3sgte hesitation Options

[rjbibeau]

i'm working with a 2nd gen 3sgte in an mr2 and when it's below 32 degrees outside or so when started it has a wierd hesitation when you open the throttle alittle bit almost like a rev limiter. but when i unhook the tps the hesitation goes away but soon as the engine is warmed up and the tps is connected again it runs perfectly fine. although when we first started the car up the tach was registering but not the right rpm it was under of what it was supposed to be. for example at like 4 grand it would read maybe 2. the car drives perfectly fine after being warmed up. i remember seeing something about the adjustment screw on the afm and it controls how much air is bypassed. would adjusting this screw fix the problem with the hesitation. any ideas?

This post has been edited by rjbibeau: Feb 14, 2008 - 2:08 PM

[lagos]

When i first start the gt-four up, you must let it warm up before you put the foot down, it does have a secondary rev limiter which comes into play when the engine is cold, obviously to stop the engine from being ruined.... just a standard feature i guess..

This is very true. You should never try to boost 3s before its warmed up.
However the 2nd gen 3sgte has some terrible cold weather hesitation issues just when you are trying to drive it normally. After much research, trail, and error, I found found a simple fix that can be done by adjusting the afm that cures it (assuming this is what is causing his problem).