A few months ago, my 2006 Eddie Bauer Expedition began hesitating and shuddering at around 45-50mph. It only occurs while accelerating. The hesitation was minor and posed no problem, so I decided to shrug it off for a while until I could get new plugs. The hesitation gradually got worse, as did the shuddering. The engine light blinks indicating a misfire. Eventually the shuddering got extremely violent, and it would occasionally cause the engine to stall. I decided I had no choice but to take her in.
She read as having a misfire in cylinder 8. After getting new spark plugs and coils, the issue still persisted. The misfiring cylinder changed to #4. Since then I've replaced the fuel pump, fuel filter, fuel injectors, and a new fuel pump drive module. Now there's a misfire in cylinder 2, and after running the engine for a while, I removed the new plug and it was spotless. Looked the same as when I took it out of the box. The issue continues to gradually get worse. The issue worsens as the truck gets warmer. If I put my foot to the floor, the RPMs will climb to about 4,000 and linger there as the truck slowly gains speed. Then after a short time the RPMs will drop suddenly, and the check engine light blinks.
No one I talk to seems to be able to diagnose the problem. I've heard that it could be a torque converter issue, transmission issue (which I doubt because the car will shift normally if I don't floor it), or as my regular mechanic mentioned, the engine could be completely shot. Any suggestions?
She read as having a misfire in cylinder 8. After getting new spark plugs and coils, the issue still persisted. The misfiring cylinder changed to #4. Since then I've replaced the fuel pump, fuel filter, fuel injectors, and a new fuel pump drive module. Now there's a misfire in cylinder 2, and after running the engine for a while, I removed the new plug and it was spotless. Looked the same as when I took it out of the box. The issue continues to gradually get worse. The issue worsens as the truck gets warmer. If I put my foot to the floor, the RPMs will climb to about 4,000 and linger there as the truck slowly gains speed. Then after a short time the RPMs will drop suddenly, and the check engine light blinks.
No one I talk to seems to be able to diagnose the problem. I've heard that it could be a torque converter issue, transmission issue (which I doubt because the car will shift normally if I don't floor it), or as my regular mechanic mentioned, the engine could be completely shot. Any suggestions?
