Question on MAF Sensor

[VXtreme]

Does anyone know what the parameters of our MAF sensor? Does it use frequency or voltage feedback to the ECU? What are the frequecency or voltage ranges, minimum and maximum values?

The reason for the question is that I want to install a Split Second Frequency or Voltage clamp between the MAF and the ECU. I am having trouble tripping the CEL and getting the a problem code for the MAF. Apparently when I am under boost for a long period of time, the MAF is sensing more air coming into the engine then it can correct for. It trips the CEL light and then after about 20 - 30 minutes of normal driving, it resets itself. The problem is that when the CEL light is on, the engine will run erratically until it resets. From what I have read on the Split Second clamps, it should solve this problem. I just need to know what the spe'cs are for the MAF so they can progam the clamp for my specifications. You can go to this site and check out Split Second products: www.splitsec.com . Thanks for any help I can get. VXtreme

[Hotsauce]

Its a GM hotwire sensor.

No one else is having this problem, how much boost are you running?

John C.

[VXtreme]

About 6 PSI. I have spoken to John at Alpine Developments and he indicated that he has had similiar problems with the S/C that are running 5 PSI or higher. He also felt the frequency clamp would resolve the problem. The problem is that I live in Park City and have to drive up a steep 10 mile grade each day from Salt Lake City. On the dirve up, the S/C is under full boost for quite awhile and the MAF reads a higher them normal flow rate through it. The OBDII scan tool indicated that the fault code is on the high frequency parameter which is due to higher then normal flow rate going through the MAF. I spoke to Split Second and they feel confident that the frequency clamp will resolve the problem. They just needed to know what the frequency range is and whether it was registering a fault code on the low or high frequency signal to the ECU. I'll keep you posted on how the fix goes.

[Cyrk]

VXtreme about 6psi... how are you running that? Did you get a new pulley?
Good luck on the fix.

[VXtreme]

Yea, forgot to mention I had my 5PSI pulley machined down a little smaller then it was. My Autometer Boost guage shows a pretty constant 6 PSI of boost under full throttle now. It does run like hell when it is getting full boost, even at this altitude, but I have to fix the code problem. I'll let you know how it all works out.

[deton8r]

I'm having MAF issues at WOT with the Alpine s/c on my Axiom and have also talked to John at Alpine about it. I think the issue is compounded on the Axiom due to the 'drive by wire'. Another Axiom owner is getting the same OBDII codes I am. He tried the Split Second voltage clamp with no success. I considered the MAF Translator Plus but it could be an expensive mistake. I'm probably going to resort to a UNI-Chip solution which John said would definitely fix my problem and free up several ponies. I'm also watching the 0-60 times post regarding the Motec ECU to see if that's another option.

My s/c setup was great until I ditched the stock airbox/restrictive intake and went with a straight tube with a K&N cone filter. Initially I had the MAF screen removed but I still get the codes with the screen back on but things are slightly better. I have since learned to keep my foot out of it because when I hit the limit, the Axiom goes into Reduced Power Mode (limp) mode.

What codes are you getting? I get the following:

P1514 - TAC System MAF performance calc airflow vs. RPM vs. TPS

P1125 - Accelerator Pedal Position System

P1295 - ??? still researching this one.