Mal code 34 (MAF)

[bobbyw]

Looking for any tips on code 34 for a 87 GN. Car starts but idles rough and quits in drive. If I start a swap of a MAF is there a particular make better than the others to buy?

Thanks,
Bob

 

[NCTURBOS]

I just repaired a car with the same code and issues. It had a bad ground, but runs great now... :biggrin:

Try to find someone local with a known good MAF to try first.


K.

 

[bobbyw]

NC,
Thanks for the reply! Are you talking about a bad ground from the connector or Engine ground / straps? If its from the connector which wire am I looking for? I'm working with the cheap Haynes manual, which doesn't have much for the wiring.
I also dug around the parts bin, and plugged up a 3.8 Bonnivelle MAF which was smaller, nothing changed in the car performace when I hooked it up. But I wasn't sure if that MAF wound work properly anyway due to the part differance.

 

[turbojd]

With the car idling, lightly tap the maf sensor with a screwdriver,if the idle changes or the car stalls most likely the maf is bad. Do you have any AF readings from a scantool at idle? Also the stock rebuilt mafs are a crap shoot to find a properly calibrated one for the GN. I had the same problem awhile back and I went the translator route with the 3" LT1 maf, never a problem since.

 

[NCTURBOS]

NC,
Thanks for the reply! Are you talking about a bad ground from the connector or Engine ground / straps? If its from the connector which wire am I looking for? I'm working with the cheap Haynes manual, which doesn't have much for the wiring.
I also dug around the parts bin, and plugged up a 3.8 Bonnivelle MAF which was smaller, nothing changed in the car performace when I hooked it up. But I wasn't sure if that MAF wound work properly anyway due to the part differance.

Pin-C BLK/WHT wire at the sensors connector is the ground. It runs to the G100 ground. On this particular car I was not able to find the break in the original ground, and someone had hacked quite a bit of the harnesses in the past as well. I ended up making a new ground terminal and wire, running it directly to a new ground source.

One thing I did notice in diagnosing this car... Key on, engine off, the MAF and LV8 numbers would climb in value as the TPS numbers would climb, and then drop back off as the TPS was closed.


K.