yazuki101
Member
- Joined
- January 17, 2014
- Messages
- 16
- Reaction score
- 0
- Year, Model & Trim Level
- 2005 Explorer Sport Trac
Hello,
I am having problems diagnosing the cause of the error codes my truck ('05 Sport Trac) is throwing, P0171 and P0174. I know that the problem is un-metered air creating a lean condition. I have recently replaced the entire PCV assembly, including the tubes and both elbow joints (within a year). I tried using WD-40 to see if I could get the RPMs to spike from a vacuum leak in the intake manifold. Unfortunately, the idle is fluctuating so badly that I cannot tell if the spikes are from the WD-40 or just the sporadic idle which was already present. So I tried using a stethoscope to pinpoint the leak and I can hear air movement on the drivers' side, when I insert the end of my stethoscope in between the intake manifold and the valve covers. However, I am not sure if the potential leak would be in the upper or lower gaskets.
So basically, my question is whether I should buy both the upper and lower gasket sets, or is there someway to tell which one is the problem (such as a secondary symptom, like perhaps oil would be present if it was the lower gaskets).
Any help would be greatly appreciated, thank you.
I am having problems diagnosing the cause of the error codes my truck ('05 Sport Trac) is throwing, P0171 and P0174. I know that the problem is un-metered air creating a lean condition. I have recently replaced the entire PCV assembly, including the tubes and both elbow joints (within a year). I tried using WD-40 to see if I could get the RPMs to spike from a vacuum leak in the intake manifold. Unfortunately, the idle is fluctuating so badly that I cannot tell if the spikes are from the WD-40 or just the sporadic idle which was already present. So I tried using a stethoscope to pinpoint the leak and I can hear air movement on the drivers' side, when I insert the end of my stethoscope in between the intake manifold and the valve covers. However, I am not sure if the potential leak would be in the upper or lower gaskets.
So basically, my question is whether I should buy both the upper and lower gasket sets, or is there someway to tell which one is the problem (such as a secondary symptom, like perhaps oil would be present if it was the lower gaskets).
Any help would be greatly appreciated, thank you.