About 2 weeks ago, my 2005 Dodge Ram 1500 4x4 was running fine. The very next morning, it’s 4.7l engine has a very obvious misfire situation where it’s hesitating badly, especially under acceleration at lower rpms, with the shaking feeling in the steering wheel etc etc. I have Advanced Auto parts and 2 separate auto shops plug in their little boxes to find the problem codes. The check engine light came on and stayed on as soon as this issue began. The codes they got were consistent from place to place: 1. Misfire on cylinders 4 & 6, and 2. Random multiple misfire.
So I go and buy 2 brand new coils for cylinder 4 and 6, and 8 new champion plugs. I was in Florida for a week, so the truck was NOT driven at all after the day this problem began. So I replace all 8 plugs and install the 2 new coils, but it makes NO DIFFERENCE. It’s still hesitating just like before. Today I take it to Goodyear to have them do an allegedly thorough evaluation. They use their little code box and they get the same codes as mentioned above about random multiple misfire and misfire on cup 4 and 6.
Then the mechanic takes the truck for a ride and experiences the same hesitation and shaking under acceleration. So he replaces both of the new coils I had installed with their coils and replaced the 2 new plugs, just to make sure there was no issue with these new parts. He takes it out and apparently plugs in a different computer that monitors all engine functions, including air/fuel mixture, spark etc. According to that computer, the truck is running properly(according to them), and he checks compression and says it’s good. So they have no idea what’s wrong, and he said that my car’s computer was reset so the check engine is no longer on(I am not clear the how’s and whys of that part). But the important thing is that it’s still running badly and they can’t tell me why it’s running badly!
The mechanic said maybe a lifter collapsed or there is sludge that’s causing an issue, but no solid explanation. Supposedly the 4.7L Dodge engine has a sludge issue experienced by some owners, and the mechanic recommended replacing the oil every 1500 miles instead of 3000.By the way, I asked how much it would cost for Goodyear to check the lifters and check under the valve cover, but he said they don’t do that.
Ok. This leaves me $200 short after buying the parts 2 days ago and then paying Goodyear to evaluate it, but I am no closer to an answer. If you have any questions let me know and I’ll answer them if it helps. Thanks in advance…