hey guys just pulley my plenum, runners, and rails and sent my injectors out for clening and flowmatching. while i have the rails out. how would i check proper operation of the cold start injector or what maintenece should be done in this area? how much are they to replace should i do that?

 

I have (had) a 1987 IROCZ L98 and deleted the cold start injector. It is not actually required, but it helps alot if you do not use it that you get a new chip burned with that in mind. Afterall, the '89s do not have cold start injectors.

 

im a little confused here i dont know all that much about the cold start circuit. i always thought that it acted as a choke for starting right away when the motor is cold. ????? i have a stock chip no money for a custom one now so i dont need the injector huh? why is it there then?

 

The cold start injector is a fuel injector, its main purpose is to add fuel during cranking (apparently for a rich start) when the engine is cold.

You dont need it if you take care of the extra fuel needed on a cold start by increasing the cranking PW vs coolant temp table.

As I said before, the MAFed '89 cars do not have a cold start injector.

 

The way I undestand it.. The cold start injector does add extra fuel during a cold start, but it does it alone. In the '89 MAF c ars, the computer tells ALL 8 injectors to add fuel at cold start. That is how the '89's get away without cold start.

To the point of you not needing the cold start. That is somewhat true, however, you would need to replace your chip with one that has '89 code on it. In other words, you would need to turn your car's computer into that of the computer from a 1989 car. Just replacing the chip, or reprogramming the chip will do that.

 

ok well i plan on keeping it on the car. so what kind of services can i do to the circuit to check proper operation? or cleaning? or what?

 

If you sent it out with the rest of the injectors for cleaning, then the only other item is the cold-start temp-switch (it uses the same connector as the fuel injectors) located to right of the coolant temp sensor on the front of the intake right above the timing chain cover.

To test with the engine cold; remove cold start injector from runner (do not disconnect from fuel rail) let it sit in a large jar and crank the engine you should see the injector spraying fuel into the jar.

 

you never told me what to do with the cold temp switch? and wouldnt the other injector ports in the rails spay everywere or were you saying to catch all the gas from the whole rail in a pan.

 

I just sent you a PM.