hey im new to this forum, and ive had my sc400 for about6 months now, its been undergoing repairs and what not, but there is a problem which i believe is the mass air flow sensor. when its unplugged, my car runs fine, but once pluged in, the tach bounces all over the place and then the car shuts off. here is a video



please help! thanks guys

 

Do you have any friends that can let you borrow or swap a MAF sensor for a day?

 

no im actually the only one with an sc, but there is a guy on the other side of my neighborhood who has an sc, not sure if its a 300 or 400... he removed the emblems. can i try a sc300 maf sensor on mine?

 

Search function is your friend! https://www.clublexus.com/forums/per...for-sc400.html

Seems to me it'd be the MAF, but can't be sure. CEL?

 

moved to maintenance section, please post in the proper sub forum.

could be maf or some say any of the sensor the ecu uses in closed loop. o2 sensors could even be suspect if they have never been changed in a very very long time.

read this thread.
https://www.clublexus.com/forums/per...n-92-94-a.html

 

My car did the same thing... Tried a different maf and it didn't fix it... Had a spare ecu laying around and swapped it out, cel hasn't come back on and car runs great.

 

Yes the cel is on, came out with the codes 13 and 31

 

I don't think it's my ecu, because to get the car running, that was the first thing we replaced

 

First I'd double check that the MAF is properly seated. If it isn't properly seated in the hole and is even at a slight angle it can do that. My car had the same random loping idle. I run with the MAF unplugged for several months, and finally realized it was such a simple fix!

 

Code 13 is RPM signal. Code 31 is the AFM. RPM signal could be the ECU...