Surging, backfiring, undriveable
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Surging, backfiring, undriveable
So just out of the blue one day while driving to work my truck starts to surge, backfire, buck, all while almost flooring the gas just to keep going. My first guess is that the o2 sensor is probably bad and the cat is probably plugged. I drove the truck a little bit on Sunday and the short trips it did fine. Monday morning on the way to work, I was about 10 minutes out and it starts the same crap again. After it sat 12 hours, it still ran like crap on the way home, didn't think I was going to make it. The codes I pulled were 12, 37 (I don't know why), 32, 32 (again, I don't know why), and finally 55. Any other ideas? i haven't noticed a lot of oil burn and I pulled only two spark plugs but they both looked ok, not perfect but not fouled or oil soaked. When the truck backfires, I hear it pop through the manifold.
1995 Dodge Ram 2500 4X4
5.9 gas engine
178K miles
1995 Dodge Ram 2500 4X4
5.9 gas engine
178K miles
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6 and 8 are the back two on the passenger side. Those are the ones that foul out first when the plenum is blown. (lower than the front, the oil goes to the back, and gets sucked in, and plugs up cats.)
Quick test: Pull the front O2 sensor (physically remove it from the cat) see if it runs any better.
Quick test: Pull the front O2 sensor (physically remove it from the cat) see if it runs any better.
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plugs looked fine, not sooty, not soaked with oil.....they looked like a dry tan, but the truck runs fine for about 10 minutes or so. It's got to be something becoming heat soaked in my opinion, but I just don't know, it's frustrating cause I thought for sure that the coil would've fixed it. I'll try monitoring the fuel pressure next........