Car shudders when letting off the gas after MAFT and sensor install

I posted this on the other site and think I have it narrowed down to what the problem is, I just don’t know what is causing the problem. Basically after installing the MAFT, my car will shudder right when I start to let off the gas. It does it probably 80-90% of the time. I found, watching the MAFT that the red LED (WOT) will quickly flash when letting off the gas. Watching my LCDBC and checking logs shows that the airflow Hz will spike up to almost 1900 Hz sometimes. It only happens when letting off the gas which makes me wonder if the MAF sensor needs clocked or if it’s a bad MAF sensor all together.

Thoughts?

What bov setup are you running?

Definitely BOV related.

SSQV recirculating. Kinda what I was thinking as well but the timing just seemed odd that it started exactly the same time as the MAFT install.

Are you running the air deflector inside the maf bubble?

Hmm, I don't know of an air deflector inside the bubble. I haven't removed anything. What does it look like?

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Originally Posted by Forest Gump

Are you running the air deflector inside the maf bubble?

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Just came across this thread on the other site: "Stock BOV Silecer/ Rubber Y pipe section in bubble definitive results." I might check into that when I get back tonight. This is what seems like is happening.

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Originally Posted by GrabberOrange

Just came across this thread on the other site: "Stock BOV Silecer/ Rubber Y pipe section in bubble definitive results." I might check into that when I get back tonight. This is what seems like is happening.

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Yeah, you might be getting some backwash into the sensor that is peaking it. I never had it happen, but I was running the deflector.

Well I verified it does have the insert in the bubble, fixed a couple vacuum plugs that were leaky, made sure all the fuel trims look good. I'm not really certain what the deal is. I figure this weekend I'll swap the stock MAF sensor back in for funsies and see if it does it with that. Outside of that the only thing I can think to do is a full vacuum test but it'll be a couple weeks before I can get to a garage that has a compressor with a regulator.

So I put the factory MAF sensor back in and it runs fine. Not sure what the issue world be. Sensor needs clocked, bad sensor, something else? Thoughts?

I don't have my maft installed yet, so maybe not much help but I do have a couple questions. You say it shudders when 'letting off the gas' - is this anytime, like driving down the highway with no boost or only from a wot pull or part throttle with lower boost? I assume your recirculating back into the stock recirc location at the bottom of the intake bubble? How close to this area is your gm maf installed?

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Originally Posted by GrabberOrange

SSQV recirculating.

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GM sensor is in draw through (factory location). Seems to do it worse light load like when the cruise is trying to keep the same speed. But that might just be my perception. It does it 90%of the time regardless of its coming out of boost or never even was in boost.