I'm having an issue where Tunerpro RT will start getting connection errors shortly after starting the engine. When this happens the dashboard freezes and datalog data is all flat lines.
A short description of the car/setup: it's a 94 Mustang with EECV, modified stock harnesses, and coil near plug. Since it only occurs after the engine is running I am thinking EMI noise.
Thinks I have done or checked:
Used stock harnesses in attempt to keep stock powers and grounds
Coil powers used from a stock 4.6L harness, so it has the ignition capacitor connected to ground
Tried every USB cable I own, with and without ferrite bead and different lengths. I have ordered a high quality one to try next
Tested with coil power directly connected to battery ie not through harness or on ECU powers
Tested with extra ground from engine to chassis
Tested with alternator disabled
Confirmed EECV grounds and case ground
Cam sync and crank position wiring is twisted pair with shielding connected to ground at ECU end
Latest FTDI driver
Tried multiple driver latency values
Tried several different ADX files, but all released ones from Decipha
Verified Tunerpro settings match "Getting Started" writeup
Car is mainly a racecar so a lot of wiring and components have been removed (HVAC, radio, air bags, etc)
Anything that I am missing or other things to try/check? Are there known troublesome input pins? I'm at the point of trying to wrap the USB cable or the ECU in tin foil to help shield.
Well aluminum foil didn't help. Sometimes it errors out immediately after startup sometimes it's like 30 seconds. Tried to see if related to switch from OL to CL, but that doesn't seem to correlate.
Moates isn't around anymore. If I can find and fix the EMI issue then don't need some other component.
Change out the battery in the QuarterHorse.
Use an extension cord to power your laptop.
Don't use the car power thru an inverter to power laptop.
Try a different laptop.
Moates are gone but EMI has not. They produced the optoisolator to overcome difficult environments. They also produced a bluetooth module which achieved the same result. The Moates Bluetooth was just a generic HC05 dongle.
On my setup I routed the usb cable nicely under the glove box zip tied to the metal under dash. That caused an issue for my setup. So I went back to it laying on the floormat. My point is try changing the route of the usb cable if you have not already.
Laptop is running on battery. Familiar with ground loops.
USB cable is just sitting on floorboard at the moment.
I'm going to use a portable AM radio today to try to narrow down noise source. Also going to try a ferrite bead at both ends of the USB cable. The USB bluetooth option is interesting, I'll look into that.
Won't say it's completely fixed but I am able to datalog for longer than 30 seconds now. So I'll call that a win!
I added a second ignition capacitor to the passenger side coils wire. I had the one on the drivers side already. I noticed in the wiring diagrams Marauder's called out one on each side. Dug through my collection of wiring harnesses and found another one to add to my harness on the passenger side. Interestingly the F150 harness that I had also had two capacitors.