car is constantly stalling out with no codes thrown

nomodsjk

Car acts like its fuel starved at idle and low speeds but at wot runs fine. Im not getting any codes which is obviously the hard part. For those who arent familiar with my build i have the stillen sc plus their headers test pipes and cat back with a custom tune. This is really f-ing frustrating and embarrassing considering all the work thats gone into this build. Ive recently cleaned the tb's maf sensors and swapped out my k&n's for a clean set and did the manual idle air and throttle body relearn procedures. Before i did all the cleaning this problem was minor and i was always getting tge tps codes but now its major and no codes. Im getting tired of stalling out at every stop light or sign. Once the oil temp is up around 180 it doesn't seem to do it anymore

SouthArk370Z

Your tuner (or other mechanic) should be able to tell you what's going on by monitoring O2s, timing, &c.

Rather weird that the problem is bad enough to cause the engine to stall but no codes are thrown.

Subbed to see what you figure out.

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DEpointfive0

Air hose leak?

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nomodsjk

Yea it's really pissing me off

nomodsjk

Yea the 02 is probably a good lead cuz my wide band won't read correctly but that happened before this and I just thought it was the Bosch sensor since again no code

Chuck33079

What do the logs say?

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nomodsjk

Can i still data log with my uprev cable after my custom tune?? Do i just need to download the software??

Chuck33079

Yeah, all you need is the Cypher program from Uprev. It's a free download if you already have a cable.

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nomodsjk

OK so I successfully recorded two data log sessions. What should I be looking for? My feelings is its either the mafs or maybe fuel pump. This is another theory of mine please let me know what you think.... This bogging down issue started after my apt with r/t tuning when my idle was lowered and I had my stillen lightweight crank pulley installed and about a week after I had my csf triple pass radiator installed (@ Nissan dealership near me). Could the crank pulley and my lower idle prevent my belt from spinning at the rpm's needed to power the motor? I immediately had problems with the new radiator and it really seemed connected in my opinion but I'm far from an expert. I know some people say the lightweight pulleys can throw off balance so I'm just throwing it out there

Chuck33079

Send your logs to your tuner. I don't see how the radiator could be causing any of this. It could be that the idle is too low, but see what RT has to say.

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nomodsjk

I suspect the radiator has something to do with it because when I turn the ac on the problem gets way worse but I guess that would be the extra power required to run the compressor??? That's what I meant by the radiator but I'm not sure if the oem would have been any different