i am getting a code 33 and a ses light constantly, it started doing this yesterday, i have an extra MAF sensor, that i am going to try putting on later.what could be causing this? i checked out the MAF on the car, and the wire is not broken,,

------------------
87 IROC-z 305 TPI 5spd 10-bolt 3.73 posi ,8.8 Accel wires , bosch platinum +4 plugs,MAF sensor screens removed, gutted air box, ram air, K&N air filters,TB coolant bypass ,polyurethane tranny and torque arm mounts, K&N oil filter,Mobil 1 synthetic oil 20w50, futura GLS super sport tires 265/50/15 rear and 235/60/15 front mounted on 86 monte carlo SS rims ,

400 sbc and a 6 spd in the works

 

I've gotten the low voltage reading(code 34) from bad MAF connections, but I've never had the code 33. I would suspect the actual sensor is bad, or you could have a vacuum leak somewhere near the sensor. If the new MAF doesn't fix the problem, replace the relays and make sure all of the wiring is good.

 

Do a search on code 33.