Crown Victoria with DTC P0171 & P0174 - OBDII

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Crown Victoria with DTC P0171 & P0174

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Author	Topic: Crown Victoria with DTC P0171 & P0174
kpn Junior Member	posted 02-09-2005 01:27 AM I understand that the system is too lean in bank 1 and 2 but I am new to this and need direction on where to start. The only obvious problem I have while driving is that at times it idles a little rough while stopped and has stalled a few times while stopped. I pulled the freeze frame data which is: Engine RPM 582 Calculated Load 21.2% Coolent 189F Long Term Fuel Trim 1 25.0% Short Term Fuel Trim 1 38.3% Long Term Fuel Trim 2 25.0% Short Term Fuel Trim 2 35.2% Vehicle Speed 0 mph Fuel System Status Closed IP: Logged
kpn Junior Member	posted 02-09-2005 02:17 PM I think I fixed it I found a vaccum line from the PCV valve to the throttle body that was completely demolished. Cleared the code and they haven't come back. IP: Logged
carfixer Member	posted 02-09-2005 03:44 PM I was just about to tell you that you had a vacuum leak. According to the freeze frame the trims maxed out and the code set at idle. This indicates a small vacuum leak. The reason it sets at idle is bacause the amount of unmetered air is the same at idle as it is at highway speeds. Under higher RPM the amount is much less overall and the system can maintain fuel control through the trims, but at low engine speeds the amount of unmetered air is much more of the total overall. IP: Logged
kpn Junior Member	posted 02-10-2005 12:28 AM What should the Long tern fuel trim & Short tern fuel trim be while idling and driving. Were can I get the normal PID data for my car IP: Logged
carfixer Member	posted 02-10-2005 08:20 AM quote: Originally posted by kpn: What should the Long tern fuel trim & Short tern fuel trim be while idling and driving. Were can I get the normal PID data for my car I like to see trims under 6 or 7 percent, but the rule of thumb is don't go looking for a problem until the trims go beyond 10%. If you're driving at a steady speed/engine load the trims should head toward zero. As soon as you add throttle or decelerate the trims will be affected appropriately. The factory service manual probably has a chart showing what the pid's are on a good running engine at idle. These will be ball park. IP: Logged

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