Engine Stalls after Throttle Body and MAF cleaning

I just cleaned the throttle body and MAF for first time on my 2008 Prius with 145K miles. Original owner. Used an old towel soaked in cleaner around a screwdriver and used that to clean the inside of the TB by rotating the butterfly. Followed a DIY vid on You Tube. Got some grime but not as much as I would have expected. Have changed the air filter pretty regularly so maybe that helped.

Also removed and cleaned the MAF sensor by spraying the sensor with the MAF cleaner. Made sure not to touch it.

Reassembled and made sure the MAF sensor was re-attached with a click. Also was conscious to make sure good air seals in hoses.

Now, car starts fine, but stalls and dies after 30-60 seconds. Never had that happen before. I must have messed this up somehow.

Any ideas what might have happened? Should probably say that engine was idling and running fine until I did this cleaning. Grateful for any wise help.

 

Ed, JC9, really grateful to both you two for trying to help. Ed, I wondered about the 10 mm clamp band underneath the air filter assembly. Hard to see if good connection so I took it apart and had already redone. I think it's a good seal. I tried starting the engine without the MAF sensor connected. Wouldn't start and got me a Check Engine light. That has gone away after reconnecting the MAF and starting the engine a couple times. I currently have no warning lights nor Check Engine Light.

JC, was hoping that disconnecting the 12 V battery would fix the problem. Disconnected for a few minutes, reconnected, but unfortunately got same failure signature.

1. Car starts easily and seems to run smoothly. After 30-35 seconds (stop watch timing it now), stalls very quickly.
2. Waited about 5-10 seconds and restarted. Engine stalled almost immediately.

Same as before the battery reset.

If I'm not getting a Check Engine light, is it safe to say that i haven't inadvertently de-mated another connector?

Could I have somehow damaged the MAF by spraying it with MAF cleaner?

Any other ideas? Will try disassembling and reassembling while my on-line consultants are thinking ;-) Thanks all.

 

Now with a few photos of the throttle body after the air filter assembly is removed and of the MAF out of the air filter assembly. Anyone seel anything amiss?

 

Throttle body cleaner sprayed on a rag wrapped around a toothbrush. Sometimes the soft toothbrush with the throttle body cleaner. If the butterfly plate is sticking, wouldn't I be able to notice it when I poke my finger down the throat? Seems like it opens and springs closed as before. Thanks!

 

About a 1/2 tank. Put it all back together paying extra attention to tight air seals and seems to be running fine now. I'm thinking I had an air leak somewhere that I corrected by disassembling and reassembling....and the roughness at first with pulsating idle was some kind of readjustment to a cleaner TB and MAF sensor. Really grateful to everyone to help me troubleshoot. All for now....unless I get stranded somewhere....many thanks!

 

Still running strong after a couple days to / from work. Seems my mileage is significantly up after cleaning the throttle body and MAF sensor which was the original objective. First time to clean in the 10 year / 145K history. Mileage is back closer to where it was when my Prius was newer. ed, thanks for the tip on lubing the butterfly axle spring, hood latch. What do you recommend for the butterfly and hood latch? I always use graphite powder on locks. I assume that's OK for driver door lock. Good thought to lube as have smart key so very rarely use back up key out of fob. Thanks again to all.

 

The rag was wet but soaked up the fluid, evaporated quickly, so not close to dripping down throttle. FWIW.