danielp3344
Member
- Joined
- Oct 15, 2020
- Messages
- 60
- Reaction score
- 12
- Points
- 8
- Location
- Maryland
- Vehicle Year
- 1988
- Make / Model
- Ranger, 4x4
- Engine Type
- 2.9 V6
- Transmission
- Manual
- 2WD / 4WD
- 4WD
- Tire Size
- 32/11.5R15
So I finally got my speeduino working pretty well (hopefully I'll get a writeup on here soon), but I'm having a weird issue. I replaced the stock coil with an LS1 type coil with an internal igniter. I connected the dark green/yellow wire that used to go to the coil power to the igniter signal on the LS1 coil (so basically the same setup as factory). The tach responds very well, but reads low. it hovers below 0 at idle, 0 seems to be about 1000 rpm and 1000 on the tach seems to be right about 2500 from the engine. Any ideas? This ECM has a dedicated tach output but it doesn't seem like I should need it here. For what it's worth I found an old video I took from before the ECM swap and the tach worked normally then.