interesting "stumbling" problem 00' impala
hello all. let me start by saying that i have not experienced this problem myself.
lauren has been complaining that when she goes to accelerate to merge onto the highway the car seems to stumble and jumps between 1,000 and 1,500 rpm with a steady planted foot. (around 1/2 throttle or so)
my first thought was TPS, or MAF. so i promptly hooked up my scanner and set it to live data. the MAF is almost identical to my car (also 3800 sII) and the TPS is perfect (atleast when i tested it) no jumps or dead spots at all. it will read down to the 0.10% and it read every tenth of a percent. one thing i did notice though, is at idle, it reads 0.4%. my car reads 0.0%.
another thing i noted, is that if you very quickly floor it then go to zero throttle the car actually almost dies trying to recover. similar to the way a cold carbureted vehicle would. so much so, that the lights actually dim from dropping so far in RPM.
i could not make it die dispite trying this floor it let competely off for over 5 minutes. the fuel trims are also good, at idle it occasionally drops to -0.5% but i checked the FPR and it is not leaking. -0.5% was the largest negative number.
i plan to road test it on friday, but i figure she is about as accurate as i am going to be able to be in explaining the problem. any help is much appreciated!
6000k headlights, LED license plate fog lights, tinted taillights and to top it all off, 2 12" air horns!
the gf:'00impy 3.8, every option. COTM July 2013