Is this normal?
Is this normal? Just got my car retuned by mike norris. he is an absolute great guy, and i was extremely happy with the experience. the car has ran great since his tune, but i do have one question about something that has came up. when i have the ac on max turned up all the way, and as cold as it will go, the car wont start without some throttle. and also, when i was out messing around a back road in the middle of nowhere, I tried messing around with launching the car. again the ac was on, and after launching the car, i saw someone coming down the road on a moped. so i got on the brakes pretty hard so i wouldnt scare them. when i got on the brakes hard, the rpms dropped really low and the car almost stalled out. so this got my attention, and after the moped passed and i was sure the road was cleared again, i did the same thing. i launched the car hard, and then got on the brakes a few seconds later, and the car died. now, is this normal? it doesnt seem to be a problem with the ac off. i dont remember having this problem before the retune. the car runs waaayyy better in every other way, im just wondering if this is normal. also, the previous tuner had tuned out my front 02s.. Mike said something about this affecting warm up times and idle. could this be a factor? i plan on calling mike and talking to him about this tomorrow, but thought i post this so i could be more educated on the subject. or if its normal, ill make sure i dont waste his time. haha thanks guys!
Sounds like the ECM doesn't know to bump the idle to account for the increased load with the A/C on. Your tuner should be able to take care of it.
I would say I have seen nasty throttle bodies do this as well but I am going to assume yours is clean.
I would say I have seen nasty throttle bodies do this as well but I am going to assume yours is clean.
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TECH Enthusiast
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Hey guys I see several of you are having the exact same problem I have been having. I had my cam installed and dyno tuned and the dying issue came up. I called my tuner and he sugguested that turn the throttle blade screw in a little to bring in more air at idle. I adjusted the screw and it seemed to help sitting in my driveway but I have yet to drive it. I hope this will help you guys.
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Verdad Gallardo ^^what exactly do the front O2's do? I know mike said that he couldnt understand why the previous tuner had tuned them out. but i thought it was common to tune out rear 02 sensors when installing LTs? Mike said multiple times that he had no idea why it was done like that, and that it was kinda like having a carb on the car? does that sound right? I may have heard wrong, haha.
thanks for the advice man. but my car sits at idle great, at right about 950 rpm. its really just a problem during heavy acceleration followed by hard breaking while the ac is on.
TECH Enthusiast
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Your having the exact problem I have. If I am driving and all of a sudden stab in the clutch to slow down it dies almost instantly with the a/c on if I have the a/c off it will never die.
the front o2's is where the computer senses how the afr is. without those the car wont run right. the rear o2's are there to check and see if the factory cats are doing their job, but almost everyone deletes them because with all aftermarket exhausts there is no need for them.
^^what exactly do the front O2's do? I know mike said that he couldnt understand why the previous tuner had tuned them out. but i thought it was common to tune out rear 02 sensors when installing LTs? Mike said multiple times that he had no idea why it was done like that, and that it was kinda like having a carb on the car? does that sound right? I may have heard wrong, haha.
Seems to me like u need the IAC adjusted but that is not a big problem if its only doing it w/ the A/C on and a cam could also affect it w/ the A/C on.Mike will let u know.
ahh ok guys. thanks for all the advice. i know mike will set me straight! cant speak highly enough of him. gave him a call today and left a message, i know he is in florida this week but im sure ill hear from him early next week. ill let you all know what i find out!
what would it take to bring the O2s back? would it just be a matter of tuning them back in? mike said something about how because they were tuned out it would affect my warm up time, but he said if it didnt bother me then he wouldnt ask me to pay the money for no reason.. so do i need to buy new O2's
what would it take to bring the O2s back? would it just be a matter of tuning them back in? mike said something about how because they were tuned out it would affect my warm up time, but he said if it didnt bother me then he wouldnt ask me to pay the money for no reason.. so do i need to buy new O2's