nasty stumble. like fuel is loading up.
i'm under the impression that intake/exhaust should lean the car out, so this seems strange to me.
this is at low rpm, as when leaving form a stop light (2-3k rpm or so). it makes driving in parking lots a bit difficult. WB will be installed tomorrow, so i can't say what the car is doing (still trying to figure out how in hell to log it with Evoscan).
anyone have any quick ideas to try?
Evolving Member
Joined: Feb 2009
Posts: 169
Likes: 1
From: Spokane, WA
dunno how else to explain it.
stock IX MR with a Burschur intake kit and 3" TBE. all else is stock. no cat, rear O2 mods done via ecuflash.
if i accelerate at a "somewhat" decent pace.. then let off.. then get back on the gas, i have a nasty stumble. like fuel is loading up.
i'm under the impression that intake/exhaust should lean the car out, so this seems strange to me.
this is at low rpm, as when leaving form a stop light (2-3k rpm or so). it makes driving in parking lots a bit difficult. WB will be installed tomorrow, so i can't say what the car is doing (still trying to figure out how in hell to log it with Evoscan).
anyone have any quick ideas to try?
stock IX MR with a Burschur intake kit and 3" TBE. all else is stock. no cat, rear O2 mods done via ecuflash.
if i accelerate at a "somewhat" decent pace.. then let off.. then get back on the gas, i have a nasty stumble. like fuel is loading up.
i'm under the impression that intake/exhaust should lean the car out, so this seems strange to me.
this is at low rpm, as when leaving form a stop light (2-3k rpm or so). it makes driving in parking lots a bit difficult. WB will be installed tomorrow, so i can't say what the car is doing (still trying to figure out how in hell to log it with Evoscan).
anyone have any quick ideas to try?
mostly likely you need a tune, but the stumbling could be caused by leaking throttle body seals.
do a boost leak check, then you should head on over to GST motorsports (since you are somewhat close to them) and get a decent tune.
do a boost leak check, then you should head on over to GST motorsports (since you are somewhat close to them) and get a decent tune.
Other things - general deviation on the LTFT low/mid can cause this. Since the switchover point is at an airflowhz frequency you can wind up "bouncing" between the two trims in the same fuel/load cell (which should be 14.7 on a stock setup anyway) and changing the fueling by a large margin.