Trouble code 157; MAF low; & Rear Manifold Question

[Bruce M]

1993 3.2L ATX

Got this thing running great? Timing belt to tranny all 60 & 120K stuff either new or rebuilt. . Now I'm getting a memory code 157; “MAF out of range low” or grounded. Swapped out MAF with a known good one same thing. No CEL on, nice smooth acceleration and deceleration does not effect how the motor runs. Am I after a bad or broken wire? Anyone have this before?

Secondly: Anyone ever swap out a rear exhaust manifold while the motor is in the car. I have a broken Y pipe stud. Looks like I have more room in this ATX than in my MTX. Never tried this while the motor was still in the car. Any tips, suggestions?

Thanks

 

[Ishodu]

Did you clear the codes once you swapped it with the known good one? If not you would get that same code in the memory.

 

[Bruce M]

I sure did clear the codes.

 

[AREA 91]

I've done MTX manifolds in the car before. Not a problem.