| 94K2500 | 08-01-2014 11:04 PM |
7427 MAF Conversion Issues
I have a 94 K2500 with a 5.7l and a manual transmission and have been running a 7427 PCM for a while now. I decided to add a MAF to it, finally got everything installed, burnt first chip w/MAF bin and it fired right up, idled real smooth, seems to run smoother when driving also. My problem is that neither the O2mv nor the MAF frequency shows up in TP, both remain at 0. I have double checked everything and it is all connected correctly. TP does show the grams/sec though. I have no failure codes for either of these, so I was wondering if anyone had any ideas what to look for. I checked both signals and they are present entering the PCM, saw MAF frequency change with a frequency counter, grams/sec that is displayed matched the frequency on meter, and saw o2 voltage change also. I have also tried removing the TBI hat, which would allow un-metered air to enter, and moving the throttle which would cause the engine do die then. So I'm pretty sure the MAF is being used and it has not defaulted back to SD. It almost appears that the adx file is not seeing things correctly. I have tried several different MAF adx files with no change. I can go back to a non MAF bin and the O2 shows up correctly with non MAF adx. Thanks in advance for any help. | 