Help with redtop in 97-98 240SX

[Nismo1182]

This is for a friend of mine who has a S13 redtop in a 98 240SX.

He is having problems when boost comes on. His ECU is throwing a code 11 and 12 which are MAF and CAS.

The MAF connection is perfect. We double checked the wiring all the way back to the ECU and it was fine. He was using the OEM MAF sensor. Then we thought it was bad so we put on the S14 KA one and a SAFC-2. And we tried a diffrent CAS. Same problems. We tried a diffrent ECU, same problems.

Any ideas on what it can be??

[TachyonS14]

I may be way off base, but maybe try a 300zx maf? Maybe the ka maf doesn't flow enough air. I have no idea i'm just guessin lol.

[Nismo1182]

The SOHC KA MAF is a tad bigger than a S13 SR one. The S14 KA MAF is bigger than the SOHC KA one.

Im still guessing something is still screwy with the wiring but I dont know what. His previous SR (that had a bottom end problem) ran perfect. Now this motor runs fine except for those 2 problems.