Hi team,

im kinda at a wits end with my emanage ulitmate i recently got it flash tuned from brian at karcepts and got one of his harnesses along with it i have a obd1 ukdm s2000 when all plugged up car starts and runs fine until i hit vtec it throws a CEL 1-7 which is VSS it then runs funny and fuel cuts at 7000 rpm until restarted, ive checked the loom and the vss is wired up from the emanage and i cant see any issues with the wiring, when running the oem ecu i have no issues at all am i missing something here? can some one chime in im hoping its a simple fix as i cant return it and kinda wasted my $ is there any issue running a obd1 car with the harness from boomslang? i know MugenRioS2k1 knows abit maybe he can chime in too

 

Did you make sure you ran the ground wires correctly if you don't the unit won't work correctly

 

thanks for the reply, with the ukdm cars the ecu is in the passenger side, ive tried a couple grounding locations there's a main one up behind the dash that i cant reach that looks similar to the one on the drivers side , ive tried the ecu bracket spot on the passenger side is there a better location?

 

I used the same ones the oem ECU uses but my car is a USA car so might be different

 

What year is your car?

 

Personally I would reach out to Brian at Karcepts. He has plenty of experience.
I have an 05 US Spec with the karcepts tune on the emanage.
I never grounded mine and it works without issue FYI. IMO you would be getting misfires if it was, not these VSS issues.
Even Brian says: "You don’t have to do this ground tap, so you can try as is and see how it goes. If everything runs smooth without, you are fine. Honestly 50% of the harnesses sold did not have a tap, but those who have added a tap later have reported that things seemed to run smoother."

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ISSUES FROM NOT GROUNDING, from Brian:

"Mainly ignition cuts / misfires. It would be extremely rare to notice anything extreme under acceleration. If you do, then you have a bad EMU. However, when the car is at idle and you listen to the exhaust, you can kind of hear what I mean. It’s pretty normal with the EMU to notice this at idle w/ or w/o the ground, but with the ground it seems to run a little better. It seems to be related to the processing speed of the EMU. You should be fine without it.. Just make sure the EMU is not touching ANYTHING metal."