1995 P30 backfiring thru intake when hot
Hi, wondering if anyone has had a similar problem like this:
1995 southwind 33 ft P30 7.4L TBI with Banks exhaust. 73k miles. Rv gets used alot. Every 3 weeks or so.
Starts loosing power and popping after it is warmed up. Takes about 10 minutes. Wont do it when cold, happens mostly at partial throttle when cruising about 60. Also happens after starting out from a stop. Doesn't seem do it under WOT .
Facts:
1. I removed the banks cold air snorkel, problem was much worse. Points to a lean condition.
2. Idle is perfect. No signs of vacuum leaks.
3. Replaced O2 sensor
4. Replaced MAP sensor
5. Replaced fuel filter.
So, it seems to me that this starts to happen when the computer switches over to "closed loop". That means its using the O2 sensor for feedback. But i replaced that. Does anyone know what else the computer uses to control fuel rate when in closed loop? Or, any other suggestions?
Thanks!
1995 southwind 33 ft P30 7.4L TBI with Banks exhaust. 73k miles. Rv gets used alot. Every 3 weeks or so.
Starts loosing power and popping after it is warmed up. Takes about 10 minutes. Wont do it when cold, happens mostly at partial throttle when cruising about 60. Also happens after starting out from a stop. Doesn't seem do it under WOT .
Facts:
1. I removed the banks cold air snorkel, problem was much worse. Points to a lean condition.
2. Idle is perfect. No signs of vacuum leaks.
3. Replaced O2 sensor
4. Replaced MAP sensor
5. Replaced fuel filter.
So, it seems to me that this starts to happen when the computer switches over to "closed loop". That means its using the O2 sensor for feedback. But i replaced that. Does anyone know what else the computer uses to control fuel rate when in closed loop? Or, any other suggestions?
Thanks!
