GON
$100 Site Donor 2024
I recently acquired a 2004 Lincoln Navigator with the 5.4L Intech 32v engine, 141k miles. The engine was having a misfire (0306) on cylinder six, and P0171 on bank one.
I changed the spark plug and the COP on cylinder six, but still had the misfire. I replaced the PCV and related hoses, and the P0171 appeared to go away. Misfire still remained, but would take a while to show up on the scanner. The SUV idled poorly, but seemed to run fine at highway speeds. At 4am this morning, I went to inspect all the vacuum lines with a flashlight. I discovered the what I believe the crankcase breather hose the goes from the engine to the air filter was not connected. It appears the hose was off for an extended amount of time. Leaving a opening to the engine. No oil or any debris was showing aroung the opening, just a lot of dust and dirt.
After connecting the crankcase breather hose, I decided to go on an early interstate test run. About 15 miles into the run, at a high speed, the low oil pressure light came on. I was unable to pull off the interstate, and slowed down and made it to an exit ramp. On the exit ramp the engine made the sound of metal on metal. I pulled over, and checked the oil. It looked overfilled. I checked coolant level, no change in its level. I had my scanner, no misfire on cylinder six. no P0171. But had a new code, which I cant remember but it was something about to much fuel getting to a oxygen sensor.
Called a tow truck, and had the truck dropped off at a local shop, and I took a uber home (I have no driveway).
I suspect the engine had a catastrophic internal failure. The engine will turn over, but not easily. It will try to start but does not.
On a side note, I am aware of the same engine in a 2004 with 120k miles available for $450, but I have to pull the engine and the SUV is smashed and in a field.
I changed the spark plug and the COP on cylinder six, but still had the misfire. I replaced the PCV and related hoses, and the P0171 appeared to go away. Misfire still remained, but would take a while to show up on the scanner. The SUV idled poorly, but seemed to run fine at highway speeds. At 4am this morning, I went to inspect all the vacuum lines with a flashlight. I discovered the what I believe the crankcase breather hose the goes from the engine to the air filter was not connected. It appears the hose was off for an extended amount of time. Leaving a opening to the engine. No oil or any debris was showing aroung the opening, just a lot of dust and dirt.
After connecting the crankcase breather hose, I decided to go on an early interstate test run. About 15 miles into the run, at a high speed, the low oil pressure light came on. I was unable to pull off the interstate, and slowed down and made it to an exit ramp. On the exit ramp the engine made the sound of metal on metal. I pulled over, and checked the oil. It looked overfilled. I checked coolant level, no change in its level. I had my scanner, no misfire on cylinder six. no P0171. But had a new code, which I cant remember but it was something about to much fuel getting to a oxygen sensor.
Called a tow truck, and had the truck dropped off at a local shop, and I took a uber home (I have no driveway).
I suspect the engine had a catastrophic internal failure. The engine will turn over, but not easily. It will try to start but does not.
On a side note, I am aware of the same engine in a 2004 with 120k miles available for $450, but I have to pull the engine and the SUV is smashed and in a field.