I'm having a little grounding issue....

My map sensor(hondata 4 bar) is reading 4psi at idle(obviously wrong) so my motor is running extremely rich.

Thought it was an easy fix so i chased the map sensor wires....everything good.

So after pulling all my hair out I pulled my harness out and removed every butt connector and replaced with solder and heat shrink and ran all the sensor ground wires EXCLUSIVELY to the thermostat ground no more piggy-backing.

Checked main relay grounds...all good.

When I turn the ignition off the oil pressure idiot light stays on lightly as well as the ECU

I relocated my battery to the back so my tranny is not grounded directly to the battery, but it is grounded to the chasis(not sure if that is an issue)

EG Chassis
H22 motor
Hondata

I just need other perspectives to throw some ideas at me.
Let me know what extra details you might need to get a better idea of what I've got going on.

Thanks!

 

I would be glad to take any suggestions.

I also own a stock daily driver 95 civic ex; so i will pull out the ecu and check to see if I have the same symptoms.

 

"When I turn the ignition off the oil pressure idiot light stays on lightly as well as the ECU"

I don't know for sure but I thought I might just throw it out, that maybe you are back feeding electricy through your grounding system.

My only off the hip idea.

Check to see if you see voltage grain at the battery which I assume you are after the car is turned off.
Then check to see if you have any wires that are cut open / fray'd also check for wires that may have rubed together throuhg their insulater.

 

yea I think i'm gonna bring a draw tester home with me to play with, hopefully it will help me trace things down.

 

ok so i traced every wire coming from the ecu.(tons of fun) made sure all of the main relay wires were correct. Ignition is good. Plugged everything back up and map sensor still reading 4 psi and idle, WTF! It's a hondata map with omni throttle body, so I think I'm gonna hook up the factory map with a vacuum and see if the reading is different.

Another thing I was kinda confused on was Logic Ground aka sheilded wire aka LG1.
Where exactly is that supposed to be hooked up at?
I have the sheild over the dizzy wires connected the the thermostat ground as well as the sheild wire around the ecu.