VictorDuwon
Member
Howdy everyone,
I have a 2001 Expedition 4.6L XLT, rwd, 186K miles. A few weeks ago, while driving, I heard a thump toward the front of the vehicle, then the knocking started. It is a definite metallic knock which only occurs above 1500RPMs while accelerating. I was doing ~20-30mph at the time. When I let off the accelerator, the knock went away. The truck did not throw a code until I got home, then it was P0301.
So, I opened her up, and replaced the #1 plug and COP. [I bought a full set of plugs and COPs a few years ago, and had leftovers.] The knock persisted.
Next, I replaced the #1 fuel injector with a new one. The knock persisted. Not only does the knock return whenever I accelerate, but after a few minutes the P0301 returns too.
To clarify, it is definitely a p0301 and not a p0300. I've replaced all the components there, and don't know what else to do. This is my daily driver. I'm a decent shade-tree mechanic, but this is straying outside of the things I know how to do. Any advice would be appreciated.
TLDR;
Truck : 2001 Expy 4.2L 186K Knocking on passenger side of motor
Symptoms : The knock can't be heard while the engine is idle, only on acceleration over 1500RPMs.
Low speed acceleration - Knocking
Coasting regardless of speed - No Knocking
Unsuccessful attempts to fix the P0301/Knock:
-Replaced plug
-Replaced COP
-Replaced Fuel Injector
-Fresh Oil/Filter change.
I have a 2001 Expedition 4.6L XLT, rwd, 186K miles. A few weeks ago, while driving, I heard a thump toward the front of the vehicle, then the knocking started. It is a definite metallic knock which only occurs above 1500RPMs while accelerating. I was doing ~20-30mph at the time. When I let off the accelerator, the knock went away. The truck did not throw a code until I got home, then it was P0301.
So, I opened her up, and replaced the #1 plug and COP. [I bought a full set of plugs and COPs a few years ago, and had leftovers.] The knock persisted.
Next, I replaced the #1 fuel injector with a new one. The knock persisted. Not only does the knock return whenever I accelerate, but after a few minutes the P0301 returns too.
To clarify, it is definitely a p0301 and not a p0300. I've replaced all the components there, and don't know what else to do. This is my daily driver. I'm a decent shade-tree mechanic, but this is straying outside of the things I know how to do. Any advice would be appreciated.
TLDR;
Truck : 2001 Expy 4.2L 186K Knocking on passenger side of motor
Symptoms : The knock can't be heard while the engine is idle, only on acceleration over 1500RPMs.
Low speed acceleration - Knocking
Coasting regardless of speed - No Knocking
Unsuccessful attempts to fix the P0301/Knock:
-Replaced plug
-Replaced COP
-Replaced Fuel Injector
-Fresh Oil/Filter change.