I learned a couple weeks ago that...
Voltage = Current x Resistance
..I also learned that splicing wires will increase resistance...so will this in turn increase voltage???

The reason why I ask is cause I cut ALL the ECU wires in an attempt to convert to obd1...but it didnt work, so I put everything back to obd0...now im having little problems with the TPS and gas mileage...

 

From what electrical knowledge I have, nothing will increase voltage except some kind of regulator. If Resistance goes up, current will go down, but voltage should remain constant. If you're connections are poorly made and cause high resistance, then you're current will go down possibly causing electrical problems.


[Modified by 9integra2, 5:56 AM 11/21/2002]

 

This is exactly true.... Your voltage through the wire will never go up unless the source is changed.. Splicing into a wire breaks down the wire so that more current will have to travel through less strands... For basic sensors there is not too much to worry about since the current level isn't really high. Whenever I'm tappin off of a line i just remove a small section of the insulation then solder the new line on.... Besides giving a better connection there is no effect on the main wire. Peace

 

For each connection, and for the wire itself, there will be a small voltage drop. For example, measure the voltage at teh battery, and then measure it somewhere else, say the starter, it will be less voltage. The main ways to increase voltage is with a transformer and/or coil (for example your ignition coil)

 

Exactly right! Your voltage is your constant....increasing resistance will lower current. Think of it like a garden hose. When you connect your battery it's like turning on the water. If you squeeze the hose you apply resistance slowing the flow(current). But this shouldn't be an issue if your connections are good. When you splice other accessories onto a wire they may draw some current away causing increased resistance or a poor connection may also cause resistance. If you properly solder the wires you will lose little to no current. Recheck your connnections.

 

we have a winner!!!!

bad solder joints = confused ECUs

t..

 

so would any of this cause my car to have bad gas mileage?

 

you have a voltage drop across any resistance. Look at you Ohms law equasion. Think of a voltage divider. You'll see your voltage is affected. How much depends of how much current is flowing. True its small but anything CAN affect you. Although it may be hard to notice.

 

was the bad gas milage there before you did some splicing?

t..

 

I really cant say...I took this obd1 motor out of my old 92LS, which had great gas mileage. I wanted to put it in my crx as obd1, I cut all the wires and everything, but did not work out. So I settled with obd0. Maybe it's my tranny?? I have a jdm J1 tranny on the LS. FYI, I get about 180 miles on a full tank...I dont know if this is good or what.

 

does it have O2 sensors?

are there any codes?

what ECU is it?

t..