Another Q-Jet question

[Justin Fleming]

my 86 k5 q-jet has the ECM fuel enrichment two wire device at the passenger front side of carb. It appears one wire goes back to the ECM and one wire goes to what I would guess to be a coolant temp switch in the thermostat hosing. This connection is a one wire connection. Can I test the switch some how for correct opperation?


Is there a procedure or a way to check to make sure the power enrichment is working correctly and shutting off when it is supposed to?

How can I test this?


Thanks

 

[Justin Fleming]

here is a clip from the article I was reading. I just need to figure out how to check the opperation:

To start this off, I just wanted to tell a little bit about the stock Q-jet that came on my truck (1985 C-10). 1985/86 Q-jets in U.S. trucks have dual capacity accelerator pumps. When the engine is cold, more fuel is needed for transition from idle to part-throttle. When the engine is warm, less fuel is required. Dual capacity pump solenoid (plug on top right front of carb) is activated by coolant temperature sensor (sensor in thermostat housing). At 170 degrees pump solenoid energizes, dual capacity pump valve opens and pump capacity reduces by about one-half.
[SIZE=-1]I had performed some of the mods in this article on my stock carb. After it started leaking around the air horn where it had been over-tightened at the carb mounting bolts, I decided to replace it with an Edelbrock Q-jet. The stock Q-jet is an emissions carb as most Q-jets in the early to mid 80's are. These carbs aren't computer controlled as many people think. The only thing electrical about them is the dual capacity pump. The carb has to be plugged to the sensor in the thermostat housing in order to work right. If it isn't, the pump solenoid will stay closed all the time and waste fuel.[/SIZE]

 

[Justin Fleming]

the only sense I can make out of this is that at 170 degrees the thermostat cooling switch should ring continuity to ground.