How to test injector clips
01-21-07, 07:13 PM
#1
How to test injector clips
So I am as certain as I can be that my rear primary injector is not getting a signal. It was just cleaned, so that shouldn't be the problem. I replaced all of my injector clips recently, but they all look fine. Is there some way I can just test continuity with a multimeter for the whole circuit from the ECU to injector clip? Would just testing it form the pin on the ECU plug work? And if so, which one should I test with?
01-21-07, 07:23 PM
#2
quotes from HAILERS that helped me: "Should not be a resistor pack on a 88.
Pull the intake off. Unbolt the primary fuel rail. Leave the electrical plugs on the injectors and then zip tie the injectors to the rail.
Jumper the fuel pump check connector and turn the key to ON.
Pull the CAS out but leave its electrical plug on. Spin the CAS bottom gear with the above conditions. The injectors should spit fuel when you spin the CAS lower gear.
One spits and the other does not?? Swap electrical connectors and do it again.
Before doing that, go to the ECU and the applicable wire for the primary injector your interested in. Leave the plugs on the ECU and backprobe the wire for the injector your interested in. Key to ON. You should see battery voltage,. proving the electrical circuit from the battery....to Main Relay ......to the injector..........to the ECU plug is good for that injector.
Make sense? Did to me anyway."
"Your backprobing the injector wire at the ECU to see IF there is 12vdc there or not. That's all. No voltage, then you've a broken connection b/t the injector and the ECU.
IF you spin the CAS and are looking at the two injectors, they should both spit fuel when their turn comes up. If no fuel comes out of one of them, then get a meter out and see if there is 12v available at that injectors plug or not. Got 12v? Then go to the ECU and see if there is 12c there at the wire for that injector.
Got 12v both places? Then swap injector plugs from one primary to the other and try again. IF it now spits fuel, then the injector is good but there is something wrong on the ECU side of things. If fact, if one injector does not spit fuel when you spin the CAS, that is the moment you should swap injector plugs and try again to determine if the it's the injector or the ECU.
I suppose a noid light at the injector might help determine if the injector is pulsing or not. Never done that myself. A meter backprobing the injector wire at the ECU won't show much but if voltage is there or not.
Actually, if the key were to ON and the small plug was OFF the ECU, you could MOMENTARILY touch/short the wire to a given injector and make it pulse. Not recommended for more than a second or so, just to see if it clicks
Say you find that one injector does not pulse when you do what I wrote above. You could go to the ECU and pull the small plug off and go to that injectors wire at the PLUG, and put a gnd on that wire with the key to ON. It should click if you do that and if fuel pressure is in the rail it should flow fuel.
I mention spinning the cas in the above post because that is how the car works in real life and you don't have some plugs off, some plugs on etc. Plus you can visually see if the injector is spraying or not spraying
There's a half dozen ways to see if the injector is working or not. Actually more."
hopefully this helps you.
Pull the intake off. Unbolt the primary fuel rail. Leave the electrical plugs on the injectors and then zip tie the injectors to the rail.
Jumper the fuel pump check connector and turn the key to ON.
Pull the CAS out but leave its electrical plug on. Spin the CAS bottom gear with the above conditions. The injectors should spit fuel when you spin the CAS lower gear.
One spits and the other does not?? Swap electrical connectors and do it again.
Before doing that, go to the ECU and the applicable wire for the primary injector your interested in. Leave the plugs on the ECU and backprobe the wire for the injector your interested in. Key to ON. You should see battery voltage,. proving the electrical circuit from the battery....to Main Relay ......to the injector..........to the ECU plug is good for that injector.
Make sense? Did to me anyway."
"Your backprobing the injector wire at the ECU to see IF there is 12vdc there or not. That's all. No voltage, then you've a broken connection b/t the injector and the ECU.
IF you spin the CAS and are looking at the two injectors, they should both spit fuel when their turn comes up. If no fuel comes out of one of them, then get a meter out and see if there is 12v available at that injectors plug or not. Got 12v? Then go to the ECU and see if there is 12c there at the wire for that injector.
Got 12v both places? Then swap injector plugs from one primary to the other and try again. IF it now spits fuel, then the injector is good but there is something wrong on the ECU side of things. If fact, if one injector does not spit fuel when you spin the CAS, that is the moment you should swap injector plugs and try again to determine if the it's the injector or the ECU.
I suppose a noid light at the injector might help determine if the injector is pulsing or not. Never done that myself. A meter backprobing the injector wire at the ECU won't show much but if voltage is there or not.
Actually, if the key were to ON and the small plug was OFF the ECU, you could MOMENTARILY touch/short the wire to a given injector and make it pulse. Not recommended for more than a second or so, just to see if it clicks
Say you find that one injector does not pulse when you do what I wrote above. You could go to the ECU and pull the small plug off and go to that injectors wire at the PLUG, and put a gnd on that wire with the key to ON. It should click if you do that and if fuel pressure is in the rail it should flow fuel.
I mention spinning the cas in the above post because that is how the car works in real life and you don't have some plugs off, some plugs on etc. Plus you can visually see if the injector is spraying or not spraying
There's a half dozen ways to see if the injector is working or not. Actually more."
hopefully this helps you.
01-21-07, 07:33 PM
#3
Wow, thats a whole lotta info. I kinda skimmed it, and that should help me out. For the record, my car is an early 87 (built 10-86) so it has the resistor pack.
I am fairly certain that my problem is simply just in the wiring. I might try rigging up the injectors tied to the fuel rails to see if its the injector or not, I dunno. I ran out of time this weekend, so it'll have to wait until next weekend now, anyway. Damn ******* job where I only have 3 hours between when I get home and start getting to bed....
I am fairly certain that my problem is simply just in the wiring. I might try rigging up the injectors tied to the fuel rails to see if its the injector or not, I dunno. I ran out of time this weekend, so it'll have to wait until next weekend now, anyway. Damn ******* job where I only have 3 hours between when I get home and start getting to bed....
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