SteveMax15
Member
2015 Expedition Limited MAX with 60K. 3.5L Twin turbo v6. 6 speed trans.
Prior to a long trip i replaced the oil and filter after only 3,000 miles, and the engine air filter which had maybe 10,000 miles on it. The air filter, the old oil were not too bad. Between snow trips and trailer towing, "big blue" works pretty hard and I keep up on oil changes, brakes, tire pressure, etc.
Heading out on the first real drive after oil service, The coil pack went out on Cyl #1 and my OBDII tool showed a P0301 code (CYL #1 misfire). I was down to one cylinder and we limped home on 5 cyl. We stopped into my local auto parts and bought a coil pack. I swapped the original COPs on 1 and 2 and confirmed a P0302 error (my problem moved from cyl 1 to cyl 2 confirming a failed COP pack). I replaced the pack and cleared the codes and we headed out on our trip with the engine running smooth. I'm quite certain that COP was bad.
On our trip (day 2) we were heavily loaded but not towing. Accelerating uphill at WOT at 4500 RPM the engine stuttered and threw a code. P0305 and P0304. Misfire on cyl 4 and 5. The problem went away after we pulled over to read the OBDII system. I've reproduced the problem several times now. The misfire is typically registered on different cylinders now. and I'm starting to believe it's a fuel starvation issue at WOT.
Fuel starvation is a good guess and an expensive fix on this car. I'm here to ask a couple of questions before I pursue an expensive fix.
1. Do I understand correctly the fuel filter is contained in the fuel pump INSIDE the gas tank? The F150's of this year, engine, trans all have an external fuel filter... but the Expedition does not. Can someone confirm?
2. Could I have introduced a problem with noob-service mistakes doing my first ever air filter change? I pulled the MAS O2 sensor out to change the air filter. It's running fine at low throttle. I dunno, I'm hoping for an easy fix. I should just recheck all my work here. It's weird that all was well until I did an oil and air-filter change. Right?
3. Are there other things to check first? Exhaust O2 sensors? PCV valves? Wiring?
... any thoughts on how to troubleshoot this better are appreciated.
Prior to a long trip i replaced the oil and filter after only 3,000 miles, and the engine air filter which had maybe 10,000 miles on it. The air filter, the old oil were not too bad. Between snow trips and trailer towing, "big blue" works pretty hard and I keep up on oil changes, brakes, tire pressure, etc.
Heading out on the first real drive after oil service, The coil pack went out on Cyl #1 and my OBDII tool showed a P0301 code (CYL #1 misfire). I was down to one cylinder and we limped home on 5 cyl. We stopped into my local auto parts and bought a coil pack. I swapped the original COPs on 1 and 2 and confirmed a P0302 error (my problem moved from cyl 1 to cyl 2 confirming a failed COP pack). I replaced the pack and cleared the codes and we headed out on our trip with the engine running smooth. I'm quite certain that COP was bad.
On our trip (day 2) we were heavily loaded but not towing. Accelerating uphill at WOT at 4500 RPM the engine stuttered and threw a code. P0305 and P0304. Misfire on cyl 4 and 5. The problem went away after we pulled over to read the OBDII system. I've reproduced the problem several times now. The misfire is typically registered on different cylinders now. and I'm starting to believe it's a fuel starvation issue at WOT.
Fuel starvation is a good guess and an expensive fix on this car. I'm here to ask a couple of questions before I pursue an expensive fix.
1. Do I understand correctly the fuel filter is contained in the fuel pump INSIDE the gas tank? The F150's of this year, engine, trans all have an external fuel filter... but the Expedition does not. Can someone confirm?
2. Could I have introduced a problem with noob-service mistakes doing my first ever air filter change? I pulled the MAS O2 sensor out to change the air filter. It's running fine at low throttle. I dunno, I'm hoping for an easy fix. I should just recheck all my work here. It's weird that all was well until I did an oil and air-filter change. Right?
3. Are there other things to check first? Exhaust O2 sensors? PCV valves? Wiring?
... any thoughts on how to troubleshoot this better are appreciated.