Weird injector problem...
07-15-2005, 08:15 PM
#1
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Car Info: 02 Black Legacy GT
Weird injector problem...
So I am trying to get my car dialed in for the Hammy meet. Here is what is happening.
The car runs on 2-cylinders. Runs well and sounds almost normal. Only the back cylinders are working (3 and 4). I have spark on all 4. Injectors are not firing on 1 and 2.
When I disconnect either one of the rear cylinder injectors, the front ones (1 and 2) start working.
So, as is, with every injector harness plugged in, the car only fires injector 3 and 4. if I disconnect 3, then 1, 2 and 4 are firing. If I disconnect 4, then 1, 2 and 3 are firing.
What gives?
The car is a 02 WRX with SPEC C motor and ECU.
The car runs on 2-cylinders. Runs well and sounds almost normal. Only the back cylinders are working (3 and 4). I have spark on all 4. Injectors are not firing on 1 and 2.
When I disconnect either one of the rear cylinder injectors, the front ones (1 and 2) start working.
So, as is, with every injector harness plugged in, the car only fires injector 3 and 4. if I disconnect 3, then 1, 2 and 4 are firing. If I disconnect 4, then 1, 2 and 3 are firing.
What gives?
The car is a 02 WRX with SPEC C motor and ECU.
07-16-2005, 01:40 AM
#4
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wow, are you getting a different voltage from the injectors when 2 fire then when 3 fire? have you ohm'ed out all the grounds? Also, if you have just 3-4 plugged in can you get either 1 or 2 to fire if you unplug either one? just tryingt o isolate if it has to do specifically with 3-4 or if you can just run any 3 injectors at once. If the voltage stays the same when its running 2 or 3 and you ohm out even on all leads I would try another ECU, Mike has a couple
07-18-2005, 05:30 PM
#5
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Ok, I figured it out. Funky yet exciting...
I knew that everything (injectors, all sensors and stuff) had one common ground. However, I did not know that not having something plugged in would cause a sporadic ground. In my case, since I am using a Mustang 75mm throttle body, I was not using the OEM idle control motor. I guess the idle control motor is a pass through circuit so when it was disconnected, there was a “bad” ground so the 1 and 2 injectors would shut off.
Go figure. Since I converted from TEC III, this whole stock ECU thing is totally new to me...
I knew that everything (injectors, all sensors and stuff) had one common ground. However, I did not know that not having something plugged in would cause a sporadic ground. In my case, since I am using a Mustang 75mm throttle body, I was not using the OEM idle control motor. I guess the idle control motor is a pass through circuit so when it was disconnected, there was a “bad” ground so the 1 and 2 injectors would shut off.
Go figure. Since I converted from TEC III, this whole stock ECU thing is totally new to me...
07-18-2005, 06:22 PM
#6
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iTrader: (21)
Join Date: Sep 2003
Location: in a glass case of emotion.
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Originally Posted by Imprezer
Ok, I figured it out. Funky yet exciting...
I knew that everything (injectors, all sensors and stuff) had one common ground. However, I did not know that not having something plugged in would cause a sporadic ground. In my case, since I am using a Mustang 75mm throttle body, I was not using the OEM idle control motor. I guess the idle control motor is a pass through circuit so when it was disconnected, there was a “bad” ground so the 1 and 2 injectors would shut off.
Go figure. Since I converted from TEC III, this whole stock ECU thing is totally new to me...
I knew that everything (injectors, all sensors and stuff) had one common ground. However, I did not know that not having something plugged in would cause a sporadic ground. In my case, since I am using a Mustang 75mm throttle body, I was not using the OEM idle control motor. I guess the idle control motor is a pass through circuit so when it was disconnected, there was a “bad” ground so the 1 and 2 injectors would shut off.
Go figure. Since I converted from TEC III, this whole stock ECU thing is totally new to me...
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