Swordfish94x
Active Member
- Joined
- October 2, 2011
- Messages
- 56
- Reaction score
- 0
- City, State
- CA
- Year, Model & Trim Level
- 1996 4dr 2wd Explorer
Hey all,
Been a while since I've been on here, but you've helped me in the past so why not try again. My 96 4.0 was running great with almost 150k on it. I went to dinner one night and stopped by my buddies house on my way home. When I started it up, could almost immediately tell is was missing. It misses at idle, and basically when it's not under any load. It doesn't seem to miss much under a light acceleration, but it doesn't like to hold the same speed. It misses the most when It's idling and I rev it, or when I let off the gas just a little.
Fast forward a few days and it finally gave me codes P0300, P0351, and P0353. My buddies scanner said it was the ignition coil, replaced that and didn't help at all. I checked all the plugs and wires and everything seems to look fine. Few more days go by and now its throwing P0122. I checked the throttle position sensor with ignition in the run position. Ground came out with like 12.5v, referance came out with 5v, and signal wire went from like .98v up to ~4.7v with no breaks or jumps going either way. Mass air flow seems to be fine, can't find a vacuum leak anywhere, and I don't see any burnt, broken, or corroded wires.
After all this I'm beginning to believe my PCM is bad. I'm kind of out of other ideas. Is there any way to test the PCM other than just like a smell test? Please, I could use some guidance.
Been a while since I've been on here, but you've helped me in the past so why not try again. My 96 4.0 was running great with almost 150k on it. I went to dinner one night and stopped by my buddies house on my way home. When I started it up, could almost immediately tell is was missing. It misses at idle, and basically when it's not under any load. It doesn't seem to miss much under a light acceleration, but it doesn't like to hold the same speed. It misses the most when It's idling and I rev it, or when I let off the gas just a little.
Fast forward a few days and it finally gave me codes P0300, P0351, and P0353. My buddies scanner said it was the ignition coil, replaced that and didn't help at all. I checked all the plugs and wires and everything seems to look fine. Few more days go by and now its throwing P0122. I checked the throttle position sensor with ignition in the run position. Ground came out with like 12.5v, referance came out with 5v, and signal wire went from like .98v up to ~4.7v with no breaks or jumps going either way. Mass air flow seems to be fine, can't find a vacuum leak anywhere, and I don't see any burnt, broken, or corroded wires.
After all this I'm beginning to believe my PCM is bad. I'm kind of out of other ideas. Is there any way to test the PCM other than just like a smell test? Please, I could use some guidance.