I have been having problems starting my 1986 IROC-Z 305 TPI. I have to crank the engine 2 to 3 times to get it to start. I checked the Ohm's on the cold start injector and I only get 4.1 Ohms and on all the other injectors I get 16 Ohms.

Since the Cold Start Injector is just another injector, it should be bad. I'm I correct?

Can anyone give me more information on trouble shooting a cold start injector?

 

the cold start is an on off solenoid with a nozzle. It is a low impedance coil and should be 3 to 4 ohms. IT IS NOT AN INJECTOR it does not pulse just opens when the cold start switch is commanded to do so from the ECU . There is a cold start relay and a temp sending unit ,, check them by seeing if you have 12 volts at the valve when cranking with a cold engine.

 

irocuroc, where can I find the cold start relay?

 

Standalone system independent from ECM control.Just a switch and the injector
See
http://www.austinthirdgen.org/mkport...ine_wiring.gif

No relay
When cranking , power goes to the cold start switch located at front of intake then to injector.
Make sure you have 12V in/ out of the switch when cranking cold engine.If not switch is kaput
CSI switch shown to left of one circled

 

You circled the coolant temp sensor. The cold start injector switch is the large one to the left of the coolant temp sensor. Edit: Ah... you did mention it's the one to the left of the circled one... I missed that when I first saw your post.

The cold start injector switch is a temp "sensor," similar to the coolant temp sensor or a fan switch. And when the engine temp is below 95*, the switch triggers the cold start injector, actually called the cold start injector valve.

 

Couldn't be bothered making new pic

 

guys thanks for the info.

It appears that when I was rebuilding the TPI I made a false connection. I disconnected the switch cleaned the terminals and reconnected, everything is working fine now.