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05 gtp afr keeps changing

K

kurupt305

New member
Got a tuning question for you i have a 05 gtp now when my tuner tunes my car we get the afr set right today it was 11.0 I know a lil rich now seems after about thirty minutes the car wants to change the afr in second gear to 12-13 causing knock does my tuner need to run open loop on the tune what could be going wrong that the car changes the fuel trims?

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Are you going by commanded and actual AFR with a wideband?

Setting commanded AFR to 11 is easy and fuel trims will not pull that much fueling if any at WOT with these dumb pcm's.

Perhaps you have a real fueling problem, like a failing pump or clogged fuel filter if you are commanding 11.0 but are seeing over 12 on the wideband. Watching injector duty cycle is anything to watch, you could be maxing them.
 
Ok good so here's the thing im on 60# injectors running a zzp 350lph pump with rewire all bolt ons xp cam 3.4 pulley and my idc is 85% which has to be way to high

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