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New Member
- Joined
- Aug 21, 2007
- Messages
- 18
- Reaction score
- 0
- Points
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- Age
- 43
- Vehicle Year
- 91
- Make / Model
- Ford
- Transmission
- Automatic
I finally got my truck to run smooth but its still running rich. The plugs are powder black color, it struggles at idle and the exhaust leaves a black spot on the ground. If I prevoke a small vacuum leak it runs much better and the exhaust is clean. My ECU coolant temp sensor seems to check out but I haven't been able to check anything else. All the plugs are the same and it doesn't miss so I don't think its a leaky injector. I pulled the vacuum line on the fuel pressure regulator and it doesn't leak although the fuel pressure regulator still could be running at too high a pressure. I don't have any way to test the fuel pressure. My next thought is the o2, MAP, MAF (I cleaned it already), or intake air temp sensor.
I want to test the o2 sensor but don't know what wires are what. I know two are heat and the other two are signal. Which wires are which?
What are the most likely causes of a rich condition?
btw, when I hooked up a code reader the tests ran (rpms went up and down, ect...) but the result was always "unresponsive".
I want to test the o2 sensor but don't know what wires are what. I know two are heat and the other two are signal. Which wires are which?
What are the most likely causes of a rich condition?
btw, when I hooked up a code reader the tests ran (rpms went up and down, ect...) but the result was always "unresponsive".
