Neither the Cold Start Injector nor the Cold Start Injection Timer are receiving power with the ignition ON for my 3vze. The result is very hard starting in cold weather. Can you please tell me from where the power for these two components is sourced? From the schematic I have looked at here:

http://img823.imageshack.us/img823/6...ewdpowerso.png

it seems like the power comes from the IH1 connector via the Starter Relay. To be totally honest I am very confused on how this circuit works. From the research I have done, it looks like the IH1 is a wiring junction located on the passenger foot well? Any help is greatly appreciated.

 

I know a quick solution, have you checked your fuses?

 

All fuses are fine...

 

Anyone??

 

It's highly unlikely to be a fuse issue because otherwise his starter would be affected as well. You are correct that it comes through IH1 but this is unlikely to be the source of your problem because starter contactor power is also through that same connection. You don't say if you have a MT or AT, but I'd guess you have a MT. In that case, start at IH1 and find the splice point where it branches right after IH1. Splice points are typically the source of problems, but you may have to follow it all the way through to and find a wire break. Since neither the injector OR the timer are getting power, you're probably narrowing it down to that single wire (right below the IH1 connector labeled with 15) or the splices at either end.

 

Thanks for the info, Jerry. The rig is Auto Transmission. Sorry 'bout that. Alright well it is nice to know I'm on the right track. The two components should then always have power with the ECM controlling them via the ground, right?

 

Hm, I'm not sure. The difference with an auto transmission is that your park/neutral switch is wired in there too, so check the wiring from that switch.

As far as whether the ECM controls it, I don't believe so. The ECM can SENSE whether the timer is still running, but the timer itself controls the injector.

 

Looks like the power comes from the ignition switch and then through the nuetral safety switch.

 

Alright well this is what I found:

It appears that both the Timer and the Injector receive power only during cranking, and that the Timer controls the Injector via closing the injector's ground to the timer's case. Once the switch is warmed, it will no longer close the ground during cranking.

In my situation, I had fuel coming to the injector, and I had power during cranking. I decided to take the injector off to have a look and found that it was completely covered in carbon. I cleaned it, tested the injector by leaving it out of the intake, and found a nice spray of even fuel. I will test its function tomorrow in the near freezing cold...

Thanks for the input guys!!

 

Now you're making me want to do this during the weekend

 

let me know if you have questions. as you probably well know, it seems the wiring on these trucks is rather bulletproof, so I was very happy to discover it was not a wiring issue