A couple of weeks ago I found a great deal on an 04 Navigator and bought it sight unseen. Has 138000 miles. On the way home the oil light came on then went off a couple of times so I shut it down and put 3 quarts in it as the oil was not on the dipstick. It also had a miss.
I pulled the codes and found P0303 (cylinder 3 misfire) and P0300 (multiple cylinder misfire). I also found a hole in the front of the timing cover that was leaking oil, and after some inspection determined the car had been in an accident.
I ordered new coils and plugs, after some research it looked like coils and plugs were a huge ordeal so I thought I would work on just the problem areas. I replaced the coils on the right (1-4) bank and checked the plugs. It had ok looking iridium plugs so I left them. I fixed the hole in the timing cover. I put new 10w-30 oil (even though it calls for 5-20, 10w30 was the closest I had and I generally don't like thin oils).
After this I got a P0354 (coil D primary/secondary failure) code and a P2198 (right bank 02 sensor stuck open), with a noticeable miss. I replaced the plug on cylinder 4 after swapping another coil without solving the issue. I then swapped the 4 plugs on that side with the stock motorcraft plugs so they are all new coils and plugs on that side. All CEL were gone, was running great. I decided to drive it to the shop to steam off all of the oil from the leak.
This is about a 30 mile drive. About 25 miles into the drive at freeway speed the truck bucks and loses power for a second, nothing else. I step off the throttle and it sounds like a small noise coming from the right side of the car, but seems to be running fine. The oil light flashes for a second and goes off so I decide to get it to the shop to see if I can figure out the problem.
Coming off the offramp to the freeway, the oil pressure light comes on again and stays on for a couple of seconds so I shut it off and coasted to a stop. I checked the oil which was full and restarted. no lights but there is a knock coming from the right side of the motor. I started to go and the oil pressure light came on so I shut it off again got out and looked again, listened and all seemed ok other than the knock.
I drove the 3 miles to the shop with the knock in the engine. As I pulled into the shop the oil light came on again flashed on then off then stayed on so I shut it down again and coasted in.
No check engine lights, no pending codes. My initial thought was rod knock, but talked to a friend who told me the Ford engine was notorious for a bad cam phaser (which looks to be the SOHC not the DOHC) and that a plugged cat can do this.
Any thoughts or tips to diagnose before I put a motor into it?
I pulled the codes and found P0303 (cylinder 3 misfire) and P0300 (multiple cylinder misfire). I also found a hole in the front of the timing cover that was leaking oil, and after some inspection determined the car had been in an accident.
I ordered new coils and plugs, after some research it looked like coils and plugs were a huge ordeal so I thought I would work on just the problem areas. I replaced the coils on the right (1-4) bank and checked the plugs. It had ok looking iridium plugs so I left them. I fixed the hole in the timing cover. I put new 10w-30 oil (even though it calls for 5-20, 10w30 was the closest I had and I generally don't like thin oils).
After this I got a P0354 (coil D primary/secondary failure) code and a P2198 (right bank 02 sensor stuck open), with a noticeable miss. I replaced the plug on cylinder 4 after swapping another coil without solving the issue. I then swapped the 4 plugs on that side with the stock motorcraft plugs so they are all new coils and plugs on that side. All CEL were gone, was running great. I decided to drive it to the shop to steam off all of the oil from the leak.
This is about a 30 mile drive. About 25 miles into the drive at freeway speed the truck bucks and loses power for a second, nothing else. I step off the throttle and it sounds like a small noise coming from the right side of the car, but seems to be running fine. The oil light flashes for a second and goes off so I decide to get it to the shop to see if I can figure out the problem.
Coming off the offramp to the freeway, the oil pressure light comes on again and stays on for a couple of seconds so I shut it off and coasted to a stop. I checked the oil which was full and restarted. no lights but there is a knock coming from the right side of the motor. I started to go and the oil pressure light came on so I shut it off again got out and looked again, listened and all seemed ok other than the knock.
I drove the 3 miles to the shop with the knock in the engine. As I pulled into the shop the oil light came on again flashed on then off then stayed on so I shut it down again and coasted in.
No check engine lights, no pending codes. My initial thought was rod knock, but talked to a friend who told me the Ford engine was notorious for a bad cam phaser (which looks to be the SOHC not the DOHC) and that a plugged cat can do this.
Any thoughts or tips to diagnose before I put a motor into it?