PDA

View Full Version : 7427 $OD leaning issues with a 7.4



sank
10-15-2016, 10:12 PM
I slowly been working on this truck. It's a 1995 Chevy 1500 with the 7.4 and 4L60E trans. I'm using the 350 computer/chip that was in it to make it work and been tuning the chip to the 7.4. So far it been going decent but we keep having an issue were it wants to lean out on me for no reason and was wondering if anyone else had any issues with the $OD wanting to lean out on them. Even if I'm in park and not touching anything I see on the A/F gauge be idling in the 13's then it will lean out to high 14's into the 15's before the computer corrects it back down. The biggest Issue is when I'm coming to a stop it would lean out into 15-17 ranges then the truck would stall out on me time to time. and the troubling issues is that it never leans out the same. Sometimes it leans out to 17 then the next stop it would lean out to 15, then the next stop it might not lean out or it leans out again. It never consistent. I don't get why it doing whats it doing, I been trying to tune the VE tables to help keep it from doing it but it still does it. I'm not sure if there a setting we are over looking or what it is.

ihbrewer
10-17-2016, 10:43 PM
Possible map sensor issue,I would watch the voltage and probably set up a vacuum gauge to monitor the sensor.