stupid question about injector resistors!!
08-24-07 | 02:38 PM
#2
HAILERS
Joined: May 2001
Posts: 20,563
Likes: 23
From: FORT WORTH, TEXAS,USA
A 88 car did not have a solenoid resistor and does not need one.
1987 1/2 and EARLIER had a solenoid resistor package and you need one for those cars.
1986-1987 1/2 had low resistance injectors of approx 2-3 ohms. The resistor in the package IS 6 ohms. So 6 plus 3 equals about 9 ohms seen by the ECU from the injector.
The 1987 1/2 plus cars had no resistor package BUT, if you read across the two pins on them you will see approx 12 ohms. So the ECU sees approx 12ohms resistance from them.
Sooooo.......if you have a injector of low resistance, like 2-3 ohms, then you NEED to have a resistor in that circuit. IF the injectors have a value of approx 12 ohms, then you do NOT need resistors.
Just measure across the two pins on a injector to see if they are the approx 12ohm ones. If so, no resistor needed.
Usually the TAB/NOTCH on the injectors will indicate if it's low or high. Tf the tab/notch is in the center of the injectors electrical connection, then it's LOW resistance of approx 2-3 ohms. If so you NEED resistors.
IF the tab/notch is OFFSET on the injectors electrical connector, then the injector is most likely of approx 12ohm value and you do NOT need resistors.
In other word the ECU needs to see approx 10-12 ohms resistance coming from the injector side of the circuit. One set of cars used a solenoid resistor package and the newer cars just used injectors of an internal resistance of approx 12 ohms.
Something like that.
1987 1/2 and EARLIER had a solenoid resistor package and you need one for those cars.
1986-1987 1/2 had low resistance injectors of approx 2-3 ohms. The resistor in the package IS 6 ohms. So 6 plus 3 equals about 9 ohms seen by the ECU from the injector.
The 1987 1/2 plus cars had no resistor package BUT, if you read across the two pins on them you will see approx 12 ohms. So the ECU sees approx 12ohms resistance from them.
Sooooo.......if you have a injector of low resistance, like 2-3 ohms, then you NEED to have a resistor in that circuit. IF the injectors have a value of approx 12 ohms, then you do NOT need resistors.
Just measure across the two pins on a injector to see if they are the approx 12ohm ones. If so, no resistor needed.
Usually the TAB/NOTCH on the injectors will indicate if it's low or high. Tf the tab/notch is in the center of the injectors electrical connection, then it's LOW resistance of approx 2-3 ohms. If so you NEED resistors.
IF the tab/notch is OFFSET on the injectors electrical connector, then the injector is most likely of approx 12ohm value and you do NOT need resistors.
In other word the ECU needs to see approx 10-12 ohms resistance coming from the injector side of the circuit. One set of cars used a solenoid resistor package and the newer cars just used injectors of an internal resistance of approx 12 ohms.
Something like that.
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