Simple favor (engine grounds)
#1
Simple favor (engine grounds)
So I installed a 1.8 engine in my 90 miata(retaining the 1.6 wiring harness) and it runs okay but i think i may have a grounding issue, it being my megasquirt likes to randomly reset sometimes. Would someone be so kind as to describe to me what the wires look like that are the engine grounds for the 1990 wiring harness (black w/stripe, green w/polka dots,etc...) Or even better a picture would be amazing. ThankS!!
#10
Time to zombiefie another ancient thread :P.
I've done a 1.8 swap into my '93 miata and I'm having some problems.
The symptoms are pointing towards a faulty ECU coolant thermosensor.
I've replaced it with a new one and measured the resistance of the old one, which was still fine.
Now I'm thinking I might have messed up some of the grounds.
The wiring schematic indicates the two grounds in the rear go on the back of the engine, but I've wired one to the firewall.
Is the firewall an acceptable place to ground this wire or is it in fact the cause of my problems?
I've done a 1.8 swap into my '93 miata and I'm having some problems.
The symptoms are pointing towards a faulty ECU coolant thermosensor.
I've replaced it with a new one and measured the resistance of the old one, which was still fine.
Now I'm thinking I might have messed up some of the grounds.
The wiring schematic indicates the two grounds in the rear go on the back of the engine, but I've wired one to the firewall.
Is the firewall an acceptable place to ground this wire or is it in fact the cause of my problems?
#11
It's a pretty easy thing to check with a multimeter, but if you are worried why not move it?
Anytime you ground something at a different location you create a resistor, the effect is dependent on system. If you ground a fan somewhere, it doesn't care. If you ground an ecu somewhere and the sensor somewhere else you can create a voltage offset.
Anytime you ground something at a different location you create a resistor, the effect is dependent on system. If you ground a fan somewhere, it doesn't care. If you ground an ecu somewhere and the sensor somewhere else you can create a voltage offset.
#15
Is the sensor return wire pin 7 on the mainboard connector or there other pins as well? I'm just curious because I have my aem wideband grounded at the same spot on the engine head as the MS but I am getting a discrepancy of .3 on TS from my wideband gauge. I would like to get the gauges to match up correctly.
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