big hammer

Noticed this today... the engine rpm logged waves up and down. At one shift it never even logged the throttle being released on the TPS. The injector duty cycles, NB MV’d and injector data stays constant during the waving RPM. Anyone else experience this?

foxsl

iTrader: (1)

This sounds like it could be a grounding issue. Is your battery in the trunk or in the engine bay. If it's in the trunk, there should be a ground from the negative terminal of the battery to the engine block directly. Grounding issues extend themselves to scanner data as the sensors go silly.

truckdoug

iTrader: (25)

Mine does that same **** when one of my USB ports was going out

big hammer

No all stock grounds. But it’s a C word to get logging with the WB hooked up. Keeps dropping off. The WB is grounded to the battery

big hammer

I tried all of my USB ports it’s a fussy ****

truckdoug

iTrader: (25)

maybe try a new USB a to b cable? i wanted a longer one and the cheap *** replacement i got would drop channels

areyou logging w/bthru the mpvi inputs? that little adapter thing the screw can back out so i loctite em after putting the wire in

foxsl

iTrader: (1)

I'm assuming you have hpt pro with the green panel of possible wire inputs. So just making sure your analog output from your wideband harness is going to mpvi slot 1 and your analog ground from your wideband harness going to mpvi slot 5, as far as clearing up wideband related things go. If that's what you have and still see issues, run an additional ground wire from your negative battery terminal to your mpvi ground slot #5.

truckdoug

iTrader: (25)

i usually splice into the obd ground. its a direct pcm ground.

foxsl

iTrader: (1)