These tend to leak and the antifreeze will run down the heater coar pipes into the cabin hvac box and cause a smell of coolant in the cabin. Your engine is designed to run on specific values, if there are no codes besides a lean mixture code and the engine is running ok the problem is a sensing value problem. This happens 50% of the time. The P017X codes mean your ox2 sensors are picking up a lean burn condition. The test fails when the adaptive fuel tables reach a rich calibrated limit. I have attached photos of the non-heated hose. If you have logged both codes, however, it is unlikely that a leaking manifold would be the issue since both manifolds would have to be leaking.
Misfires are usually bad spark plugs, but could possibly be caused by insufficient fuel. On Ford some models dirty air filter, and dirty or faulty air flow sensor are the cause of the problem. If an exhaust leak is present before the oxygen sensors it can cause the sensor to produce a false reading. Intake Manifold Gasket Leaking If the engine is a V8 or V6 and only one side or bank is reporting a fault code it could be a leaking intake manifold gasket or leaking manifold. You also could have an exhaust leak near the upstream o2 sensor. What else can I try? I have searched for P0171 code but most what I can find are P0171 and P0174 combination.
Should solve problem and increase gas mileage. Check the integrity of all vacuum hoses at each end of the hose. But then a vacuum condition in the exhaust is created after the exhaust valve closes. Engine exhaust is produced in pulses as the cylinder's fire. Here are the typical symptoms that something is wrong when you have code P0171.
Not exactly sure, I was sleeping when he called. Your mechanic will more than likely find multiple hoses that are rotted and leaking, causing your intake leak. Posted on May 12, 2011 The Codes 0171 and 0174 are indicating lean running conditions on both banks. This youtube video is a great resource for diagnosing the P0171 trouble code in your Expedition. One of the most common trouble codes with the Ford Expedition is the P0174 code.
The Engine Control Module calculates the necessary compensation to correct the offset between the actual and the theoretical ratios. Tip 2: Some of my testing suggestions involve tests with the engine running, this means you've got to be on your toes and alert. One of the most common trouble codes with the Ford Expedition is the P0171 code. Pcv valves rarely fail, occasionally they get stuck, but it's cheap enough. Mechanic said he needs to smoke check it and go from there. Hello, The exhaust system is used to transfer exhaust gases to the rear of the vehicle.
For most people the first sign that anything is wrong at all is the service engine soon light coming on. Swap the 1 injector to a different location to see if the code follows. In case the amount of the compensation value is extremely large The actual mixture ratio is too lean. Sent from my N9131 using Tapatalk. With the engine running, use an old spray bottle and water mist the seams of the Intake. Replaced O2 Sensor Bank 1 2.
Sometimes this element can be cleaned with an aerosol cleaner such as carburetor cleaner. Luckily my mechanic did not charge me for all he did. If there are no intake leaks, the next step is to replace the air filter and clean the air flow meter. Start your engine, let it idle. Changed that and its running great.
Hard to trouble shoot this from my computer desk. To provide a better website experience, axleaddict. If not other possibilities are front O2 sensor is too old and should be replaced if mileage is greater than 100k then replace. The correct fuel delivery is essential for proper engine operation. The problem is that theory is not exactly true. In case the amount of the compensation value is extremely large The actual mixture ratio is too lean. This usually happens because extra air is getting into the engine.