Mass air flow sensor

[86grdnatl]

My car has a scanmaster installed, and under wide open throttle the O2 readings say 003 and the AirFlow reading (AF) says only 91. I have heard that the AF reading is supposed to hit 255 under WOT. Would this indicate that my maf sensor needs to replaced? thanks for any help

 

[bison]

What is the block learn #?

 

[86grdnatl]

The block learn number is 105. The car is running very rich with a trouble code of 45 (rich exhaust indication)

 

[bison]

Your o2 sensor is likely shot. If you are getting readings like that you shouldnt be getting a rich ex code. Your MAF could be bad also. unplug it and see if theres an improvemnet

 

[86grdnatl]

i did replace the o2 sensor not too long ago when i saw the rich exhaust code. After i replaced it tho, the code was still present. So i ohmed the coilpack and found that the middle two coils were dead. Then i replaced the coilpack and ignition module. Would it be necessary to get a new o2 sensor again?

Also, i did unplug the maf when the car was idling and it sounded like it was going to die, but after about 5 minutes of it running terribly, i just plugged it back in.

 

[scot w.]

Just because a part is "New" does not mean it's Good! Always double check new products because sometimes they too are bad right from the start...

Last year I bought 3 brand new AC Delco o2 sensors and every one was bad, under WOT the O2 sensor readings would go to "000" and stay there.

Then just recently we had a customers car in here for a complete restoration that he has been buying OEM parts for 8 yrs getting ready for the restoration day. We installed his NEW coil pack & module and come to find out they were bad..... so always double check!

.

 

[86grdnatl]

Ok thanks. So the 02 sensor is responsible for the 02 mini volts readings on my scanmaster? And after I install my Maf and translator I will check the o2 sensor again

 

[1KWIKSIX]

Ok thanks. So the 02 sensor is responsible for the 02 mini volts readings on my scanmaster? And after I install my Maf and translator I will check the o2 sensor again

Do yourself a favour and make sure you buy a Denso 02 Sensor......I got tired of my AC Delco 02 Sensors crapping out on me....switched over to the Denso's and have not looked back!

 

[SS/GN]

Same as Scott and 1KWIKSIX,alot of problems with the A/C delco junk and the Denso is 1/2 the price from NAPA.

Kevin