What causes an error code for Fuel Injector #1?

[87e30]

Hello again guys... I know I have started quite a few trouble threads. I feel like I'm narrowing things down, but I'm not sure what eles to try for this.

My car is still throwing a code for fuel injector #1. I have replaced the ECU, complete obd2 wiring harness, and swapped around the fuel injectors a couple times.

Aside from sifting through the wiring adapter from x20 to c101 (which I'm also trying to do, however I purchased a pre-made one so this isn't exactly my strong point) what else would you recommend doing? Basically, what are the causes for this code?

The car runs and drives fine for about a minute or more, then the computer seems to realize this code is there and the car hesitates and stumbles.

[e30s52]

Buy this....

http://www.r3vlimited.com/board/showthread.php?t=162504

Did you find out why you were popping fuse #9?

[87e30]

Buy this....

http://www.r3vlimited.com/board/showthread.php?t=162504

Did you find out why you were popping fuse #9?

:rofl:

Yes, the adapter had pin 6 (which comes from fuse 9) wired directly to the starter instead of fuse 15 as it was supposed to. So I have that sorted out, still problems with the fuel injector code though...

I would check through the adapter for this issue as well if I had any idea what pins I would be looking at or something else.

I just figured it's possible my issue was coming from something else. (Like maybe the fuel system itself can have a problem that results in the injector not getting fuel or something? I dunno)

[e30s52]

Try swapping the #1 injector with #6 and see if the problem follows the injector. That will tell you if it bad or not. If the injector is good then the problem is in the wiring or maybe the rail some how.

[87e30]

My car is still throwing a code for fuel injector #1. I have replaced the ECU, complete obd2 wiring harness, and swapped around the fuel injectors a couple times.

.

[e30s52]

.

Lol sorry. Trace the wires out and make sure everything is ok with the harness.

[87e30]

Lol sorry. Trace the wires out and make sure everything is ok with the harness.

I just replaced it man, everything seems fine. :???:

The only weird thing is that purge valve is clicking, but I just removed the charcoal canister so that might be way.

Do I need to bleed the fuel lines or something? I just remembered there was a bleeder valve on the rail, though I thought I pushed it in until fuel started coming out already. So pretty sure that's not the problem.

[dranttna]

back probe you injector plug. it seems like you have high resistance in the wire. you cant ceck it by ohming it out, you have to have current flow and measure the availible voltage at the plug. just turn the key to acc. then put a fused jumper wire in the dme plug for that injectors ground and ground it somewere. with the dmm probe the power wire (if its less than 12v theres high resistance) then probe the ground side (if there is more than 0.5v these is high resistance on the ground side of the circuit). i might not have explained this very well since its alot to type with a ps3 contoller so pm me if you need more info.

[87e30]

back probe you injector plug. it seems like you have high resistance in the wire. you cant ceck it by ohming it out, you have to have current flow and measure the availible voltage at the plug. just turn the key to acc. then put a fused jumper wire in the dme plug for that injectors ground and ground it somewere. with the dmm probe the power wire (if its less than 12v theres high resistance) then probe the ground side (if there is more than 0.5v these is high resistance on the ground side of the circuit). i might not have explained this very well since its alot to type with a ps3 contoller so pm me if you need more info.

Umm, I'm actually very confused. But you'll have to excuse me, I'm not familiar with this wiring stuff. I'm impressed you wrote that much witha ps3 controller, :rofl: .

I don't know what a fused jumper wire is, nor do I know what the dme plug is. Is that simply the connector the injector plugs into on the harness (which is the plastic box along the fuel rail).

As I read this I think I might be starting to understand. If you are talking about the plug that the injector plugs right into. I would touch a wire to one plug and then touch a "probe" to the other little metal plug.

Which is ground? Which is positive? What is the probe?

[Adrian_Visser]

The injectors should always have 12V at one terminal. The injectors fire when the DME closes a switch to ground. If you connect one probe of a multimeter set to dc volts to the correct terminal of the #1 fuel injector connector and the other probe to a ground on the chassis you should get 12v. If less voltage is present you have a high resistance going through a connector or wire somewhere. I suggest you download the damn wiring diagrams and learn something for yourself.

[87e30]

The injectors should always have 12V at one terminal. The injectors fire when the DME closes a switch to ground. If you connect one probe of a multimeter set to dc volts to the correct terminal of the #1 fuel injector connector and the other probe to a ground on the chassis you should get 12v. If less voltage is present you have a high resistance going through a connector or wire somewhere. I suggest you download the damn wiring diagrams and learn something for yourself.

I have the wiring diagrams. I am not in direct contact with anyone who understands them and simply looking at them myself doesn't make a whole lot of sense to me, sorry. I know I'm not very good with this kind of thing.

Thanks for any help.

On a side note, if I've replaced the ECU and the wiring harness with known good units shouldn't everything be fine?

Is there any where in the adaption to the c101 that some mis wiring could cause some problems?

[Adrian_Visser]

Well I'm no expert by any means but the wiring to the individual fuel injectors doesn't go through c101/x20, and there isn't an individual ground for each injector just the main ground for the DME so that is a strange problem to have re-occurring if you have changed the injector, harness and DME, what else is left to change?

I think this post may have been directed to this thread...

did you reset your dme with a peak reset tool or equivalant? i don't care how many injectors or harnesses you replace, if you don't reset the code in your dme, it will never go away. i think it is very common to see injector 1 failure with a swap. i had it too. in everything i read above, i didn't see anything about you mentioning resetting your codes.

[87e30]

Well I'm no expert by any means but the wiring to the individual fuel injectors doesn't go through c101/x20, and there isn't an individual ground for each injector just the main ground for the DME so that is a strange problem to have re-occurring if you have changed the injector, harness and DME, what else is left to change?

I think this post may have been directed to this thread...

Thanks for quoting that post, yes I have reset the codes. After every time I have replaced something. (The canbus timeout code and check engine light code don't go off, but that's because the computer instantly recognizes those codes I'm guessing -- also don't think it's a problem)

Exactly, what else is left to be going wrong? Check fuel pressure? Bleed fuel lines? (noticed a bleed valve on the fuel rail) Maybe change the fuel rail?? I guess that's the only thing left...

[dranttna]

did you splice the speed signal into the ecu plug? if so you might have done it on the wrong wire. im not sure how the ecu or obc calculate the fuel econo but if its based off injector puls width and rpm then that might have something to do with it if thats conected wrong. im not sure, there are many pple here though that should know

[87e30]

did you splice the speed signal into the ecu plug? if so you might have done it on the wrong wire. im not sure how the ecu or obc calculate the fuel econo but if its based off injector puls width and rpm then that might have something to do with it if thats conected wrong. im not sure, there are many pple here though that should know

I didn't have it connected before and I spliced it right back into the speedometer and the code and rev limiter have gone away.


Fuck, I remember one cyl was a little low on compression like 170 or 180 I just don't remember which one it was. Fuuuuuck. This car is so stupid.