Maf Voltage

[GodziRRa]

Hi guys!

What is the correct GT-R RB26DETT MAF voltage when key on but not started, and when it is at idle? Got some troubleshooting w/ my cold start problem lately, and found out that my MAFs are giving different values all the time. For example when I turned the key on, the other reads 0.25 v while the other is only 0.18 v. But when the car is on idle that is where the difference becomes bigger, 1.25 v vs. 0.80v .

Any inputs will greatly be appreciated.

Edited February 5, 2011 by GodziRRa

[Moodles2]

Try switching the MAFs around, see if the same MAF does it in the other's spot. While you are at it, use some contact cleaner/MAF cleaner on the air sensor in each. One MAF might be dirtier than the other.

Another explanation is if you still have ceramic turbos, one might have chips in the exhaust wheel and not performing optimally while the good turbo is doing more work

[GodziRRa]

Try switching the MAFs around, see if the same MAF does it in the other's spot. While you are at it, use some contact cleaner/MAF cleaner on the air sensor in each. One MAF might be dirtier than the other.

Another explanation is if you still have ceramic turbos, one might have chips in the exhaust wheel and not performing optimally while the good turbo is doing more work

I did that mate. I used another MAF, new ECU, checked the voltage signal and ground of the socket via test light... but no success.

I just don't know about the turbos though. But the thing is the car has a cold start problem, and idle is rough when cold. I need to press the gas pedal a bit just to start it when cold. And another thing I notice today is when I step on the gas pedal a bit the rear MAF w/c is low reading will rise above 1V (but still lower than the front MAF), but when I release the pedal the rear MAF will go as low as 0.40 V (engine will shudder a bit) then will rise again to 0.75 or 0.80 V... whereas the front MAF will just go down to 1 V.

Edited February 13, 2011 by GodziRRa

[GodziRRa]

Well you guys might also want to know since I verified today that in some cases it is NORMAL for the RB26 to have a more or less 0.40V difference between the MAFs. Next thing to check in this elusive problem is fueling.