Chillin Dylan
OBS Enthusiast
Hey all. I’ve got a 97 454 5 speed 4x4 truck. I just bought the truck back in January. It’s a little crusty(-er than I thought, ugh) but it ran great. It has a new parts store crate motor in it, less than 6k miles. The only issue it had engine wise was a crank to cam sensor code. But it ran great, like rolling burnout in second gear great, so I didn’t mess with it.
I knew I wanted to put a towing cam in it, so I decided to go ahead and do the 0411 swap so I could tune it with my HPTuners when the time came. I’m a fairly experienced tuner. I worked with Lextech, got the wiring schematic, and a pre tuned ECU from him. Did the pinning, plugged in the ECU, and it’s been nothing but issues since.
I have checked and re checked, checked again, and re checked again my pins. They’re all correct. And I checked on different days too so I wasn’t in the zone with tunnel vision. The fueling is all wrong. It’s lean as **** sometimes and rich as hell others. It basically won’t idle by itself, won’t start without flooring the pedal to enable flood clear, it’s just all wrong. If I use my HPT scanner special functions to force closed loop learning, it runs MUCH better. Actually it runs almost well enough for the self learning to totally sort it out. It has the same crank to cam code, a crank position sensor code, and a MAF code ever since the ECU swap. Even if I could perform the crank re learn properly with it running so poorly, it won’t take because of the crank to cam code.
I’ve seen some guys loosening the distributor and basically turning it back and forth a little until the code doesn’t trip and then locking it down..? One guy showed drilling a damn hole in his distributor to look at the spark..... that seems like a terrible idea to have a hole near a live spark in the engine bay. As for the MAF code I have no idea, it wasn’t an issue before the swap, and I did nothing else besides the swap, and it all happened within a couple days.
Do you guys have any ideas? I’ve been in contact with lextech about it and we can’t figure it out. He went as far as sending me another pre tuned ECU to eliminate the possibility that the first ECU has a hardware issue internally. It made zero difference when I swapped the ECU to the second one.
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I knew I wanted to put a towing cam in it, so I decided to go ahead and do the 0411 swap so I could tune it with my HPTuners when the time came. I’m a fairly experienced tuner. I worked with Lextech, got the wiring schematic, and a pre tuned ECU from him. Did the pinning, plugged in the ECU, and it’s been nothing but issues since.
I have checked and re checked, checked again, and re checked again my pins. They’re all correct. And I checked on different days too so I wasn’t in the zone with tunnel vision. The fueling is all wrong. It’s lean as **** sometimes and rich as hell others. It basically won’t idle by itself, won’t start without flooring the pedal to enable flood clear, it’s just all wrong. If I use my HPT scanner special functions to force closed loop learning, it runs MUCH better. Actually it runs almost well enough for the self learning to totally sort it out. It has the same crank to cam code, a crank position sensor code, and a MAF code ever since the ECU swap. Even if I could perform the crank re learn properly with it running so poorly, it won’t take because of the crank to cam code.
I’ve seen some guys loosening the distributor and basically turning it back and forth a little until the code doesn’t trip and then locking it down..? One guy showed drilling a damn hole in his distributor to look at the spark..... that seems like a terrible idea to have a hole near a live spark in the engine bay. As for the MAF code I have no idea, it wasn’t an issue before the swap, and I did nothing else besides the swap, and it all happened within a couple days.
Do you guys have any ideas? I’ve been in contact with lextech about it and we can’t figure it out. He went as far as sending me another pre tuned ECU to eliminate the possibility that the first ECU has a hardware issue internally. It made zero difference when I swapped the ECU to the second one.
Sent from my iPhone using Tapatalk